Update to GWT 2.12

Rework JDK testing: always build with the latest (LTS) JDK,
then test with older ones, and because GWT 2.12 requires
JDK 11, then test JDK 8 compatibility with GWT 2.11.

.github/workflows/maven.yml

@@ -8,7 +8,7 @@ on:
     paths-ignore:
       - '**/*.md'
 
-# First build on Linux with JDK 8 and Windows with JDK 11
+# First build on Linux and Windows with JDK 21 (LTS)
 # Then run tests with various JDK and GWT versions (Linux only)
 jobs:
   linux:
@@ -19,7 +19,7 @@ jobs:
       - uses: actions/setup-java@v4
         with:
           distribution: 'temurin'
-          java-version: '8'
+          java-version: '21'
 
       - name: Cache Maven dependencies
         uses: actions/cache@v4
@@ -50,7 +50,7 @@ jobs:
       - uses: actions/setup-java@v4
         with:
           distribution: 'temurin'
-          java-version: '11'
+          java-version: '21'
 
       - name: Cache Maven dependencies
         uses: actions/cache@v4
@@ -73,13 +73,13 @@ jobs:
           name: windows-reports
           path: target/it-tests/*/build.log
 
+  # Note: GWT 2.12 requires JDK 11, so JDK 8 compatibility will be tested independently
   test-jdks:
     needs: linux
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: [ '11', '17', '21' ]
-    continue-on-error: ${{ matrix.java == '21' }}
+        java: [ '11', '17' ]
     steps:
       - uses: actions/checkout@v4
 
@@ -89,7 +89,7 @@ jobs:
           distribution: temurin
           java-version: |
             ${{ matrix.java }}
-            8
+            21
 
       - name: Cache Maven dependencies
         uses: actions/cache@v4
@@ -117,15 +117,15 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        gwt: ["2.10.0", "HEAD-SNAPSHOT"]
+        gwt: ["2.11.0", "HEAD-SNAPSHOT"]
     continue-on-error: ${{ matrix.gwt == 'HEAD-SNAPSHOT' }}
     steps:
       - uses: actions/checkout@v4
 
       - uses: actions/setup-java@v4
         with:
           distribution: 'temurin'
-          java-version: '8'
+          java-version: '21'
 
       - name: Cache Maven dependencies
         uses: actions/cache@v4
@@ -150,12 +150,49 @@ jobs:
           name: gwt-${{ matrix.gwt }}-reports
           path: target/it-tests/*/build.log
 
+  # GWT 2.12 requires JDK 11, so test JDK 8 with 2.11
+  test-jdk8-gwt211:
+    needs: linux
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup JDK 8
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: |
+            8
+            21
+
+      - name: Cache Maven dependencies
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.m2/repository/
+            !~/.m2/repository/**/*-SNAPSHOT/
+            target/it-repo/
+            !target/it-repo/**/*-SNAPSHOT/
+          key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
+
+      - name: Build with Maven
+        id: maven-build
+        run: mvn -B -U -ntp verify --fail-at-end "-Dinvoker.javaHome=$JAVA_HOME_8_X64" -DgwtVersion=2.11.0
+
+      - name: Store reports
+        if: always() && (steps.maven-build.outcome == 'success' || steps.maven-build.outcome == 'failure')
+        uses: actions/upload-artifact@v4
+        with:
+          name: jdk-8-reports
+          path: target/it-tests/*/build.log
+
   deploy_snapshot:
     needs:
       - linux
       - windows
       - test-jdks
       - test-gwt
+      - test-jdk8-gwt211
     if: github.event_name == 'push' && github.ref == 'refs/heads/main'
     runs-on: ubuntu-latest
     steps:
@@ -164,7 +201,7 @@ jobs:
       - uses: actions/setup-java@v4
         with:
           distribution: 'temurin'
-          java-version: '11'
+          java-version: '21'
           server-id: 'ossrh'
           server-username: OSSRH_USERNAME
           server-password: OSSRH_TOKEN

pom.xml

@@ -71,7 +71,7 @@
     <project.build.outputEncoding>UTF-8</project.build.outputEncoding>
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 
-    <gwtVersion>2.11.0</gwtVersion>
+    <gwtVersion>2.12.0</gwtVersion>
   </properties>
 
   <dependencies>