Merge pull request #28 from dmlloyd/java-11

Require Java 11 to build

.github/workflows/build.yml

@@ -19,22 +19,24 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        java: [8, 11]
-    name: build with jdk ${{matrix.java}}
+    name: build with JDK 11
 
     steps:
       - uses: actions/checkout@v2
         name: checkout
 
       - uses: actions/[email protected]
-        name: set up jdk ${{matrix.java}}
+        name: set up JDK 11
         with:
-          java-version: ${{matrix.java}}
+          java-version: 11
+
+      - uses: actions/[email protected]
+        name: set up JDK 8
+        with:
+          java-version: 8
 
       - name: build with maven
-        run: mvn -B formatter:validate verify --file pom.xml
+        run: JAVA_HOME=$JAVA_HOME_11_X64 mvn -B formatter:validate verify --file pom.xml -Djava8.home=$JAVA_HOME_8_X64
 
   quality:
     needs: [build]
@@ -46,7 +48,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/[email protected]
         with:
-          java-version: 8
+          java-version: 11
 
       - name: sonar
         env:

.github/workflows/release.yml

@@ -28,7 +28,7 @@ jobs:
 
       - uses: actions/[email protected]
         with:
-          java-version: 8
+          java-version: 11
 
       - name: maven release ${{steps.metadata.outputs.current-version}}
         run: |

pom.xml

@@ -98,6 +98,26 @@
 
     <build>
         <plugins>
+            <plugin>
+                <artifactId>maven-enforcer-plugin</artifactId>
+                <version>3.0.0-M2</version>
+                <executions>
+                    <execution>
+                        <id>enforce-versions</id>
+                        <goals>
+                            <goal>enforce</goal>
+                        </goals>
+                        <configuration>
+                            <rules>
+                                <requireJavaVersion>
+                                    <version>11</version>
+                                    <message>This project must be built with Java 11 or later.</message>
+                                </requireJavaVersion>
+                            </rules>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-release-plugin</artifactId>