Build with Java 11 (#425)

Some plugins now require Java 11.

.github/scripts/build.sh

@@ -2,4 +2,4 @@
 
 set -e
 
-./mvnw install --batch-mode --show-version
+./mvnw install --batch-mode --show-version -Denforce.java-version.skip

.github/scripts/deploy.sh

@@ -8,5 +8,6 @@ set +x
     -P attach-site-descriptor,sign-artifacts,ossrh-deploy \
     -DskipTests \
     -Dinvoker.skip=true \
+    -Denforce.java-version.skip \
     --batch-mode \
     --show-version

.github/workflows/build.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Set up JDK
         uses: actions/setup-java@v1
         with:
-          java-version: '1.8'
+          java-version: '11'
       - name: Build with Maven
         run: .github/scripts/build.sh
 
@@ -37,7 +37,7 @@ jobs:
       - name: Set up JDK
         uses: actions/setup-java@v1
         with:
-          java-version: '1.8'
+          java-version: '11'
       - name: Install GPG key
         run: |-
           gpg --batch --import-options import-show --import << EOF

.github/workflows/verify.yml

@@ -21,6 +21,6 @@ jobs:
       - name: Set up JDK
         uses: actions/setup-java@v1
         with:
-          java-version: '1.8'
+          java-version: '11'
       - name: Build with Maven
         run: .github/scripts/build.sh

java-parent/pom.xml

@@ -16,7 +16,6 @@
   <description>Parent for Java projects</description>
 
   <properties>
-    <java.require.version>${java.target.version}</java.require.version>
     <java.target.version>11</java.target.version>
   </properties>
 

java8-parent/pom.xml

@@ -16,6 +16,8 @@
   <description>Parent for Java 8 projects</description>
 
   <properties>
+    <java.require.version>[${java.target.version},9)</java.require.version>
+    <java.target.version>1.8</java.target.version>
     <javac.version>9+181-r4173-1</javac.version>
   </properties>
 
@@ -50,4 +52,16 @@
     </plugins>
   </build>
 
+  <profiles>
+    <profile>
+      <id>post-java-9</id>
+      <activation>
+        <jdk>[9,)</jdk>
+      </activation>
+      <properties>
+        <jdeps.multiRelease>9</jdeps.multiRelease>
+        <maven.compiler.release>8</maven.compiler.release>
+      </properties>
+    </profile>
+  </profiles>
 </project>

java8-parent/src/it/basic/invoker.properties

@@ -0,0 +1 @@
+invoker.goals = clean install -Denforce.java-version.skip

java8-parent/src/it/basic/src/main/java/example/Example.java

@@ -3,6 +3,7 @@
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 
+/** Example class. */
 @Slf4j
 @RequiredArgsConstructor
 public class Example {
@@ -13,6 +14,7 @@ public void log() {
         log.info("msg");
     }
 
+    /** Example bean. */
     @Data
     @Builder
     public static class ExampleBean {

kotlin-parent/pom.xml

@@ -15,6 +15,11 @@
   <name>Kotlin Parent</name>
   <description>Parent for Kotlin projects</description>
 
+  <properties>
+    <java.require.version>[${java.target.version},9)</java.require.version>
+    <java.target.version>1.8</java.target.version>
+  </properties>
+
   <build>
     <sourceDirectory>${project.basedir}/src/main/kotlin</sourceDirectory>
     <testSourceDirectory>${project.basedir}/src/test/kotlin</testSourceDirectory>

pom.xml

@@ -32,8 +32,7 @@
     <guava.version>31.1-jre</guava.version>
     <jacoco-maven-plugin.version>0.8.7</jacoco-maven-plugin.version>
     <jacoco.file.minimum-coverage-ratio>0.75</jacoco.file.minimum-coverage-ratio>
-    <java.require.version>[${java.target.version},9)</java.require.version>
-    <java.target.version>1.8</java.target.version>
+    <java.target.version>11</java.target.version>
     <jdepend-maven-plugin.version>2.0</jdepend-maven-plugin.version>
     <jib-maven-plugin.version>3.2.0</jib-maven-plugin.version>
     <jsr305.version>3.0.2</jsr305.version>
@@ -597,9 +596,6 @@
                 <requireMavenVersion>
                   <version>[3.5.4,3.7)</version>
                 </requireMavenVersion>
-                <requireJavaVersion>
-                  <version>${java.require.version}</version>
-                </requireJavaVersion>
                 <!-- When there are multiple versions of a dependency you have to choose which one to use. -->
                 <dependencyConvergence/>
                 <requireReleaseDeps>
@@ -825,6 +821,41 @@
       </properties>
     </profile>
 
+    <profile>
+      <id>enforce-java-version</id>
+      <activation>
+        <property>
+          <name>!enforce.java-version.skip</name>
+        </property>
+      </activation>
+      <properties>
+        <java.require.version>${java.target.version}</java.require.version>
+      </properties>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-enforcer-plugin</artifactId>
+            <executions>
+              <execution>
+                <id>enforce-java-version</id>
+                <goals>
+                  <goal>enforce</goal>
+                </goals>
+                <configuration>
+                  <rules>
+                    <requireJavaVersion>
+                      <version>${java.require.version}</version>
+                    </requireJavaVersion>
+                  </rules>
+                </configuration>
+              </execution>
+            </executions>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
+
     <profile>
       <id>find-sec-bugs</id>
       <properties>