diff --git a/.github/workflows/docker-image.yml b/.github/workflows/docker-image.yml
index 9ccf3e8..ea94ec7 100644
--- a/.github/workflows/docker-image.yml
+++ b/.github/workflows/docker-image.yml
@@ -40,6 +40,8 @@ jobs:
       SPRING_DATASOURCE_USERNAME: ${{ secrets.SPRING_DATASOURCE_USERNAME }}
       SPRING_DATASOURCE_PASSWORD: ${{ secrets.SPRING_DATASOURCE_PASSWORD }}
       SPRING_PROFILES_ACTIVE: ${{ secrets.SPRING_PROFILES_ACTIVE }}
+      EMAIL_USERNAME: ${{ secrets.EMAIL_USERNAME }}
+      EMAIL_PASSWORD: ${{ secrets.EMAIL_PASSWORD }}
 
     steps:
       - name: Checkout code
@@ -108,3 +110,6 @@ jobs:
             ghcr.io/${{ env.IMAGE_REPO }}:${{ github.run_number }}
           cache-from: type=gha
           cache-to: type=gha,mode=max
+          build-args: |
+            EMAIL_USERNAME=${{ secrets.EMAIL_USERNAME }}
+            EMAIL_PASSWORD=${{ secrets.EMAIL_PASSWORD }}
\ No newline at end of file
diff --git a/Dockerfile b/Dockerfile
index 68b6119..f2676ca 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,4 +7,4 @@ FROM amazoncorretto:21
 WORKDIR /app
 COPY --from=build /app/target/*.jar app.jar
 EXPOSE 8080
-ENTRYPOINT ["java","-Dspring.profiles.active=prod", "-jar", "app.jar"]
+ENTRYPOINT ["java", "-jar", "app.jar"]
diff --git a/logs/app.log b/logs/app.log
index c19acaf..e69de29 100644
--- a/logs/app.log
+++ b/logs/app.log
@@ -1,1337 +0,0 @@
-2025-08-11 23:21:48 ERROR o.s.boot.SpringApplication - Application run failed
-org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [org.pkwmtt.PkwmttBackendApplication]
-	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:194)
-	at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:418)
-	at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:290)
-	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:349)
-	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:118)
-	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:791)
-	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:609)
-	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146)
-	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:752)
-	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:439)
-	at org.springframework.boot.SpringApplication.run(SpringApplication.java:318)
-	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1361)
-	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1350)
-	at org.pkwmtt.PkwmttBackendApplication.main(PkwmttBackendApplication.java:12)
-	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
-	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
-	at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:50)
-Caused by: java.lang.IllegalArgumentException: Could not find class [org.pkwmtt.timetable.TimetableController]
-	at org.springframework.util.ClassUtils.resolveClassName(ClassUtils.java:372)
-	at org.springframework.core.annotation.TypeMappedAnnotation.adapt(TypeMappedAnnotation.java:466)
-	at org.springframework.core.annotation.TypeMappedAnnotation.getValue(TypeMappedAnnotation.java:391)
-	at org.springframework.core.annotation.TypeMappedAnnotation.asMap(TypeMappedAnnotation.java:278)
-	at org.springframework.core.annotation.AbstractMergedAnnotation.asAnnotationAttributes(AbstractMergedAnnotation.java:191)
-	at org.springframework.context.annotation.AnnotationBeanNameGenerator.determineBeanNameFromAnnotation(AnnotationBeanNameGenerator.java:147)
-	at org.springframework.context.annotation.AnnotationBeanNameGenerator.generateBeanName(AnnotationBeanNameGenerator.java:113)
-	at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan(ClassPathBeanDefinitionScanner.java:281)
-	at org.springframework.context.annotation.ComponentScanAnnotationParser.parse(ComponentScanAnnotationParser.java:128)
-	at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:346)
-	at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:281)
-	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:204)
-	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:172)
-	... 16 common frames omitted
-Caused by: java.lang.ClassNotFoundException: org.pkwmtt.timetable.TimetableController
-	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
-	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
-	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526)
-	at java.base/java.lang.Class.forName0(Native Method)
-	at java.base/java.lang.Class.forName(Class.java:534)
-	at java.base/java.lang.Class.forName(Class.java:513)
-	at org.springframework.boot.devtools.restart.classloader.RestartClassLoader.loadClass(RestartClassLoader.java:121)
-	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526)
-	at java.base/java.lang.Class.forName0(Native Method)
-	at java.base/java.lang.Class.forName(Class.java:534)
-	at java.base/java.lang.Class.forName(Class.java:513)
-	at org.springframework.util.ClassUtils.forName(ClassUtils.java:321)
-	at org.springframework.util.ClassUtils.resolveClassName(ClassUtils.java:362)
-	... 28 common frames omitted
-2025-08-11 23:21:49 ERROR o.s.boot.SpringApplication - Application run failed
-org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [org.pkwmtt.PkwmttBackendApplication]
-	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:194)
-	at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:418)
-	at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:290)
-	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:349)
-	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:118)
-	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:791)
-	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:609)
-	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146)
-	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:752)
-	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:439)
-	at org.springframework.boot.SpringApplication.run(SpringApplication.java:318)
-	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1361)
-	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1350)
-	at org.pkwmtt.PkwmttBackendApplication.main(PkwmttBackendApplication.java:12)
-	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
-	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
-	at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:50)
-Caused by: java.lang.IllegalArgumentException: Could not find class [org.pkwmtt.timetable.TimetableController]
-	at org.springframework.util.ClassUtils.resolveClassName(ClassUtils.java:372)
-	at org.springframework.core.annotation.TypeMappedAnnotation.adapt(TypeMappedAnnotation.java:466)
-	at org.springframework.core.annotation.TypeMappedAnnotation.getValue(TypeMappedAnnotation.java:391)
-	at org.springframework.core.annotation.TypeMappedAnnotation.asMap(TypeMappedAnnotation.java:278)
-	at org.springframework.core.annotation.AbstractMergedAnnotation.asAnnotationAttributes(AbstractMergedAnnotation.java:191)
-	at org.springframework.context.annotation.AnnotationBeanNameGenerator.determineBeanNameFromAnnotation(AnnotationBeanNameGenerator.java:147)
-	at org.springframework.context.annotation.AnnotationBeanNameGenerator.generateBeanName(AnnotationBeanNameGenerator.java:113)
-	at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan(ClassPathBeanDefinitionScanner.java:281)
-	at org.springframework.context.annotation.ComponentScanAnnotationParser.parse(ComponentScanAnnotationParser.java:128)
-	at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:346)
-	at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:281)
-	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:204)
-	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:172)
-	... 16 common frames omitted
-Caused by: java.lang.ClassNotFoundException: org.pkwmtt.timetable.TimetableController
-	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
-	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
-	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526)
-	at java.base/java.lang.Class.forName0(Native Method)
-	at java.base/java.lang.Class.forName(Class.java:534)
-	at java.base/java.lang.Class.forName(Class.java:513)
-	at org.springframework.boot.devtools.restart.classloader.RestartClassLoader.loadClass(RestartClassLoader.java:121)
-	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526)
-	at java.base/java.lang.Class.forName0(Native Method)
-	at java.base/java.lang.Class.forName(Class.java:534)
-	at java.base/java.lang.Class.forName(Class.java:513)
-	at org.springframework.util.ClassUtils.forName(ClassUtils.java:321)
-	at org.springframework.util.ClassUtils.resolveClassName(ClassUtils.java:362)
-	... 28 common frames omitted
-2025-08-11 23:22:35 ERROR o.s.boot.SpringApplication - Application run failed
-org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [org.pkwmtt.PkwmttBackendApplication]
-	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:194)
-	at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:418)
-	at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:290)
-	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:349)
-	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:118)
-	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:791)
-	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:609)
-	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146)
-	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:752)
-	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:439)
-	at org.springframework.boot.SpringApplication.run(SpringApplication.java:318)
-	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1361)
-	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1350)
-	at org.pkwmtt.PkwmttBackendApplication.main(PkwmttBackendApplication.java:12)
-	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
-	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
-	at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:50)
-Caused by: java.lang.IllegalArgumentException: Could not find class [org.pkwmtt.timetable.TimetableController]
-	at org.springframework.util.ClassUtils.resolveClassName(ClassUtils.java:372)
-	at org.springframework.core.annotation.TypeMappedAnnotation.adapt(TypeMappedAnnotation.java:466)
-	at org.springframework.core.annotation.TypeMappedAnnotation.getValue(TypeMappedAnnotation.java:391)
-	at org.springframework.core.annotation.TypeMappedAnnotation.asMap(TypeMappedAnnotation.java:278)
-	at org.springframework.core.annotation.AbstractMergedAnnotation.asAnnotationAttributes(AbstractMergedAnnotation.java:191)
-	at org.springframework.context.annotation.AnnotationBeanNameGenerator.determineBeanNameFromAnnotation(AnnotationBeanNameGenerator.java:147)
-	at org.springframework.context.annotation.AnnotationBeanNameGenerator.generateBeanName(AnnotationBeanNameGenerator.java:113)
-	at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan(ClassPathBeanDefinitionScanner.java:281)
-	at org.springframework.context.annotation.ComponentScanAnnotationParser.parse(ComponentScanAnnotationParser.java:128)
-	at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:346)
-	at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:281)
-	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:204)
-	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:172)
-	... 16 common frames omitted
-Caused by: java.lang.ClassNotFoundException: org.pkwmtt.timetable.TimetableController
-	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
-	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
-	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526)
-	at java.base/java.lang.Class.forName0(Native Method)
-	at java.base/java.lang.Class.forName(Class.java:534)
-	at java.base/java.lang.Class.forName(Class.java:513)
-	at org.springframework.boot.devtools.restart.classloader.RestartClassLoader.loadClass(RestartClassLoader.java:121)
-	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526)
-	at java.base/java.lang.Class.forName0(Native Method)
-	at java.base/java.lang.Class.forName(Class.java:534)
-	at java.base/java.lang.Class.forName(Class.java:513)
-	at org.springframework.util.ClassUtils.forName(ClassUtils.java:321)
-	at org.springframework.util.ClassUtils.resolveClassName(ClassUtils.java:362)
-	... 28 common frames omitted
-2025-08-11 23:25:54 ERROR o.s.boot.SpringApplication - Application run failed
-org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [org.pkwmtt.PkwmttBackendApplication]
-	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:194)
-	at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:418)
-	at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:290)
-	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:349)
-	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:118)
-	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:791)
-	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:609)
-	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146)
-	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:752)
-	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:439)
-	at org.springframework.boot.SpringApplication.run(SpringApplication.java:318)
-	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1361)
-	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1350)
-	at org.pkwmtt.PkwmttBackendApplication.main(PkwmttBackendApplication.java:12)
-	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
-	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
-	at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:50)
-Caused by: java.lang.IllegalArgumentException: Could not find class [org.pkwmtt.timetable.TimetableController]
-	at org.springframework.util.ClassUtils.resolveClassName(ClassUtils.java:372)
-	at org.springframework.core.annotation.TypeMappedAnnotation.adapt(TypeMappedAnnotation.java:466)
-	at org.springframework.core.annotation.TypeMappedAnnotation.getValue(TypeMappedAnnotation.java:391)
-	at org.springframework.core.annotation.TypeMappedAnnotation.asMap(TypeMappedAnnotation.java:278)
-	at org.springframework.core.annotation.AbstractMergedAnnotation.asAnnotationAttributes(AbstractMergedAnnotation.java:191)
-	at org.springframework.context.annotation.AnnotationBeanNameGenerator.determineBeanNameFromAnnotation(AnnotationBeanNameGenerator.java:147)
-	at org.springframework.context.annotation.AnnotationBeanNameGenerator.generateBeanName(AnnotationBeanNameGenerator.java:113)
-	at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan(ClassPathBeanDefinitionScanner.java:281)
-	at org.springframework.context.annotation.ComponentScanAnnotationParser.parse(ComponentScanAnnotationParser.java:128)
-	at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:346)
-	at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:281)
-	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:204)
-	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:172)
-	... 16 common frames omitted
-Caused by: java.lang.ClassNotFoundException: org.pkwmtt.timetable.TimetableController
-	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
-	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
-	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526)
-	at java.base/java.lang.Class.forName0(Native Method)
-	at java.base/java.lang.Class.forName(Class.java:534)
-	at java.base/java.lang.Class.forName(Class.java:513)
-	at org.springframework.boot.devtools.restart.classloader.RestartClassLoader.loadClass(RestartClassLoader.java:121)
-	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526)
-	at java.base/java.lang.Class.forName0(Native Method)
-	at java.base/java.lang.Class.forName(Class.java:534)
-	at java.base/java.lang.Class.forName(Class.java:513)
-	at org.springframework.util.ClassUtils.forName(ClassUtils.java:321)
-	at org.springframework.util.ClassUtils.resolveClassName(ClassUtils.java:362)
-	... 28 common frames omitted
-2025-08-11 23:26:11 ERROR o.a.c.c.C.[.[.[.[dispatcherServlet] - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed: java.lang.UnsupportedOperationException] with root cause
-java.lang.UnsupportedOperationException: null
-	at java.base/java.util.ImmutableCollections.uoe(ImmutableCollections.java:142)
-	at java.base/java.util.ImmutableCollections$AbstractImmutableList.sort(ImmutableCollections.java:263)
-	at java.base/java.util.Collections.sort(Collections.java:145)
-	at org.pkwmtt.timetable.TimetableController.getListOfGeneralGroups(TimetableController.java:62)
-	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
-	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
-	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:258)
-	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:191)
-	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:118)
-	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:986)
-	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:891)
-	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
-	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1089)
-	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:979)
-	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014)
-	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:903)
-	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:564)
-	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885)
-	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:195)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:108)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:108)
-	at org.springframework.security.web.FilterChainProxy.lambda$doFilterInternal$3(FilterChainProxy.java:231)
-	at org.springframework.security.web.ObservationFilterChainDecorator$FilterObservation$SimpleFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:479)
-	at org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:340)
-	at org.springframework.security.web.ObservationFilterChainDecorator.lambda$wrapSecured$0(ObservationFilterChainDecorator.java:82)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:128)
-	at org.springframework.security.web.access.intercept.AuthorizationFilter.doFilter(AuthorizationFilter.java:101)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:125)
-	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:119)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:131)
-	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:85)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:100)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:179)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:107)
-	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:93)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:91)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90)
-	at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.context.SecurityContextHolderFilter.doFilter(SecurityContextHolderFilter.java:82)
-	at org.springframework.security.web.context.SecurityContextHolderFilter.doFilter(SecurityContextHolderFilter.java:69)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:62)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.session.DisableEncodeUrlFilter.doFilterInternal(DisableEncodeUrlFilter.java:42)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$0(ObservationFilterChainDecorator.java:323)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:224)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:233)
-	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:191)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.filter.ServletRequestPathFilter.doFilter(ServletRequestPathFilter.java:52)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.filter.CompositeFilter.doFilter(CompositeFilter.java:74)
-	at org.springframework.security.config.annotation.web.configuration.WebSecurityConfiguration$CompositeFilterChainProxy.doFilter(WebSecurityConfiguration.java:319)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.servlet.handler.HandlerMappingIntrospector.lambda$createCacheFilter$4(HandlerMappingIntrospector.java:267)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.filter.CompositeFilter.doFilter(CompositeFilter.java:74)
-	at org.springframework.security.config.annotation.web.configuration.WebMvcSecurityConfiguration$CompositeFilterChainProxy.doFilter(WebMvcSecurityConfiguration.java:240)
-	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:362)
-	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:278)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.ServerHttpObservationFilter.doFilterInternal(ServerHttpObservationFilter.java:114)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167)
-	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90)
-	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:483)
-	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:116)
-	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93)
-	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
-	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344)
-	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:398)
-	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
-	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:903)
-	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1769)
-	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
-	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1189)
-	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:658)
-	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63)
-	at java.base/java.lang.Thread.run(Thread.java:1583)
-2025-08-11 23:28:21 ERROR o.a.c.c.C.[.[.[.[dispatcherServlet] - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed: java.lang.UnsupportedOperationException] with root cause
-java.lang.UnsupportedOperationException: null
-	at java.base/java.util.ImmutableCollections.uoe(ImmutableCollections.java:142)
-	at java.base/java.util.ImmutableCollections$AbstractImmutableList.sort(ImmutableCollections.java:263)
-	at java.base/java.util.Collections.sort(Collections.java:145)
-	at org.pkwmtt.timetable.TimetableController.getListOfGeneralGroups(TimetableController.java:62)
-	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
-	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
-	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:258)
-	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:191)
-	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:118)
-	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:986)
-	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:891)
-	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
-	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1089)
-	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:979)
-	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014)
-	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:903)
-	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:564)
-	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885)
-	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:195)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:108)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:108)
-	at org.springframework.security.web.FilterChainProxy.lambda$doFilterInternal$3(FilterChainProxy.java:231)
-	at org.springframework.security.web.ObservationFilterChainDecorator$FilterObservation$SimpleFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:479)
-	at org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:340)
-	at org.springframework.security.web.ObservationFilterChainDecorator.lambda$wrapSecured$0(ObservationFilterChainDecorator.java:82)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:128)
-	at org.springframework.security.web.access.intercept.AuthorizationFilter.doFilter(AuthorizationFilter.java:101)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:125)
-	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:119)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:131)
-	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:85)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:100)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:179)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:107)
-	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:93)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:91)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90)
-	at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.context.SecurityContextHolderFilter.doFilter(SecurityContextHolderFilter.java:82)
-	at org.springframework.security.web.context.SecurityContextHolderFilter.doFilter(SecurityContextHolderFilter.java:69)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:62)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.session.DisableEncodeUrlFilter.doFilterInternal(DisableEncodeUrlFilter.java:42)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$0(ObservationFilterChainDecorator.java:323)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:224)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:233)
-	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:191)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.filter.ServletRequestPathFilter.doFilter(ServletRequestPathFilter.java:52)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.filter.CompositeFilter.doFilter(CompositeFilter.java:74)
-	at org.springframework.security.config.annotation.web.configuration.WebSecurityConfiguration$CompositeFilterChainProxy.doFilter(WebSecurityConfiguration.java:319)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.servlet.handler.HandlerMappingIntrospector.lambda$createCacheFilter$4(HandlerMappingIntrospector.java:267)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.filter.CompositeFilter.doFilter(CompositeFilter.java:74)
-	at org.springframework.security.config.annotation.web.configuration.WebMvcSecurityConfiguration$CompositeFilterChainProxy.doFilter(WebMvcSecurityConfiguration.java:240)
-	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:362)
-	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:278)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.ServerHttpObservationFilter.doFilterInternal(ServerHttpObservationFilter.java:114)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167)
-	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90)
-	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:483)
-	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:116)
-	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93)
-	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
-	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344)
-	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:398)
-	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
-	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:903)
-	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1769)
-	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
-	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1189)
-	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:658)
-	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63)
-	at java.base/java.lang.Thread.run(Thread.java:1583)
-2025-08-11 23:29:24 ERROR o.a.c.c.C.[.[.[.[dispatcherServlet] - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed: java.lang.UnsupportedOperationException] with root cause
-java.lang.UnsupportedOperationException: null
-	at java.base/java.util.ImmutableCollections.uoe(ImmutableCollections.java:142)
-	at java.base/java.util.ImmutableCollections$AbstractImmutableList.sort(ImmutableCollections.java:263)
-	at java.base/java.util.Collections.sort(Collections.java:145)
-	at org.pkwmtt.timetable.TimetableController.getListOfGeneralGroups(TimetableController.java:62)
-	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
-	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
-	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:258)
-	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:191)
-	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:118)
-	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:986)
-	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:891)
-	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
-	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1089)
-	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:979)
-	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014)
-	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:903)
-	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:564)
-	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885)
-	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:195)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:108)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:108)
-	at org.springframework.security.web.FilterChainProxy.lambda$doFilterInternal$3(FilterChainProxy.java:231)
-	at org.springframework.security.web.ObservationFilterChainDecorator$FilterObservation$SimpleFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:479)
-	at org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:340)
-	at org.springframework.security.web.ObservationFilterChainDecorator.lambda$wrapSecured$0(ObservationFilterChainDecorator.java:82)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:128)
-	at org.springframework.security.web.access.intercept.AuthorizationFilter.doFilter(AuthorizationFilter.java:101)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:125)
-	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:119)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:131)
-	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:85)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:100)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:179)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:107)
-	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:93)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:91)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90)
-	at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.context.SecurityContextHolderFilter.doFilter(SecurityContextHolderFilter.java:82)
-	at org.springframework.security.web.context.SecurityContextHolderFilter.doFilter(SecurityContextHolderFilter.java:69)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:62)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.session.DisableEncodeUrlFilter.doFilterInternal(DisableEncodeUrlFilter.java:42)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$0(ObservationFilterChainDecorator.java:323)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:224)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:233)
-	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:191)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.filter.ServletRequestPathFilter.doFilter(ServletRequestPathFilter.java:52)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.filter.CompositeFilter.doFilter(CompositeFilter.java:74)
-	at org.springframework.security.config.annotation.web.configuration.WebSecurityConfiguration$CompositeFilterChainProxy.doFilter(WebSecurityConfiguration.java:319)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.servlet.handler.HandlerMappingIntrospector.lambda$createCacheFilter$4(HandlerMappingIntrospector.java:267)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.filter.CompositeFilter.doFilter(CompositeFilter.java:74)
-	at org.springframework.security.config.annotation.web.configuration.WebMvcSecurityConfiguration$CompositeFilterChainProxy.doFilter(WebMvcSecurityConfiguration.java:240)
-	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:362)
-	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:278)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.ServerHttpObservationFilter.doFilterInternal(ServerHttpObservationFilter.java:114)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167)
-	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90)
-	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:483)
-	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:116)
-	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93)
-	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
-	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344)
-	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:398)
-	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
-	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:903)
-	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1769)
-	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
-	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1189)
-	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:658)
-	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63)
-	at java.base/java.lang.Thread.run(Thread.java:1583)
-2025-08-11 23:31:56 ERROR o.a.c.c.C.[.[.[.[dispatcherServlet] - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed: java.lang.UnsupportedOperationException] with root cause
-java.lang.UnsupportedOperationException: null
-	at java.base/java.util.ImmutableCollections.uoe(ImmutableCollections.java:142)
-	at java.base/java.util.ImmutableCollections$AbstractImmutableList.sort(ImmutableCollections.java:263)
-	at java.base/java.util.Collections.sort(Collections.java:145)
-	at org.pkwmtt.timetable.TimetableController.getListOfGeneralGroups(TimetableController.java:62)
-	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
-	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
-	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:258)
-	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:191)
-	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:118)
-	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:986)
-	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:891)
-	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
-	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1089)
-	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:979)
-	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014)
-	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:903)
-	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:564)
-	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885)
-	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:195)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:108)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:108)
-	at org.springframework.security.web.FilterChainProxy.lambda$doFilterInternal$3(FilterChainProxy.java:231)
-	at org.springframework.security.web.ObservationFilterChainDecorator$FilterObservation$SimpleFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:479)
-	at org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:340)
-	at org.springframework.security.web.ObservationFilterChainDecorator.lambda$wrapSecured$0(ObservationFilterChainDecorator.java:82)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:128)
-	at org.springframework.security.web.access.intercept.AuthorizationFilter.doFilter(AuthorizationFilter.java:101)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:125)
-	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:119)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:131)
-	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:85)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:100)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:179)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:107)
-	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:93)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:91)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90)
-	at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.context.SecurityContextHolderFilter.doFilter(SecurityContextHolderFilter.java:82)
-	at org.springframework.security.web.context.SecurityContextHolderFilter.doFilter(SecurityContextHolderFilter.java:69)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:62)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.session.DisableEncodeUrlFilter.doFilterInternal(DisableEncodeUrlFilter.java:42)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$0(ObservationFilterChainDecorator.java:323)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:224)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:233)
-	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:191)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.filter.ServletRequestPathFilter.doFilter(ServletRequestPathFilter.java:52)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.filter.CompositeFilter.doFilter(CompositeFilter.java:74)
-	at org.springframework.security.config.annotation.web.configuration.WebSecurityConfiguration$CompositeFilterChainProxy.doFilter(WebSecurityConfiguration.java:319)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.servlet.handler.HandlerMappingIntrospector.lambda$createCacheFilter$4(HandlerMappingIntrospector.java:267)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.filter.CompositeFilter.doFilter(CompositeFilter.java:74)
-	at org.springframework.security.config.annotation.web.configuration.WebMvcSecurityConfiguration$CompositeFilterChainProxy.doFilter(WebMvcSecurityConfiguration.java:240)
-	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:362)
-	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:278)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.ServerHttpObservationFilter.doFilterInternal(ServerHttpObservationFilter.java:114)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167)
-	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90)
-	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:483)
-	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:116)
-	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93)
-	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
-	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344)
-	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:398)
-	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
-	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:903)
-	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1769)
-	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
-	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1189)
-	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:658)
-	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63)
-	at java.base/java.lang.Thread.run(Thread.java:1583)
-2025-08-11 23:35:09 ERROR o.a.c.c.C.[.[.[.[dispatcherServlet] - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed: java.lang.UnsupportedOperationException] with root cause
-java.lang.UnsupportedOperationException: null
-	at java.base/java.util.ImmutableCollections.uoe(ImmutableCollections.java:142)
-	at java.base/java.util.ImmutableCollections$AbstractImmutableList.sort(ImmutableCollections.java:263)
-	at java.base/java.util.Collections.sort(Collections.java:145)
-	at org.pkwmtt.timetable.TimetableController.getListOfGeneralGroups(TimetableController.java:62)
-	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
-	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
-	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:258)
-	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:191)
-	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:118)
-	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:986)
-	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:891)
-	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
-	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1089)
-	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:979)
-	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014)
-	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:903)
-	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:564)
-	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885)
-	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:195)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:108)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:108)
-	at org.springframework.security.web.FilterChainProxy.lambda$doFilterInternal$3(FilterChainProxy.java:231)
-	at org.springframework.security.web.ObservationFilterChainDecorator$FilterObservation$SimpleFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:479)
-	at org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:340)
-	at org.springframework.security.web.ObservationFilterChainDecorator.lambda$wrapSecured$0(ObservationFilterChainDecorator.java:82)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:128)
-	at org.springframework.security.web.access.intercept.AuthorizationFilter.doFilter(AuthorizationFilter.java:101)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:125)
-	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:119)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:131)
-	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:85)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:100)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:179)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:107)
-	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:93)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:91)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90)
-	at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.context.SecurityContextHolderFilter.doFilter(SecurityContextHolderFilter.java:82)
-	at org.springframework.security.web.context.SecurityContextHolderFilter.doFilter(SecurityContextHolderFilter.java:69)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:62)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.session.DisableEncodeUrlFilter.doFilterInternal(DisableEncodeUrlFilter.java:42)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$0(ObservationFilterChainDecorator.java:323)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:224)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:233)
-	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:191)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.filter.ServletRequestPathFilter.doFilter(ServletRequestPathFilter.java:52)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.filter.CompositeFilter.doFilter(CompositeFilter.java:74)
-	at org.springframework.security.config.annotation.web.configuration.WebSecurityConfiguration$CompositeFilterChainProxy.doFilter(WebSecurityConfiguration.java:319)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.servlet.handler.HandlerMappingIntrospector.lambda$createCacheFilter$4(HandlerMappingIntrospector.java:267)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.filter.CompositeFilter.doFilter(CompositeFilter.java:74)
-	at org.springframework.security.config.annotation.web.configuration.WebMvcSecurityConfiguration$CompositeFilterChainProxy.doFilter(WebMvcSecurityConfiguration.java:240)
-	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:362)
-	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:278)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.ServerHttpObservationFilter.doFilterInternal(ServerHttpObservationFilter.java:114)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167)
-	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90)
-	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:483)
-	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:116)
-	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93)
-	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
-	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344)
-	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:398)
-	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
-	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:903)
-	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1769)
-	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
-	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1189)
-	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:658)
-	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63)
-	at java.base/java.lang.Thread.run(Thread.java:1583)
-2025-08-11 23:36:21 ERROR o.a.c.c.C.[.[.[.[dispatcherServlet] - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed: java.lang.UnsupportedOperationException] with root cause
-java.lang.UnsupportedOperationException: null
-	at java.base/java.util.ImmutableCollections.uoe(ImmutableCollections.java:142)
-	at java.base/java.util.ImmutableCollections$AbstractImmutableList.sort(ImmutableCollections.java:263)
-	at java.base/java.util.Collections.sort(Collections.java:145)
-	at org.pkwmtt.timetable.TimetableController.getListOfGeneralGroups(TimetableController.java:62)
-	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
-	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
-	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:258)
-	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:191)
-	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:118)
-	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:986)
-	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:891)
-	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
-	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1089)
-	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:979)
-	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014)
-	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:903)
-	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:564)
-	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885)
-	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:195)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:108)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:108)
-	at org.springframework.security.web.FilterChainProxy.lambda$doFilterInternal$3(FilterChainProxy.java:231)
-	at org.springframework.security.web.ObservationFilterChainDecorator$FilterObservation$SimpleFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:479)
-	at org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:340)
-	at org.springframework.security.web.ObservationFilterChainDecorator.lambda$wrapSecured$0(ObservationFilterChainDecorator.java:82)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:128)
-	at org.springframework.security.web.access.intercept.AuthorizationFilter.doFilter(AuthorizationFilter.java:101)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:125)
-	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:119)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:131)
-	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:85)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:100)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:179)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:107)
-	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:93)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:91)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90)
-	at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.context.SecurityContextHolderFilter.doFilter(SecurityContextHolderFilter.java:82)
-	at org.springframework.security.web.context.SecurityContextHolderFilter.doFilter(SecurityContextHolderFilter.java:69)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:62)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.session.DisableEncodeUrlFilter.doFilterInternal(DisableEncodeUrlFilter.java:42)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$0(ObservationFilterChainDecorator.java:323)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:224)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:233)
-	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:191)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.filter.ServletRequestPathFilter.doFilter(ServletRequestPathFilter.java:52)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.filter.CompositeFilter.doFilter(CompositeFilter.java:74)
-	at org.springframework.security.config.annotation.web.configuration.WebSecurityConfiguration$CompositeFilterChainProxy.doFilter(WebSecurityConfiguration.java:319)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.servlet.handler.HandlerMappingIntrospector.lambda$createCacheFilter$4(HandlerMappingIntrospector.java:267)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.filter.CompositeFilter.doFilter(CompositeFilter.java:74)
-	at org.springframework.security.config.annotation.web.configuration.WebMvcSecurityConfiguration$CompositeFilterChainProxy.doFilter(WebMvcSecurityConfiguration.java:240)
-	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:362)
-	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:278)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.ServerHttpObservationFilter.doFilterInternal(ServerHttpObservationFilter.java:114)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167)
-	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90)
-	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:483)
-	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:116)
-	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93)
-	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
-	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344)
-	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:398)
-	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
-	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:903)
-	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1769)
-	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
-	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1189)
-	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:658)
-	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63)
-	at java.base/java.lang.Thread.run(Thread.java:1583)
-2025-08-11 23:41:23 ERROR o.s.b.d.LoggingFailureAnalysisReporter - 
-
-***************************
-APPLICATION FAILED TO START
-***************************
-
-Description:
-
-Parameter 0 of constructor in org.pkwmtt.temp.CacheInspectorController required a bean of type 'org.pkwmtt.timetable.TimetableService' that could not be found.
-
-
-Action:
-
-Consider defining a bean of type 'org.pkwmtt.timetable.TimetableService' in your configuration.
-
-2025-08-11 23:58:48 ERROR o.a.c.c.C.[.[.[.[dispatcherServlet] - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed: org.pkwmtt.exceptions.SpecifiedSubGroupDoesntExistsException: Specified general group doesn't exists] with root cause
-org.pkwmtt.exceptions.SpecifiedSubGroupDoesntExistsException: Specified general group doesn't exists
-	at org.pkwmtt.timetable.TimetableService.getFilteredGeneralGroupSchedule(TimetableService.java:84)
-	at org.pkwmtt.timetable.TimetableController.getGeneralGroupSchedule(TimetableController.java:39)
-	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
-	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
-	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:258)
-	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:191)
-	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:118)
-	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:986)
-	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:891)
-	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
-	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1089)
-	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:979)
-	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014)
-	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:903)
-	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:564)
-	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885)
-	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:195)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:108)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:108)
-	at org.springframework.security.web.FilterChainProxy.lambda$doFilterInternal$3(FilterChainProxy.java:231)
-	at org.springframework.security.web.ObservationFilterChainDecorator$FilterObservation$SimpleFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:479)
-	at org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:340)
-	at org.springframework.security.web.ObservationFilterChainDecorator.lambda$wrapSecured$0(ObservationFilterChainDecorator.java:82)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:128)
-	at org.springframework.security.web.access.intercept.AuthorizationFilter.doFilter(AuthorizationFilter.java:101)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:125)
-	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:119)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:131)
-	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:85)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:100)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:179)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:107)
-	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:93)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:91)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90)
-	at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.context.SecurityContextHolderFilter.doFilter(SecurityContextHolderFilter.java:82)
-	at org.springframework.security.web.context.SecurityContextHolderFilter.doFilter(SecurityContextHolderFilter.java:69)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:62)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.session.DisableEncodeUrlFilter.doFilterInternal(DisableEncodeUrlFilter.java:42)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240)
-	at org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$0(ObservationFilterChainDecorator.java:323)
-	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:224)
-	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137)
-	at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:233)
-	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:191)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.filter.ServletRequestPathFilter.doFilter(ServletRequestPathFilter.java:52)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.filter.CompositeFilter.doFilter(CompositeFilter.java:74)
-	at org.springframework.security.config.annotation.web.configuration.WebSecurityConfiguration$CompositeFilterChainProxy.doFilter(WebSecurityConfiguration.java:319)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.servlet.handler.HandlerMappingIntrospector.lambda$createCacheFilter$4(HandlerMappingIntrospector.java:267)
-	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)
-	at org.springframework.web.filter.CompositeFilter.doFilter(CompositeFilter.java:74)
-	at org.springframework.security.config.annotation.web.configuration.WebMvcSecurityConfiguration$CompositeFilterChainProxy.doFilter(WebMvcSecurityConfiguration.java:240)
-	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:362)
-	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:278)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.ServerHttpObservationFilter.doFilterInternal(ServerHttpObservationFilter.java:114)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
-	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
-	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
-	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
-	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167)
-	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90)
-	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:483)
-	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:116)
-	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93)
-	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
-	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344)
-	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:398)
-	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
-	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:903)
-	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1769)
-	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
-	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1189)
-	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:658)
-	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63)
-	at java.base/java.lang.Thread.run(Thread.java:1583)
-2025-08-12 00:14:42 ERROR o.s.boot.SpringApplication - Application run failed
-org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [org.pkwmtt.PkwmttBackendApplication]
-	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:194)
-	at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:418)
-	at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:290)
-	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:349)
-	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:118)
-	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:791)
-	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:609)
-	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146)
-	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:752)
-	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:439)
-	at org.springframework.boot.SpringApplication.run(SpringApplication.java:318)
-	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1361)
-	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1350)
-	at org.pkwmtt.PkwmttBackendApplication.main(PkwmttBackendApplication.java:12)
-	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
-	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
-	at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:50)
-Caused by: java.lang.IllegalArgumentException: Could not find class [org.pkwmtt.timetable.TimetableController]
-	at org.springframework.util.ClassUtils.resolveClassName(ClassUtils.java:372)
-	at org.springframework.core.annotation.TypeMappedAnnotation.adapt(TypeMappedAnnotation.java:466)
-	at org.springframework.core.annotation.TypeMappedAnnotation.getValue(TypeMappedAnnotation.java:391)
-	at org.springframework.core.annotation.TypeMappedAnnotation.asMap(TypeMappedAnnotation.java:278)
-	at org.springframework.core.annotation.AbstractMergedAnnotation.asAnnotationAttributes(AbstractMergedAnnotation.java:191)
-	at org.springframework.context.annotation.AnnotationBeanNameGenerator.determineBeanNameFromAnnotation(AnnotationBeanNameGenerator.java:147)
-	at org.springframework.context.annotation.AnnotationBeanNameGenerator.generateBeanName(AnnotationBeanNameGenerator.java:113)
-	at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan(ClassPathBeanDefinitionScanner.java:281)
-	at org.springframework.context.annotation.ComponentScanAnnotationParser.parse(ComponentScanAnnotationParser.java:128)
-	at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:346)
-	at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:281)
-	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:204)
-	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:172)
-	... 16 common frames omitted
-Caused by: java.lang.ClassNotFoundException: org.pkwmtt.timetable.TimetableController
-	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
-	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
-	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526)
-	at java.base/java.lang.Class.forName0(Native Method)
-	at java.base/java.lang.Class.forName(Class.java:534)
-	at java.base/java.lang.Class.forName(Class.java:513)
-	at org.springframework.boot.devtools.restart.classloader.RestartClassLoader.loadClass(RestartClassLoader.java:121)
-	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526)
-	at java.base/java.lang.Class.forName0(Native Method)
-	at java.base/java.lang.Class.forName(Class.java:534)
-	at java.base/java.lang.Class.forName(Class.java:513)
-	at org.springframework.util.ClassUtils.forName(ClassUtils.java:321)
-	at org.springframework.util.ClassUtils.resolveClassName(ClassUtils.java:362)
-	... 28 common frames omitted
-2025-08-12 00:14:43 ERROR o.s.boot.SpringApplication - Application run failed
-org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [org.pkwmtt.PkwmttBackendApplication]
-	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:194)
-	at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:418)
-	at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:290)
-	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:349)
-	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:118)
-	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:791)
-	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:609)
-	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146)
-	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:752)
-	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:439)
-	at org.springframework.boot.SpringApplication.run(SpringApplication.java:318)
-	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1361)
-	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1350)
-	at org.pkwmtt.PkwmttBackendApplication.main(PkwmttBackendApplication.java:12)
-	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
-	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
-	at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:50)
-Caused by: java.lang.IllegalArgumentException: Could not find class [org.pkwmtt.timetable.TimetableController]
-	at org.springframework.util.ClassUtils.resolveClassName(ClassUtils.java:372)
-	at org.springframework.core.annotation.TypeMappedAnnotation.adapt(TypeMappedAnnotation.java:466)
-	at org.springframework.core.annotation.TypeMappedAnnotation.getValue(TypeMappedAnnotation.java:391)
-	at org.springframework.core.annotation.TypeMappedAnnotation.asMap(TypeMappedAnnotation.java:278)
-	at org.springframework.core.annotation.AbstractMergedAnnotation.asAnnotationAttributes(AbstractMergedAnnotation.java:191)
-	at org.springframework.context.annotation.AnnotationBeanNameGenerator.determineBeanNameFromAnnotation(AnnotationBeanNameGenerator.java:147)
-	at org.springframework.context.annotation.AnnotationBeanNameGenerator.generateBeanName(AnnotationBeanNameGenerator.java:113)
-	at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan(ClassPathBeanDefinitionScanner.java:281)
-	at org.springframework.context.annotation.ComponentScanAnnotationParser.parse(ComponentScanAnnotationParser.java:128)
-	at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:346)
-	at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:281)
-	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:204)
-	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:172)
-	... 16 common frames omitted
-Caused by: java.lang.ClassNotFoundException: org.pkwmtt.timetable.TimetableController
-	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
-	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
-	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526)
-	at java.base/java.lang.Class.forName0(Native Method)
-	at java.base/java.lang.Class.forName(Class.java:534)
-	at java.base/java.lang.Class.forName(Class.java:513)
-	at org.springframework.boot.devtools.restart.classloader.RestartClassLoader.loadClass(RestartClassLoader.java:121)
-	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526)
-	at java.base/java.lang.Class.forName0(Native Method)
-	at java.base/java.lang.Class.forName(Class.java:534)
-	at java.base/java.lang.Class.forName(Class.java:513)
-	at org.springframework.util.ClassUtils.forName(ClassUtils.java:321)
-	at org.springframework.util.ClassUtils.resolveClassName(ClassUtils.java:362)
-	... 28 common frames omitted
-2025-08-12 00:14:58 ERROR o.s.boot.SpringApplication - Application run failed
-org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [org.pkwmtt.PkwmttBackendApplication]
-	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:194)
-	at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:418)
-	at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:290)
-	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:349)
-	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:118)
-	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:791)
-	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:609)
-	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146)
-	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:752)
-	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:439)
-	at org.springframework.boot.SpringApplication.run(SpringApplication.java:318)
-	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1361)
-	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1350)
-	at org.pkwmtt.PkwmttBackendApplication.main(PkwmttBackendApplication.java:12)
-	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
-	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
-	at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:50)
-Caused by: java.lang.IllegalArgumentException: Could not find class [org.pkwmtt.timetable.TimetableController]
-	at org.springframework.util.ClassUtils.resolveClassName(ClassUtils.java:372)
-	at org.springframework.core.annotation.TypeMappedAnnotation.adapt(TypeMappedAnnotation.java:466)
-	at org.springframework.core.annotation.TypeMappedAnnotation.getValue(TypeMappedAnnotation.java:391)
-	at org.springframework.core.annotation.TypeMappedAnnotation.asMap(TypeMappedAnnotation.java:278)
-	at org.springframework.core.annotation.AbstractMergedAnnotation.asAnnotationAttributes(AbstractMergedAnnotation.java:191)
-	at org.springframework.context.annotation.AnnotationBeanNameGenerator.determineBeanNameFromAnnotation(AnnotationBeanNameGenerator.java:147)
-	at org.springframework.context.annotation.AnnotationBeanNameGenerator.generateBeanName(AnnotationBeanNameGenerator.java:113)
-	at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan(ClassPathBeanDefinitionScanner.java:281)
-	at org.springframework.context.annotation.ComponentScanAnnotationParser.parse(ComponentScanAnnotationParser.java:128)
-	at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:346)
-	at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:281)
-	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:204)
-	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:172)
-	... 16 common frames omitted
-Caused by: java.lang.ClassNotFoundException: org.pkwmtt.timetable.TimetableController
-	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
-	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
-	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526)
-	at java.base/java.lang.Class.forName0(Native Method)
-	at java.base/java.lang.Class.forName(Class.java:534)
-	at java.base/java.lang.Class.forName(Class.java:513)
-	at org.springframework.boot.devtools.restart.classloader.RestartClassLoader.loadClass(RestartClassLoader.java:121)
-	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526)
-	at java.base/java.lang.Class.forName0(Native Method)
-	at java.base/java.lang.Class.forName(Class.java:534)
-	at java.base/java.lang.Class.forName(Class.java:513)
-	at org.springframework.util.ClassUtils.forName(ClassUtils.java:321)
-	at org.springframework.util.ClassUtils.resolveClassName(ClassUtils.java:362)
-	... 28 common frames omitted
-2025-08-12 00:15:10 ERROR o.p.t.TimetableExceptionHandler - SERVICE_UNAVAILABLE # Content of university webpage is not available right now.
-2025-08-12 00:15:10 ERROR o.p.t.TimetableExceptionHandler - SERVICE_UNAVAILABLE # Content of university webpage is not available right now.
-2025-08-12 00:15:10 ERROR o.p.t.TimetableExceptionHandler - SERVICE_UNAVAILABLE # Content of university webpage is not available right now.
-2025-08-12 00:16:07 ERROR o.p.t.TimetableExceptionHandler - SERVICE_UNAVAILABLE # Content of university webpage is not available right now.
-2025-08-12 00:16:07 ERROR o.p.t.TimetableExceptionHandler - SERVICE_UNAVAILABLE # Content of university webpage is not available right now.
-2025-08-12 00:16:07 ERROR o.p.t.TimetableExceptionHandler - SERVICE_UNAVAILABLE # Content of university webpage is not available right now.
-2025-08-12 00:16:42 ERROR o.p.t.TimetableExceptionHandler - SERVICE_UNAVAILABLE # Content of university webpage is not available right now.
-2025-08-12 00:16:56 ERROR o.p.t.TimetableExceptionHandler - SERVICE_UNAVAILABLE # Content of university webpage is not available right now.
diff --git a/pom.xml b/pom.xml
index 5b85e73..1ab2d6a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -12,7 +12,9 @@
     <artifactId>PKWMTT-backend</artifactId>
     <version>0.1.0-ALPHA</version>
     <name>PKWMTT-backend</name>
-    <description>PKWM App (Server) – timetable, exam calendar and ECTS calculator for students of Mechanical Engineering @ Cracow University of Technology </description>
+    <description>PKWM App (Server) – timetable, exam calendar and ECTS calculator for students of Mechanical Engineering
+        @ Cracow University of Technology
+    </description>
     <url>https://github.com/PKTTTeam/PKWMTT-backend</url>
     <licenses>
         <license>
@@ -147,6 +149,17 @@
             <artifactId>wiremock-spring-boot</artifactId>
             <version>3.10.0</version>
         </dependency>
+        <!--EMAIL-->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-mail</artifactId>
+        </dependency>
+        <!--.ENV-->
+        <dependency>
+            <groupId>io.github.cdimascio</groupId>
+            <artifactId>dotenv-java</artifactId>
+            <version>3.0.0</version>
+        </dependency>
     </dependencies>
     <build>
         <plugins>
diff --git a/src/main/java/org/pkwmtt/exceptions/MailServiceNotAvailableException.java b/src/main/java/org/pkwmtt/exceptions/MailServiceNotAvailableException.java
new file mode 100644
index 0000000..e5f98de
--- /dev/null
+++ b/src/main/java/org/pkwmtt/exceptions/MailServiceNotAvailableException.java
@@ -0,0 +1,9 @@
+package org.pkwmtt.exceptions;
+
+public class MailServiceNotAvailableException
+  extends RuntimeException {
+    public MailServiceNotAvailableException () {
+        super("Mail service is not available right now.");
+    }
+    
+}
diff --git a/src/main/java/org/pkwmtt/mail/EmailService.java b/src/main/java/org/pkwmtt/mail/EmailService.java
new file mode 100644
index 0000000..1174ec0
--- /dev/null
+++ b/src/main/java/org/pkwmtt/mail/EmailService.java
@@ -0,0 +1,46 @@
+package org.pkwmtt.mail;
+
+import jakarta.annotation.PostConstruct;
+import jakarta.mail.MessagingException;
+import jakarta.mail.internet.MimeMessage;
+import lombok.RequiredArgsConstructor;
+import org.pkwmtt.exceptions.MailServiceNotAvailableException;
+import org.pkwmtt.mail.config.MailConfig;
+import org.pkwmtt.mail.dto.MailDTO;
+import org.springframework.core.env.Environment;
+import org.springframework.mail.javamail.JavaMailSender;
+import org.springframework.mail.javamail.MimeMessageHelper;
+import org.springframework.stereotype.Service;
+
+@RequiredArgsConstructor
+@Service
+public class EmailService {
+    private final Environment environment;
+    
+    private final JavaMailSender mailSender;
+    
+    private String hostEmail;
+    
+    @PostConstruct
+    private void assignProperties () {
+        hostEmail = environment.getProperty("spring.mail.username");
+    }
+    
+    public void send (MailDTO mail) throws MessagingException, MailServiceNotAvailableException {
+        if (!MailConfig.isEnabled()) {
+            throw new MailServiceNotAvailableException();
+        }
+        
+        
+        MimeMessage message = mailSender.createMimeMessage();
+        MimeMessageHelper helper = new MimeMessageHelper(message, true, "UTF-8");
+        
+        helper.setFrom(hostEmail);
+        helper.setTo(mail.getRecipient());
+        helper.setText(mail.getDescription(), true);
+        helper.setSubject(mail.getTitle());
+        
+        mailSender.send(message);
+        
+    }
+}
diff --git a/src/main/java/org/pkwmtt/mail/EmailTempController.java b/src/main/java/org/pkwmtt/mail/EmailTempController.java
new file mode 100644
index 0000000..1048a19
--- /dev/null
+++ b/src/main/java/org/pkwmtt/mail/EmailTempController.java
@@ -0,0 +1,35 @@
+package org.pkwmtt.mail;
+
+import jakarta.mail.MessagingException;
+import lombok.RequiredArgsConstructor;
+import org.pkwmtt.exceptions.MailServiceNotAvailableException;
+import org.pkwmtt.exceptions.dto.ErrorResponseDTO;
+import org.pkwmtt.mail.dto.MailDTO;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+@RequiredArgsConstructor
+@RequestMapping("/mail")
+public class EmailTempController {
+    
+    private final EmailService service;
+    
+    @PostMapping
+    public void sendMail (@RequestParam(name = "r") String recipientEmailAddress)
+      throws MessagingException, MailServiceNotAvailableException {
+        service.send(new MailDTO()
+                       .setRecipient(recipientEmailAddress)
+                       .setDescription("TEST")
+                       .setTitle("TEST"));
+    }
+    
+    @ExceptionHandler(MailServiceNotAvailableException.class)
+    public ResponseEntity<ErrorResponseDTO> handle (Exception e) {
+        return new ResponseEntity<>(
+          new ErrorResponseDTO(e.getMessage()),
+                                    HttpStatus.SERVICE_UNAVAILABLE
+        );
+    }
+}
diff --git a/src/main/java/org/pkwmtt/mail/config/MailConfig.java b/src/main/java/org/pkwmtt/mail/config/MailConfig.java
new file mode 100644
index 0000000..595d744
--- /dev/null
+++ b/src/main/java/org/pkwmtt/mail/config/MailConfig.java
@@ -0,0 +1,57 @@
+package org.pkwmtt.mail.config;
+
+import jakarta.annotation.PostConstruct;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.env.Environment;
+import org.springframework.mail.javamail.JavaMailSender;
+import org.springframework.mail.javamail.JavaMailSenderImpl;
+
+import java.util.Properties;
+
+@Configuration
+@RequiredArgsConstructor
+public class MailConfig {
+    
+    @Getter
+    private static boolean enabled = true;
+    
+    private final Environment environment;
+    
+    private String username;
+    private String password;
+    
+    @PostConstruct
+    private void assignAndValidateProperties () {
+        username = environment.getProperty("spring.mail.username");
+        password = environment.getProperty("spring.mail.password");
+        
+        if (username == null || password == null || username.isEmpty() || password.isEmpty()) {
+            enabled = false;
+        }
+    }
+    
+    @Bean
+    public JavaMailSender javaMailSender () {
+        JavaMailSenderImpl mailSender = new JavaMailSenderImpl();
+        
+        if (!enabled) {
+            return mailSender;
+        }
+        
+        mailSender.setHost("smtp.gmail.com");
+        mailSender.setPort(587);
+        mailSender.setUsername(username);
+        mailSender.setPassword(password);
+        
+        Properties props = mailSender.getJavaMailProperties();
+        props.put("mail.transport.protocol", "smtp");
+        props.put("mail.smtp.auth", "true");
+        props.put("mail.smtp.starttls.enable", "true");
+        
+        return mailSender;
+    }
+    
+}
diff --git a/src/main/java/org/pkwmtt/mail/dto/MailDTO.java b/src/main/java/org/pkwmtt/mail/dto/MailDTO.java
new file mode 100644
index 0000000..215d774
--- /dev/null
+++ b/src/main/java/org/pkwmtt/mail/dto/MailDTO.java
@@ -0,0 +1,14 @@
+package org.pkwmtt.mail.dto;
+
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import lombok.experimental.Accessors;
+
+@Data
+@Accessors(chain = true)
+@NoArgsConstructor
+public class MailDTO {
+    private String recipient;
+    private String title;
+    private String description;
+}
diff --git a/src/main/java/org/pkwmtt/status/DatabaseStatusChecker.java b/src/main/java/org/pkwmtt/status/DatabaseStatusChecker.java
new file mode 100644
index 0000000..6af41a8
--- /dev/null
+++ b/src/main/java/org/pkwmtt/status/DatabaseStatusChecker.java
@@ -0,0 +1,26 @@
+package org.pkwmtt.status;
+
+
+import lombok.Getter;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import javax.sql.DataSource;
+import java.sql.SQLException;
+
+@Slf4j
+@Service
+public class DatabaseStatusChecker {
+    @Getter
+    private static boolean enabled = false;
+    
+    @Autowired
+    DatabaseStatusChecker (DataSource dataSource) {
+        try {
+            enabled = dataSource.getConnection().isValid(2);
+        } catch (SQLException e) {
+            log.error("Couldn't check database connection. Service will be unavailable");
+        }
+    }
+}
diff --git a/src/main/java/org/pkwmtt/status/SystemStatusCheckerService.java b/src/main/java/org/pkwmtt/status/SystemStatusCheckerService.java
new file mode 100644
index 0000000..e7a4731
--- /dev/null
+++ b/src/main/java/org/pkwmtt/status/SystemStatusCheckerService.java
@@ -0,0 +1,47 @@
+package org.pkwmtt.status;
+
+import jakarta.annotation.PostConstruct;
+import org.pkwmtt.mail.config.MailConfig;
+import org.pkwmtt.timetable.TimetableCacheService;
+import org.pkwmtt.timetable.TimetableService;
+import org.springframework.stereotype.Service;
+
+
+@Service
+public class SystemStatusCheckerService {
+    
+    private String mailingStatus;
+    private String databaseStatus;
+    private String cacheStatus;
+    private String timetableStatus;
+    
+    SystemStatusCheckerService () {
+        checkStatuses();
+    }
+    
+    @PostConstruct
+    private void checkStatuses () {
+        mailingStatus = assignStatus(MailConfig.isEnabled());
+        databaseStatus = assignStatus(DatabaseStatusChecker.isEnabled());
+        timetableStatus = assignStatus(TimetableService.isEnabled());
+        cacheStatus = assignStatus(TimetableCacheService.isCacheAvailable());
+    }
+    
+    public String getStatus () {
+        return String.format(
+          """
+             Server: ✅;
+             Services:
+                 Mail: %s
+                 Database: %s,
+                 Timetable: %s,
+                 Cache: %s
+            """, mailingStatus, databaseStatus, timetableStatus, cacheStatus
+        );
+    }
+    
+    
+    private String assignStatus (boolean condition) {
+        return condition ? "✅" : "❌";
+    }
+}
diff --git a/src/main/java/org/pkwmtt/status/SystemStatusController.java b/src/main/java/org/pkwmtt/status/SystemStatusController.java
new file mode 100644
index 0000000..dd055c1
--- /dev/null
+++ b/src/main/java/org/pkwmtt/status/SystemStatusController.java
@@ -0,0 +1,20 @@
+package org.pkwmtt.status;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/pkwmtt/system/status")
+@RequiredArgsConstructor
+public class SystemStatusController {
+    private final SystemStatusCheckerService service;
+    
+    @GetMapping
+    public ResponseEntity<String> getSystemStatus () {
+        return ResponseEntity.ok(service.getStatus());
+    }
+    
+}
diff --git a/src/main/java/org/pkwmtt/timetable/TimetableCacheService.java b/src/main/java/org/pkwmtt/timetable/TimetableCacheService.java
index 09ad1d1..6bd4861 100644
--- a/src/main/java/org/pkwmtt/timetable/TimetableCacheService.java
+++ b/src/main/java/org/pkwmtt/timetable/TimetableCacheService.java
@@ -3,6 +3,7 @@
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.core.type.TypeReference;
 import com.fasterxml.jackson.databind.ObjectMapper;
+import lombok.Getter;
 import org.jsoup.Jsoup;
 import org.pkwmtt.exceptions.SpecifiedGeneralGroupDoesntExistsException;
 import org.pkwmtt.exceptions.WebPageContentNotAvailableException;
@@ -23,23 +24,37 @@
 public class TimetableCacheService {
     private final TimetableParserService parser;
     private final ObjectMapper mapper;
-
     private final Cache cache;
-
+    
+    @Getter
+    private static boolean cacheAvailable = true;
+    
     @Value("${main.url:https://podzial.mech.pk.edu.pl/stacjonarne/html/}")
     private String mainUrl;
-
-    public TimetableCacheService (TimetableParserService parser, ObjectMapper mapper, CacheManager cacheManager)
-            throws IllegalAccessException {
+    
+    public TimetableCacheService (TimetableParserService parser, ObjectMapper mapper, CacheManager cacheManager) {
         this.parser = parser;
         this.mapper = mapper;
         cache = cacheManager.getCache("timetables");
-
+        
         if (isNull(cache)) {
-            throw new IllegalAccessException("Cache [timetables] not configured");
+            cacheAvailable = false;
         }
     }
-
+    
+    /**
+     * @return connection status
+     */
+    public static boolean isConnectionAvailable () {
+        try {
+            fetchData("https://podzial.mech.pk.edu.pl/stacjonarne/html/");
+            return true;
+        } catch (Exception e) {
+            System.out.println(e.getMessage());
+            return false;
+        }
+    }
+    
     /**
      * Fetches and parses the full timetable for a general group.
      *
@@ -48,32 +63,30 @@ public TimetableCacheService (TimetableParserService parser, ObjectMapper mapper
      * @throws WebPageContentNotAvailableException if remote content is unavailable
      */
     public TimetableDTO getGeneralGroupSchedule (String generalGroupName)
-            throws WebPageContentNotAvailableException, SpecifiedGeneralGroupDoesntExistsException {
+      throws WebPageContentNotAvailableException, SpecifiedGeneralGroupDoesntExistsException {
         var generalGroupList = getGeneralGroupsMap();
-
+        
         if (!generalGroupList.containsKey(generalGroupName)) {
             throw new SpecifiedGeneralGroupDoesntExistsException(generalGroupName);
         }
-
+        
         String groupUrl = generalGroupList.get(generalGroupName);
         String url = mainUrl + groupUrl;
         String cacheKey = "timetable_" + generalGroupName;
         var html = fetchData(url);
         String json = cache.get(
-              cacheKey,
-              () -> {
-                var timetableDTO =new TimetableDTO(
-                generalGroupName,
-                parser.parse(html));
-                return mapper.writeValueAsString(timetableDTO);
-            }
+          cacheKey, () -> {
+              var timetableDTO = new TimetableDTO(generalGroupName, parser.parse(html));
+              return mapper.writeValueAsString(timetableDTO);
+          }
         );
-
+        
         return getMappedValue(
-            json, cacheKey, cache, new TypeReference<>() {}
+          json, cacheKey, cache, new TypeReference<>() {
+          }
         );
     }
-
+    
     /**
      * Retrieves a mapping of general group names to their corresponding timetable URLs.
      *
@@ -84,40 +97,40 @@ public Map<String, String> getGeneralGroupsMap () throws WebPageContentNotAvaila
         var url = mainUrl + "lista.html";
         var html = fetchData(url);
         String json = cache.get(
-                "generalGroupMap",
-                () -> mapper.writeValueAsString(parser.parseGeneralGroups(html))
+          "generalGroupMap",
+          () -> mapper.writeValueAsString(parser.parseGeneralGroups(html))
         );
-
+        
         return getMappedValue(
-                json, "generalGroupList", cache, new TypeReference<>() {
-                }
+          json, "generalGroupList", cache, new TypeReference<>() {
+          }
         );
     }
-
+    
     /**
      * Retrieves the standard list of hour ranges used in the timetable.
      *
      * @return list of hour labels (e.g., 08:00–09:30)
      * @throws WebPageContentNotAvailableException if hour definition page can't be loaded
      */
-    public List<String>  getListOfHours () throws WebPageContentNotAvailableException {
+    public List<String> getListOfHours () throws WebPageContentNotAvailableException {
         String url = mainUrl + "plany/o25.html";
         String json = cache.get(
-                "hourList",
-                () -> mapper.writeValueAsString(parser.parseHours(fetchData(url)))
+          "hourList",
+          () -> mapper.writeValueAsString(parser.parseHours(fetchData(url)))
         );
-
+        
         List<String> result = getMappedValue(
-                json, "hourList", cache, new TypeReference<>() {
-                }
+          json, "hourList", cache, new TypeReference<>() {
+          }
         );
-
+        
         //Delete useless spaces
         result = result.stream().map(item -> item.replaceAll(" ", "")).toList();
-
+        
         return result;
     }
-
+    
     /**
      * @param json        - json representation of java object
      * @param key         - cache key
@@ -128,7 +141,7 @@ public List<String>  getListOfHours () throws WebPageContentNotAvailableExceptio
      * @throws WebPageContentNotAvailableException if there were trouble with fetching data
      */
     private <T> T getMappedValue (String json, String key, Cache cache, TypeReference<T> targetClass)
-            throws WebPageContentNotAvailableException {
+      throws WebPageContentNotAvailableException {
         try {
             return mapper.readValue(json, targetClass);
         } catch (JsonProcessingException e) {
@@ -136,18 +149,18 @@ private <T> T getMappedValue (String json, String key, Cache cache, TypeReferenc
             throw new WebPageContentNotAvailableException();
         }
     }
-
+    
     /**
      * @param url - url of webpage
      * @return html code of selected webpage
      * @throws WebPageContentNotAvailableException if there were trouble with fetching data
      */
-    private String fetchData (String url) throws WebPageContentNotAvailableException {
+    private static String fetchData (String url) throws WebPageContentNotAvailableException {
         try {
             return Jsoup.connect(url).get().html();
         } catch (IOException ioe) {
             throw new WebPageContentNotAvailableException();
         }
     }
-
+    
 }
diff --git a/src/main/java/org/pkwmtt/timetable/TimetableService.java b/src/main/java/org/pkwmtt/timetable/TimetableService.java
index c0e6ca3..849cd66 100644
--- a/src/main/java/org/pkwmtt/timetable/TimetableService.java
+++ b/src/main/java/org/pkwmtt/timetable/TimetableService.java
@@ -2,26 +2,36 @@
 
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import lombok.RequiredArgsConstructor;
+import lombok.Getter;
 import lombok.extern.slf4j.Slf4j;
 import org.pkwmtt.exceptions.SpecifiedGeneralGroupDoesntExistsException;
 import org.pkwmtt.exceptions.SpecifiedSubGroupDoesntExistsException;
 import org.pkwmtt.exceptions.WebPageContentNotAvailableException;
 import org.pkwmtt.timetable.dto.DayOfWeekDTO;
 import org.pkwmtt.timetable.dto.TimetableDTO;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 
-import java.util.*;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 import java.util.stream.Collectors;
 
 @Slf4j
 @Service
-@RequiredArgsConstructor
 public class TimetableService {
     private final TimetableCacheService cachedService;
     
+    @Getter
+    private static final boolean enabled = TimetableCacheService.isConnectionAvailable();
+    
+    @Autowired
+    TimetableService (TimetableCacheService cachedService) {
+        this.cachedService = cachedService;
+    }
+    
     /**
      * Parses the timetable JSON to extract subgroup identifiers like K01, P03, GL04 using regex.
      *
@@ -57,9 +67,7 @@ public List<String> getAvailableSubGroups (String generalGroupName)
             matchedGroups.add(text);
         }
         
-        return matchedGroups.stream()
-                .sorted()
-                .toList();
+        return matchedGroups.stream().sorted().toList();
     }
     
     
@@ -103,9 +111,12 @@ public TimetableDTO getFilteredGeneralGroupSchedule (String generalGroupName, Li
      * @return List of general group's names
      */
     public List<String> getGeneralGroupList () throws WebPageContentNotAvailableException {
-        return cachedService.getGeneralGroupsMap().keySet().stream()
-                .sorted()
-                .collect(Collectors.toList());
+        return cachedService
+          .getGeneralGroupsMap()
+          .keySet()
+          .stream()
+          .sorted()
+          .collect(Collectors.toList());
     }
     
 }
diff --git a/src/main/java/org/pkwmtt/timetable/dto/DayOfWeekDTO.java b/src/main/java/org/pkwmtt/timetable/dto/DayOfWeekDTO.java
index 5ab6438..53d581b 100644
--- a/src/main/java/org/pkwmtt/timetable/dto/DayOfWeekDTO.java
+++ b/src/main/java/org/pkwmtt/timetable/dto/DayOfWeekDTO.java
@@ -12,28 +12,28 @@ public class DayOfWeekDTO {
     private final String name;
     private List<SubjectDTO> odd;
     private List<SubjectDTO> even;
-
-    public DayOfWeekDTO(String name) {
+    
+    public DayOfWeekDTO (String name) {
         this.name = name;
         odd = new ArrayList<>();
         even = new ArrayList<>();
     }
-
-
-    public void add(SubjectDTO subjectDTO, boolean isNotOdd) {
+    
+    
+    public void add (SubjectDTO subjectDTO, boolean isNotOdd) {
         if (isNotOdd) {
             even.add(subjectDTO);
         } else {
             odd.add(subjectDTO);
         }
     }
-
-
-    public void deleteSubjectTypesFromNames() {
+    
+    
+    public void deleteSubjectTypesFromNames () {
         even.forEach(SubjectDTO::deleteTypeAndUnnecessaryCharactersFromName);
         odd.forEach(SubjectDTO::deleteTypeAndUnnecessaryCharactersFromName);
     }
-
+    
     /**
      * Filters both odd- and even-week subject lists,
      * keeping only those entries that belong exclusively
@@ -43,23 +43,24 @@ public void deleteSubjectTypesFromNames() {
      *              where the first character is the group letter
      *              and the last character is the subgroup number
      */
-    public void filterByGroup(String group) {
+    public void filterByGroup (String group) {
         // Delete first character if group starts 'G'
-        if (group.charAt(0) == 'G' && group.length() > 3)
+        if (group.charAt(0) == 'G' && group.length() > 3) {
             group = group.substring(1);
-
+        }
+        
         // Extract the group letter (e.g., "K" from "K03")
         var groupName = String.valueOf(group.charAt(0));
-
+        
         // Extract the subgroup digit (e.g., "3" from "K03")
         var targetNumber = String.valueOf(group.charAt(group.length() - 1));
-
+        
         // Apply the filter to both odd- and even-week lists
         odd = filter(odd, groupName, targetNumber);
         even = filter(even, groupName, targetNumber);
-
+        
     }
-
+    
     /**
      * Returns a new list containing only those SubjectDTO items
      * whose type string matches exclusively the target group code or doesn't have group at all.
@@ -69,22 +70,16 @@ public void filterByGroup(String group) {
      * @param targetNumber the subgroup digit to keep (e.g., "3")
      * @return a filtered list of SubjectDTO
      */
-    private List<SubjectDTO> filter(List<SubjectDTO> list, String groupName, String targetNumber) {
-
+    private List<SubjectDTO> filter (List<SubjectDTO> list, String groupName, String targetNumber) {
+        
         list = list.stream()
-            // Keep only items that have no other subgroup codes
-            .filter(
-                item ->
-                    hasOnlyTargetGroup(
-                        item.getName(),
-                        groupName,
-                        targetNumber
-                    )
-            ).toList();
-
+                   // Keep only items that have no other subgroup codes
+                   .filter(item -> hasOnlyTargetGroup(item.getName(), groupName, targetNumber))
+                   .toList();
+        
         return list;
     }
-
+    
     /**
      * Checks if the given element string contains no other codes for the same group.*
      *
@@ -93,15 +88,23 @@ private List<SubjectDTO> filter(List<SubjectDTO> list, String groupName, String
      * @param targetNumber the digit we want to allow (e.g., "3")
      * @return true if no non-target subgroup codes are present
      */
-    private boolean hasOnlyTargetGroup(String element, String groupName, String targetNumber) {
-        var pattern = Pattern.compile(String.format("\\bG?[%s]0[1-9]\\b", groupName));
+    private boolean hasOnlyTargetGroup (String element, String groupName, String targetNumber) {
+        var pattern = Pattern.compile(String.format(
+          "\\bG?[%s]0[1-9]\\b",
+          Pattern.quote(groupName)
+        ));
         var matcher = pattern.matcher(element);
-        if (!matcher.find())
+        if (!matcher.find()) {
             return true;
-
-        pattern = Pattern.compile(String.format("%s0%s", groupName, targetNumber));
+        }
+        
+        pattern = Pattern.compile(String.format(
+          "%s0%s",
+          Pattern.quote(groupName),
+          Pattern.quote(targetNumber)
+        ));
         matcher = pattern.matcher(element);
         return matcher.find();
     }
-
+    
 }
\ No newline at end of file
diff --git a/src/main/resources/application-prod.properties b/src/main/resources/application-prod.properties
index 567cfdb..cd609c7 100644
--- a/src/main/resources/application-prod.properties
+++ b/src/main/resources/application-prod.properties
@@ -3,7 +3,7 @@ spring.datasource.username=pkttuser
 spring.datasource.password=pkttpassword
 
 server.port=8080
-server.address=155.133.73.101
+server.address=0.0.0.0
 
 spring.jpa.show-sql=true
 spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL8Dialect
diff --git a/src/main/resources/application.properties b/src/main/resources/application.properties
index 4c1aef9..a227ab6 100644
--- a/src/main/resources/application.properties
+++ b/src/main/resources/application.properties
@@ -1,3 +1,6 @@
+#Import .env variables
+spring.config.import=optional:file:.env[.properties]
+
 spring.datasource.url=jdbc:mysql://localhost:3306/pktt?useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=UTC
 spring.datasource.username=pkttuser
 spring.datasource.password=pkttpassword
@@ -18,3 +21,9 @@ spring.cache.type=caffeine
 
 logging.level.WireMock.my-mock=off
 
+spring.mail.host=smtp.gmail.com
+spring.mail.port=587
+spring.mail.username=${EMAIL_USERNAME:}
+spring.mail.password=${EMAIL_PASSWORD:}
+spring.mail.properties.mail.smtp.auth=true
+spring.mail.properties.mail.smtp.starttls.enable=true