Add defaut base image for Java 21

docs/google-cloud-build.md

@@ -13,7 +13,7 @@ Any Java container can be used for building, not only the `gcr.io/cloud-builders
 
 ```yaml
 steps:
-  - name: 'docker.io/library/eclipse-temurin:17'
+  - name: 'docker.io/library/eclipse-temurin:21'
     entrypoint: './gradlew'
     args: ['--console=plain', '--no-daemon', ':server:jib', '-Djib.to.image=gcr.io/$PROJECT_ID/$REPO_NAME:$COMMIT_SHA']
 ```

jib-cli/src/main/java/com/google/cloud/tools/jib/cli/jar/JarFiles.java

@@ -89,6 +89,9 @@ private static String getDefaultBaseImage(ArtifactProcessor processor) {
     if (processor.getJavaVersion() <= 11) {
       return "eclipse-temurin:11-jre";
     }
-    return "eclipse-temurin:17-jre";
+    if (processor.getJavaVersion() <= 17) {
+      return "eclipse-temurin:17-jre";
+    }
+    return "eclipse-temurin:21-jre";
   }
 }

jib-cli/src/test/java/com/google/cloud/tools/jib/cli/jar/JarFilesTest.java

@@ -72,6 +72,7 @@ public class JarFilesTest {
         "11, eclipse-temurin:11-jre",
         "13, eclipse-temurin:17-jre",
         "17, eclipse-temurin:17-jre",
+        "21, eclipse-temurin:21-jre",
       })
   public void testToJibContainer_defaultBaseImage(int javaVersion, String expectedBaseImage)
       throws IOException, InvalidImageReferenceException {

jib-gradle-plugin/README.md

@@ -212,7 +212,7 @@ Field | Type | Default | Description
 
 Property | Type | Default | Description
 --- | --- | --- | ---
-`image` | `String` | `eclipse-temurin:{8,11,17}-jre` (or `jetty` for WAR) | The image reference for the base image. The source type can be specified using a [special type prefix](#setting-the-base-image).
+`image` | `String` | `eclipse-temurin:{8,11,17,21}-jre` (or `jetty` for WAR) | The image reference for the base image. The source type can be specified using a [special type prefix](#setting-the-base-image).
 `auth` | [`auth`](#auth-closure) | *None* | Specifies credentials directly (alternative to `credHelper`).
 `credHelper` | `String` | *None* | Specifies a credential helper that can authenticate pulling the base image. This parameter can either be configured as an absolute path to the credential helper executable or as a credential helper suffix (following `docker-credential-`).
 `platforms` | [`platforms`](#platforms-closure) | See [`platforms`](#platforms-closure) | Configures platforms of base images to select from a manifest list.

jib-maven-plugin/README.md

@@ -261,7 +261,7 @@ Field | Type | Default | Description
 
 Property | Type | Default | Description
 --- | --- | --- | ---
-`image` | string | `eclipse-temurin:{8,11,17}-jre` (or `jetty` for WAR) | The image reference for the base image. The source type can be specified using a [special type prefix](#setting-the-base-image).
+`image` | string | `eclipse-temurin:{8,11,17,21}-jre` (or `jetty` for WAR) | The image reference for the base image. The source type can be specified using a [special type prefix](#setting-the-base-image).
 `auth` | [`auth`](#auth-object) | *None* | Specifies credentials directly (alternative to `credHelper`).
 `credHelper` | string | *None* | Specifies a credential helper that can authenticate pulling the base image. This parameter can either be configured as an absolute path to the credential helper executable or as a credential helper suffix (following `docker-credential-`).
 `platforms` | list | See [`platform`](#platform-object) | Configures platforms of base images to select from a manifest list.

jib-plugins-common/src/main/java/com/google/cloud/tools/jib/plugins/common/PluginConfigurationProcessor.java

@@ -530,6 +530,9 @@ static JavaContainerBuilder getJavaContainerBuilderWithBaseImage(
     if (isKnownJava17Image(prefixRemoved) && javaVersion > 17) {
       throw new IncompatibleBaseImageJavaVersionException(17, javaVersion);
     }
+    if (isKnownJava21Image(prefixRemoved) && javaVersion > 21) {
+      throw new IncompatibleBaseImageJavaVersionException(21, javaVersion);
+    }
 
     ImageReference baseImageReference = ImageReference.parse(prefixRemoved);
     if (baseImageConfig.startsWith(Jib.DOCKER_DAEMON_IMAGE_PREFIX)) {
@@ -772,8 +775,10 @@ static String getDefaultBaseImage(ProjectProperties projectProperties)
       return "eclipse-temurin:11-jre";
     } else if (javaVersion <= 17) {
       return "eclipse-temurin:17-jre";
+    } else if (javaVersion <= 21) {
+      return "eclipse-temurin:21-jre";
     }
-    throw new IncompatibleBaseImageJavaVersionException(17, javaVersion);
+    throw new IncompatibleBaseImageJavaVersionException(21, javaVersion);
   }
 
   /**
@@ -1097,4 +1102,14 @@ private static boolean isKnownJava11Image(String imageReference) {
   private static boolean isKnownJava17Image(String imageReference) {
     return imageReference.startsWith("eclipse-temurin:17");
   }
+
+  /**
+   * Checks if the given image is a known Java 21 image. May return false negative.
+   *
+   * @param imageReference the image reference
+   * @return {@code true} if the image is a known Java 21 image
+   */
+  private static boolean isKnownJava21Image(String imageReference) {
+    return imageReference.startsWith("eclipse-temurin:21");
+  }
 }

jib-plugins-common/src/test/java/com/google/cloud/tools/jib/plugins/common/PluginConfigurationProcessorTest.java

@@ -903,7 +903,8 @@ public void testGetDefaultBaseImage_warProject()
         "9, eclipse-temurin:11-jre",
         "11, eclipse-temurin:11-jre",
         "13, eclipse-temurin:17-jre",
-        "17, eclipse-temurin:17-jre"
+        "17, eclipse-temurin:17-jre",
+        "21, eclipse-temurin:21-jre"
       })
   public void testGetDefaultBaseImage_defaultJavaBaseImage(
       int javaVersion, String expectedBaseImage) throws IncompatibleBaseImageJavaVersionException {
@@ -913,16 +914,16 @@ public void testGetDefaultBaseImage_defaultJavaBaseImage(
   }
 
   @Test
-  public void testGetDefaultBaseImage_projectHigherThanJava17() {
-    when(projectProperties.getMajorJavaVersion()).thenReturn(20);
+  public void testGetDefaultBaseImage_projectHigherThanJava21() {
+    when(projectProperties.getMajorJavaVersion()).thenReturn(22);
 
     IncompatibleBaseImageJavaVersionException exception =
         assertThrows(
             IncompatibleBaseImageJavaVersionException.class,
             () -> PluginConfigurationProcessor.getDefaultBaseImage(projectProperties));
 
-    assertThat(exception.getBaseImageMajorJavaVersion()).isEqualTo(17);
-    assertThat(exception.getProjectMajorJavaVersion()).isEqualTo(20);
+    assertThat(exception.getBaseImageMajorJavaVersion()).isEqualTo(21);
+    assertThat(exception.getProjectMajorJavaVersion()).isEqualTo(22);
   }
 
   @Test
@@ -980,7 +981,9 @@ public void testGetJavaContainerBuilderWithBaseImage_registryWithPrefix()
         "eclipse-temurin:11, 11, 15",
         "eclipse-temurin:11-jre, 11, 15",
         "eclipse-temurin:17, 17, 19",
-        "eclipse-temurin:17-jre, 17, 19"
+        "eclipse-temurin:17-jre, 17, 19",
+        "eclipse-temurin:21, 21, 22",
+        "eclipse-temurin:21-jre, 21, 22"
       })
   public void testGetJavaContainerBuilderWithBaseImage_incompatibleJavaBaseImage(
       String baseImage, int baseImageJavaVersion, int appJavaVersion) {
@@ -1010,17 +1013,17 @@ public void testGetJavaContainerBuilderWithBaseImage_java12BaseImage()
   }
 
   @Test
-  public void testGetJavaContainerBuilderWithBaseImage_java19NoBaseImage() {
-    when(projectProperties.getMajorJavaVersion()).thenReturn(19);
+  public void testGetJavaContainerBuilderWithBaseImage_java22NoBaseImage() {
+    when(projectProperties.getMajorJavaVersion()).thenReturn(22);
     when(rawConfiguration.getFromImage()).thenReturn(Optional.empty());
     IncompatibleBaseImageJavaVersionException exception =
         assertThrows(
             IncompatibleBaseImageJavaVersionException.class,
             () ->
                 PluginConfigurationProcessor.getJavaContainerBuilderWithBaseImage(
                     rawConfiguration, projectProperties, inferredAuthProvider));
-    assertThat(exception.getBaseImageMajorJavaVersion()).isEqualTo(17);
-    assertThat(exception.getProjectMajorJavaVersion()).isEqualTo(19);
+    assertThat(exception.getBaseImageMajorJavaVersion()).isEqualTo(21);
+    assertThat(exception.getProjectMajorJavaVersion()).isEqualTo(22);
   }
 
   @Test