Use Java 11 for build but 8 as target platform

build-plugins/build.gradle

@@ -44,6 +44,10 @@ dependencies {
 gradlePlugin {
   // Define the plugin
   plugins {
+    javaModule {
+      id = 'org.scm-manager.java'
+      implementationClass = 'com.cloudogu.scm.JavaModulePlugin'
+    }
     buildInfo {
       id = 'org.scm-manager.build-info'
       implementationClass = 'com.cloudogu.scm.BuildInfoPlugin'

build-plugins/src/main/groovy/com/cloudogu/scm/JavaModulePlugin.groovy

@@ -0,0 +1,45 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020-present Cloudogu GmbH and Contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.cloudogu.scm
+
+import org.gradle.api.Plugin
+import org.gradle.api.Project
+import org.gradle.jvm.toolchain.JavaLanguageVersion
+
+class JavaModulePlugin implements Plugin<Project> {
+
+  void apply(Project project) {
+    project.afterEvaluate {
+      project.java {
+        toolchain {
+          languageVersion = JavaLanguageVersion.of(11)
+        }
+      }
+      project.compileJava {
+        options.release = 8
+      }
+    }
+  }
+
+}

build.gradle

@@ -117,11 +117,6 @@ subprojects {
     }
   }
 
-  project.tasks.withType(JavaCompile) {
-    sourceCompatibility = JavaVersion.VERSION_1_8
-    targetCompatibility = JavaVersion.VERSION_1_8
-  }
-
   apply from: rootProject.file( 'gradle/dependencies.gradle' )
 }
 

scm-annotation-processor/build.gradle

@@ -24,6 +24,7 @@
 
 plugins {
   id 'java-library'
+  id 'org.scm-manager.java'
 }
 
 dependencies {

scm-annotations/build.gradle

@@ -24,6 +24,7 @@
 
 plugins {
   id 'java-library'
+  id 'org.scm-manager.java'
 }
 
 dependencies {

scm-core/build.gradle

@@ -24,6 +24,7 @@
 
 plugins {
   id 'java-library'
+  id 'org.scm-manager.java'
   id 'org.scm-manager.build-info'
 }
 

scm-dao-xml/build.gradle

@@ -24,6 +24,7 @@
 
 plugins {
   id 'java-library'
+  id 'org.scm-manager.java'
 }
 
 dependencies {

scm-it/build.gradle

@@ -24,6 +24,7 @@
 
 plugins {
   id 'java-library'
+  id 'org.scm-manager.java'
   id 'org.scm-manager.integration-tests'
 }
 

scm-server/build.gradle

@@ -24,6 +24,7 @@
 
 plugins {
   id 'java-library'
+  id 'org.scm-manager.java'
 }
 
 dependencies {

scm-test/build.gradle

@@ -24,6 +24,7 @@
 
 plugins {
   id 'java-library'
+  id 'org.scm-manager.java'
 }
 
 dependencies {

scm-webapp/build.gradle

@@ -24,8 +24,9 @@
 
 plugins {
   id 'war'
-  id 'org.scm-manager.core-plugins'
+  id 'org.scm-manager.java'
   id 'org.scm-manager.serve'
+  id 'org.scm-manager.core-plugins'
   id 'io.swagger.core.v3.swagger-gradle-plugin' version '2.1.6'
 }