Configure project to explicitly use JDK 11 for IntelliJ recognition

CHANGELOG.md

@@ -4,6 +4,7 @@
 ### Added
 
 ### Changed
+- Configure Gradle build to explicitly specify JDK 11 requirements for better IDE integration
 - update dependencies
 ### Deprecated
 

README.adoc

@@ -26,6 +26,10 @@ This is an experimentel feature.
 
 * Current build state : image:https://github.com/ehmkah/imgdiff/actions/workflows/gradle-test.yml/badge.svg[link="https://github.com/ehmkah/imgdiff/actions/workflows/gradle-test.yml/badge.svg"]
 
+=== Requirements
+* Java 11 or higher (project is configured to use Java 11)
+
+=== Setup
 * Import to intellij with gradle
 * Run task `runIde`
 

build.gradle

@@ -9,6 +9,12 @@ apply plugin: 'org.jetbrains.changelog'
 group 'de.ehmkah.projects'
 version '1.12.0-SNAPSHOT'
 
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(11)
+    }
+}
+
 repositories {
     mavenCentral()
 }
@@ -20,6 +26,18 @@ dependencies {
     testImplementation('com.nhaarman.mockitokotlin2:mockito-kotlin:2.2.0')
 }
 
+compileKotlin {
+    kotlinOptions {
+        jvmTarget = "11"
+    }
+}
+
+compileTestKotlin {
+    kotlinOptions {
+        jvmTarget = "11"
+    }
+}
+
 intellij {
     version.set('2021.2')
     patchPluginXml {

gradle.properties

@@ -0,0 +1,3 @@
+# Java version configuration
+# Explicitly set Java version requirement
+java.version=11