diff --git a/.gitignore b/.gitignore
index d6c382a8..d9058f9f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -27,3 +27,9 @@
 hs_err_pid*
 replay_pid*
 .idea/inspectionProfiles/Project_Default.xml
+
+# ignore asdf tool-versions
+.tool-versions
+
+# ignore intelij files
+.idea/*
diff --git a/.idea/compiler.xml b/.idea/compiler.xml
deleted file mode 100644
index 0dde0e25..00000000
--- a/.idea/compiler.xml
+++ /dev/null
@@ -1,13 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="CompilerConfiguration">
-    <annotationProcessing>
-      <profile name="Maven default annotation processors profile" enabled="true">
-        <sourceOutputDir name="target/generated-sources/annotations" />
-        <sourceTestOutputDir name="target/generated-test-sources/test-annotations" />
-        <outputRelativeToContentRoot value="true" />
-        <module name="reactive-example" />
-      </profile>
-    </annotationProcessing>
-  </component>
-</project>
\ No newline at end of file
diff --git a/.idea/dictionaries/javabrains.xml b/.idea/dictionaries/javabrains.xml
deleted file mode 100644
index b8878617..00000000
--- a/.idea/dictionaries/javabrains.xml
+++ /dev/null
@@ -1,3 +0,0 @@
-<component name="ProjectDictionaryState">
-  <dictionary name="javabrains" />
-</component>
\ No newline at end of file
diff --git a/.idea/inspectionProfiles/Project_Default.xml b/.idea/inspectionProfiles/Project_Default.xml
deleted file mode 100644
index 1ea6e016..00000000
--- a/.idea/inspectionProfiles/Project_Default.xml
+++ /dev/null
@@ -1,13 +0,0 @@
-<component name="InspectionProjectProfileManager">
-  <profile version="1.0">
-    <option name="myName" value="Project Default" />
-    <inspection_tool class="AndroidLintTypos" enabled="false" level="WARNING" enabled_by_default="false" />
-    <inspection_tool class="Convert2MethodRef" enabled="false" level="WARNING" enabled_by_default="false" />
-    <inspection_tool class="IgnoreResultOfCall" enabled="false" level="WARNING" enabled_by_default="false">
-      <option name="m_reportAllNonLibraryCalls" value="false" />
-      <option name="callCheckString" value="java.io.File,.*,java.io.InputStream,read|skip|available|markSupported,java.io.Reader,read|skip|ready|markSupported,java.lang.AbstractStringBuilder,capacity|codePointAt|codePointBefore|codePointCount|indexOf|lastIndexOf|offsetByCodePoints|substring|subSequence,java.lang.Boolean,.*,java.lang.Byte,.*,java.lang.Character,.*,java.lang.Double,.*,java.lang.Float,.*,java.lang.Integer,.*,java.lang.Long,.*,java.lang.Math,.*,java.lang.Object,equals|hashCode|toString,java.lang.Short,.*,java.lang.StrictMath,.*,java.lang.String,.*,java.lang.Thread,interrupted,java.math.BigDecimal,.*,java.math.BigInteger,.*,java.net.InetAddress,.*,java.net.URI,.*,java.nio.channels.AsynchronousChannelGroup,.*,java.util.Arrays,.*,java.util.Collections,(?!addAll).*,java.util.List,of,java.util.Map,of|ofEntries|entry,java.util.Set,of,java.util.UUID,.*,java.util.concurrent.BlockingQueue,offer|remove,java.util.concurrent.CountDownLatch,await|getCount,java.util.concurrent.ExecutorService,awaitTermination|isShutdown|isTerminated,java.util.concurrent.ForkJoinPool,awaitQuiescence,java.util.concurrent.Semaphore,tryAcquire|availablePermits|isFair|hasQueuedThreads|getQueueLength|getQueuedThreads,java.util.concurrent.locks.Condition,await|awaitNanos|awaitUntil,java.util.concurrent.locks.Lock,tryLock|newCondition,java.util.regex.Matcher,pattern|toMatchResult|start|end|group|groupCount|matches|find|lookingAt|quoteReplacement|replaceAll|replaceFirst|regionStart|regionEnd|hasTransparentBounds|hasAnchoringBounds|hitEnd|requireEnd,java.util.regex.Pattern,.*,java.util.stream.BaseStream,.*,java.util.stream.DoubleStream,.*,java.util.stream.IntStream,.*,java.util.stream.LongStream,.*,java.util.stream.Stream,.*" />
-    </inspection_tool>
-    <inspection_tool class="LambdaCanBeMethodCall" enabled="false" level="INFORMATION" enabled_by_default="false" />
-    <inspection_tool class="LanguageDetectionInspection" enabled="false" level="WARNING" enabled_by_default="false" />
-  </profile>
-</component>
\ No newline at end of file
diff --git a/.idea/jarRepositories.xml b/.idea/jarRepositories.xml
deleted file mode 100644
index 712ab9d9..00000000
--- a/.idea/jarRepositories.xml
+++ /dev/null
@@ -1,20 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="RemoteRepositoriesConfiguration">
-    <remote-repository>
-      <option name="id" value="central" />
-      <option name="name" value="Central Repository" />
-      <option name="url" value="https://repo.maven.apache.org/maven2" />
-    </remote-repository>
-    <remote-repository>
-      <option name="id" value="central" />
-      <option name="name" value="Maven Central repository" />
-      <option name="url" value="https://repo1.maven.org/maven2" />
-    </remote-repository>
-    <remote-repository>
-      <option name="id" value="jboss.community" />
-      <option name="name" value="JBoss Community repository" />
-      <option name="url" value="https://repository.jboss.org/nexus/content/repositories/public/" />
-    </remote-repository>
-  </component>
-</project>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
deleted file mode 100644
index 8013ad8b..00000000
--- a/.idea/misc.xml
+++ /dev/null
@@ -1,14 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ExternalStorageConfigurationManager" enabled="true" />
-  <component name="MavenProjectsManager">
-    <option name="originalFiles">
-      <list>
-        <option value="$PROJECT_DIR$/pom.xml" />
-      </list>
-    </option>
-  </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="openjdk-17 (2)" project-jdk-type="JavaSDK">
-    <output url="file://$PROJECT_DIR$/out" />
-  </component>
-</project>
\ No newline at end of file
diff --git a/.idea/uiDesigner.xml b/.idea/uiDesigner.xml
deleted file mode 100644
index e96534fb..00000000
--- a/.idea/uiDesigner.xml
+++ /dev/null
@@ -1,124 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="Palette2">
-    <group name="Swing">
-      <item class="com.intellij.uiDesigner.HSpacer" tooltip-text="Horizontal Spacer" icon="/com/intellij/uiDesigner/icons/hspacer.png" removable="false" auto-create-binding="false" can-attach-label="false">
-        <default-constraints vsize-policy="1" hsize-policy="6" anchor="0" fill="1" />
-      </item>
-      <item class="com.intellij.uiDesigner.VSpacer" tooltip-text="Vertical Spacer" icon="/com/intellij/uiDesigner/icons/vspacer.png" removable="false" auto-create-binding="false" can-attach-label="false">
-        <default-constraints vsize-policy="6" hsize-policy="1" anchor="0" fill="2" />
-      </item>
-      <item class="javax.swing.JPanel" icon="/com/intellij/uiDesigner/icons/panel.png" removable="false" auto-create-binding="false" can-attach-label="false">
-        <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3" />
-      </item>
-      <item class="javax.swing.JScrollPane" icon="/com/intellij/uiDesigner/icons/scrollPane.png" removable="false" auto-create-binding="false" can-attach-label="true">
-        <default-constraints vsize-policy="7" hsize-policy="7" anchor="0" fill="3" />
-      </item>
-      <item class="javax.swing.JButton" icon="/com/intellij/uiDesigner/icons/button.png" removable="false" auto-create-binding="true" can-attach-label="false">
-        <default-constraints vsize-policy="0" hsize-policy="3" anchor="0" fill="1" />
-        <initial-values>
-          <property name="text" value="Button" />
-        </initial-values>
-      </item>
-      <item class="javax.swing.JRadioButton" icon="/com/intellij/uiDesigner/icons/radioButton.png" removable="false" auto-create-binding="true" can-attach-label="false">
-        <default-constraints vsize-policy="0" hsize-policy="3" anchor="8" fill="0" />
-        <initial-values>
-          <property name="text" value="RadioButton" />
-        </initial-values>
-      </item>
-      <item class="javax.swing.JCheckBox" icon="/com/intellij/uiDesigner/icons/checkBox.png" removable="false" auto-create-binding="true" can-attach-label="false">
-        <default-constraints vsize-policy="0" hsize-policy="3" anchor="8" fill="0" />
-        <initial-values>
-          <property name="text" value="CheckBox" />
-        </initial-values>
-      </item>
-      <item class="javax.swing.JLabel" icon="/com/intellij/uiDesigner/icons/label.png" removable="false" auto-create-binding="false" can-attach-label="false">
-        <default-constraints vsize-policy="0" hsize-policy="0" anchor="8" fill="0" />
-        <initial-values>
-          <property name="text" value="Label" />
-        </initial-values>
-      </item>
-      <item class="javax.swing.JTextField" icon="/com/intellij/uiDesigner/icons/textField.png" removable="false" auto-create-binding="true" can-attach-label="true">
-        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
-          <preferred-size width="150" height="-1" />
-        </default-constraints>
-      </item>
-      <item class="javax.swing.JPasswordField" icon="/com/intellij/uiDesigner/icons/passwordField.png" removable="false" auto-create-binding="true" can-attach-label="true">
-        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
-          <preferred-size width="150" height="-1" />
-        </default-constraints>
-      </item>
-      <item class="javax.swing.JFormattedTextField" icon="/com/intellij/uiDesigner/icons/formattedTextField.png" removable="false" auto-create-binding="true" can-attach-label="true">
-        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
-          <preferred-size width="150" height="-1" />
-        </default-constraints>
-      </item>
-      <item class="javax.swing.JTextArea" icon="/com/intellij/uiDesigner/icons/textArea.png" removable="false" auto-create-binding="true" can-attach-label="true">
-        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
-          <preferred-size width="150" height="50" />
-        </default-constraints>
-      </item>
-      <item class="javax.swing.JTextPane" icon="/com/intellij/uiDesigner/icons/textPane.png" removable="false" auto-create-binding="true" can-attach-label="true">
-        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
-          <preferred-size width="150" height="50" />
-        </default-constraints>
-      </item>
-      <item class="javax.swing.JEditorPane" icon="/com/intellij/uiDesigner/icons/editorPane.png" removable="false" auto-create-binding="true" can-attach-label="true">
-        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
-          <preferred-size width="150" height="50" />
-        </default-constraints>
-      </item>
-      <item class="javax.swing.JComboBox" icon="/com/intellij/uiDesigner/icons/comboBox.png" removable="false" auto-create-binding="true" can-attach-label="true">
-        <default-constraints vsize-policy="0" hsize-policy="2" anchor="8" fill="1" />
-      </item>
-      <item class="javax.swing.JTable" icon="/com/intellij/uiDesigner/icons/table.png" removable="false" auto-create-binding="true" can-attach-label="false">
-        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
-          <preferred-size width="150" height="50" />
-        </default-constraints>
-      </item>
-      <item class="javax.swing.JList" icon="/com/intellij/uiDesigner/icons/list.png" removable="false" auto-create-binding="true" can-attach-label="false">
-        <default-constraints vsize-policy="6" hsize-policy="2" anchor="0" fill="3">
-          <preferred-size width="150" height="50" />
-        </default-constraints>
-      </item>
-      <item class="javax.swing.JTree" icon="/com/intellij/uiDesigner/icons/tree.png" removable="false" auto-create-binding="true" can-attach-label="false">
-        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
-          <preferred-size width="150" height="50" />
-        </default-constraints>
-      </item>
-      <item class="javax.swing.JTabbedPane" icon="/com/intellij/uiDesigner/icons/tabbedPane.png" removable="false" auto-create-binding="true" can-attach-label="false">
-        <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3">
-          <preferred-size width="200" height="200" />
-        </default-constraints>
-      </item>
-      <item class="javax.swing.JSplitPane" icon="/com/intellij/uiDesigner/icons/splitPane.png" removable="false" auto-create-binding="false" can-attach-label="false">
-        <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3">
-          <preferred-size width="200" height="200" />
-        </default-constraints>
-      </item>
-      <item class="javax.swing.JSpinner" icon="/com/intellij/uiDesigner/icons/spinner.png" removable="false" auto-create-binding="true" can-attach-label="true">
-        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1" />
-      </item>
-      <item class="javax.swing.JSlider" icon="/com/intellij/uiDesigner/icons/slider.png" removable="false" auto-create-binding="true" can-attach-label="false">
-        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1" />
-      </item>
-      <item class="javax.swing.JSeparator" icon="/com/intellij/uiDesigner/icons/separator.png" removable="false" auto-create-binding="false" can-attach-label="false">
-        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3" />
-      </item>
-      <item class="javax.swing.JProgressBar" icon="/com/intellij/uiDesigner/icons/progressbar.png" removable="false" auto-create-binding="true" can-attach-label="false">
-        <default-constraints vsize-policy="0" hsize-policy="6" anchor="0" fill="1" />
-      </item>
-      <item class="javax.swing.JToolBar" icon="/com/intellij/uiDesigner/icons/toolbar.png" removable="false" auto-create-binding="false" can-attach-label="false">
-        <default-constraints vsize-policy="0" hsize-policy="6" anchor="0" fill="1">
-          <preferred-size width="-1" height="20" />
-        </default-constraints>
-      </item>
-      <item class="javax.swing.JToolBar$Separator" icon="/com/intellij/uiDesigner/icons/toolbarSeparator.png" removable="false" auto-create-binding="false" can-attach-label="false">
-        <default-constraints vsize-policy="0" hsize-policy="0" anchor="0" fill="1" />
-      </item>
-      <item class="javax.swing.JScrollBar" icon="/com/intellij/uiDesigner/icons/scrollbar.png" removable="false" auto-create-binding="true" can-attach-label="false">
-        <default-constraints vsize-policy="6" hsize-policy="0" anchor="0" fill="2" />
-      </item>
-    </group>
-  </component>
-</project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
deleted file mode 100644
index 94a25f7f..00000000
--- a/.idea/vcs.xml
+++ /dev/null
@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="VcsDirectoryMappings">
-    <mapping directory="$PROJECT_DIR$" vcs="Git" />
-  </component>
-</project>
\ No newline at end of file
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
deleted file mode 100644
index 4c6785d0..00000000
--- a/.idea/workspace.xml
+++ /dev/null
@@ -1,173 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="AutoImportSettings">
-    <option name="autoReloadType" value="SELECTIVE" />
-  </component>
-  <component name="ChangeListManager">
-    <list default="true" id="684c8c37-4a27-4f62-9e94-e17cc2f8eb5e" name="Changes" comment="">
-      <change afterPath="$PROJECT_DIR$/.gitignore" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/.idea/compiler.xml" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/.idea/dictionaries/javabrains.xml" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/.idea/inspectionProfiles/Project_Default.xml" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/.idea/jarRepositories.xml" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/.idea/misc.xml" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/.idea/uiDesigner.xml" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/.idea/vcs.xml" afterDir="false" />
-    </list>
-    <option name="SHOW_DIALOG" value="false" />
-    <option name="HIGHLIGHT_CONFLICTS" value="true" />
-    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
-    <option name="LAST_RESOLUTION" value="IGNORE" />
-  </component>
-  <component name="FileTemplateManagerImpl">
-    <option name="RECENT_TEMPLATES">
-      <list>
-        <option value="Class" />
-      </list>
-    </option>
-  </component>
-  <component name="FormatOnSaveOptions">
-    <option name="myRunOnSave" value="true" />
-  </component>
-  <component name="Git.Settings">
-    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
-  </component>
-  <component name="GitSEFilterConfiguration">
-    <file-type-list>
-      <filtered-out-file-type name="LOCAL_BRANCH" />
-      <filtered-out-file-type name="REMOTE_BRANCH" />
-      <filtered-out-file-type name="TAG" />
-      <filtered-out-file-type name="COMMIT_BY_MESSAGE" />
-    </file-type-list>
-  </component>
-  <component name="MarkdownSettingsMigration">
-    <option name="stateVersion" value="1" />
-  </component>
-  <component name="OptimizeOnSaveOptions">
-    <option name="myRunOnSave" value="true" />
-  </component>
-  <component name="ProjectId" id="27vuubJ8YjgMH3yN1OLMmwH5r2f" />
-  <component name="ProjectLevelVcsManager" settingsEditedManually="true" />
-  <component name="ProjectViewState">
-    <option name="hideEmptyMiddlePackages" value="true" />
-    <option name="showLibraryContents" value="true" />
-  </component>
-  <component name="PropertiesComponent">
-    <property name="ASKED_SHARE_PROJECT_CONFIGURATION_FILES" value="true" />
-    <property name="RunOnceActivity.OpenProjectViewOnStart" value="true" />
-    <property name="RunOnceActivity.ShowReadmeOnStart" value="true" />
-    <property name="SHARE_PROJECT_CONFIGURATION_FILES" value="true" />
-    <property name="code.cleanup.on.save" value="true" />
-    <property name="full.screen.before.presentation.mode" value="true" />
-    <property name="last_directory_selection" value="$PROJECT_DIR$/src/main/java" />
-    <property name="last_opened_file_path" value="$PROJECT_DIR$" />
-    <property name="settings.editor.selected.configurable" value="preferences.general" />
-  </component>
-  <component name="RecentsManager">
-    <key name="CopyClassDialog.RECENTS_KEY">
-      <recent name="io.javabrains.reactiveworkshop" />
-    </key>
-  </component>
-  <component name="RunManager" selected="Application.Exercise1">
-    <configuration name="Exercise1" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
-      <option name="MAIN_CLASS_NAME" value="io.javabrains.reactiveworkshop.Exercise1" />
-      <module name="reactive-example" />
-      <extension name="coverage">
-        <pattern>
-          <option name="PATTERN" value="io.javabrains.reactiveworkshop.*" />
-          <option name="ENABLED" value="true" />
-        </pattern>
-      </extension>
-      <method v="2">
-        <option name="Make" enabled="true" />
-      </method>
-    </configuration>
-    <configuration name="Exercise2" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
-      <option name="MAIN_CLASS_NAME" value="io.javabrains.reactiveworkshop.Exercise2" />
-      <module name="reactive-example" />
-      <extension name="coverage">
-        <pattern>
-          <option name="PATTERN" value="io.javabrains.reactiveworkshop.*" />
-          <option name="ENABLED" value="true" />
-        </pattern>
-      </extension>
-      <method v="2">
-        <option name="Make" enabled="true" />
-      </method>
-    </configuration>
-    <configuration name="Exercise7" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
-      <option name="MAIN_CLASS_NAME" value="io.javabrains.reactiveworkshop.Exercise7" />
-      <module name="reactive-example" />
-      <extension name="coverage">
-        <pattern>
-          <option name="PATTERN" value="io.javabrains.reactiveworkshop.*" />
-          <option name="ENABLED" value="true" />
-        </pattern>
-      </extension>
-      <method v="2">
-        <option name="Make" enabled="true" />
-      </method>
-    </configuration>
-    <configuration name="Exercise8" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
-      <option name="MAIN_CLASS_NAME" value="io.javabrains.reactiveworkshop.Exercise8" />
-      <module name="reactive-example" />
-      <extension name="coverage">
-        <pattern>
-          <option name="PATTERN" value="io.javabrains.reactiveworkshop.*" />
-          <option name="ENABLED" value="true" />
-        </pattern>
-      </extension>
-      <method v="2">
-        <option name="Make" enabled="true" />
-      </method>
-    </configuration>
-    <configuration name="Exercise9" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
-      <option name="MAIN_CLASS_NAME" value="io.javabrains.reactiveworkshop.Exercise9" />
-      <module name="reactive-example" />
-      <extension name="coverage">
-        <pattern>
-          <option name="PATTERN" value="io.javabrains.reactiveworkshop.*" />
-          <option name="ENABLED" value="true" />
-        </pattern>
-      </extension>
-      <method v="2">
-        <option name="Make" enabled="true" />
-      </method>
-    </configuration>
-    <recent_temporary>
-      <list>
-        <item itemvalue="Application.Exercise1" />
-        <item itemvalue="Application.Exercise2" />
-        <item itemvalue="Application.Exercise7" />
-        <item itemvalue="Application.Exercise9" />
-        <item itemvalue="Application.Exercise8" />
-      </list>
-    </recent_temporary>
-  </component>
-  <component name="SpellCheckerSettings" RuntimeDictionaries="0" Folders="0" CustomDictionaries="0" DefaultDictionary="application-level" UseSingleDictionary="true" transferred="true" />
-  <component name="TaskManager">
-    <task active="true" id="Default" summary="Default task">
-      <changelist id="684c8c37-4a27-4f62-9e94-e17cc2f8eb5e" name="Changes" comment="" />
-      <created>1650213103534</created>
-      <option name="number" value="Default" />
-      <option name="presentableId" value="Default" />
-      <updated>1650213103534</updated>
-    </task>
-    <servers />
-  </component>
-  <component name="Vcs.Log.Tabs.Properties">
-    <option name="TAB_STATES">
-      <map>
-        <entry key="MAIN">
-          <value>
-            <State />
-          </value>
-        </entry>
-      </map>
-    </option>
-  </component>
-  <component name="XSLT-Support.FileAssociations.UIState">
-    <expand />
-    <select />
-  </component>
-</project>
\ No newline at end of file