Handle Java 28 in standard places and in tests

Jenkinsfile

@@ -10,7 +10,7 @@ pipeline {
 	}
 	tools {
 		maven 'apache-maven-latest'
-		jdk 'openjdk-jdk27-latest'
+		jdk 'openjdk-jdk28-latest'
 	}
 	environment {
 		NON_MODULAR_JAVA_HOME = tool(type:'jdk', name:'temurin-jdk8-latest')
@@ -21,7 +21,7 @@ pipeline {
 				xvnc(useXauthority: true) {
 					sh """
 					mvn clean verify --batch-mode --fail-at-end -Dmaven.repo.local=$WORKSPACE/.m2/repository \
-						-Ptest-on-javase-27 -Pbree-libs -Papi-check -Pjavadoc\
+						-Ptest-on-javase-28 -Pbree-libs -Papi-check -Pjavadoc\
 						-Dmaven.test.failure.ignore=true\
 						-Dcompare-version-with-baselines.skip=false \
 						-Dproject.build.sourceEncoding=UTF-8 \

org.eclipse.jdt.debug.tests/META-INF/MANIFEST.MF

@@ -2,7 +2,7 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: %pluginName
 Bundle-SymbolicName: org.eclipse.jdt.debug.tests; singleton:=true
-Bundle-Version: 3.12.1050.qualifier
+Bundle-Version: 3.12.1100.qualifier
 Bundle-ClassPath: javadebugtests.jar
 Bundle-Activator: org.eclipse.jdt.debug.testplugin.JavaTestPlugin
 Bundle-Vendor: %providerName

org.eclipse.jdt.debug.tests/build.properties

@@ -1,5 +1,5 @@
 ###############################################################################
-#  Copyright (c) 2003, 2024 IBM Corporation and others.
+#  Copyright (c) 2003, 2026 IBM Corporation and others.
 #
 #  This program and the accompanying materials
 #  are made available under the terms of the Eclipse Public License 2.0
@@ -28,7 +28,7 @@ bin.includes = plugin.xml,\
                java16_/,\
                java23/,\
                java24/,\
-               java27/,\
+               java28/,\
                multirelease/
 source.javadebugtests.jar = test plugin/,\
                             tests/,\

org.eclipse.jdt.debug.tests/java28/Main2.java

@@ -0,0 +1,3 @@
+void main() {
+	IO.print("test");
+}

org.eclipse.jdt.debug.tests/pom.xml

@@ -18,7 +18,7 @@
   </parent>
   <groupId>org.eclipse.jdt</groupId>
   <artifactId>org.eclipse.jdt.debug.tests</artifactId>
-  <version>3.12.1050-SNAPSHOT</version>
+  <version>3.12.1100-SNAPSHOT</version>
   <packaging>eclipse-test-plugin</packaging>
   <properties>
     <testSuite>${project.artifactId}</testSuite>
@@ -169,5 +169,31 @@
 			</plugins>
 		</build>
 	</profile>
+	<profile>
+		<id>test-on-javase-28</id>
+		<build>
+			<plugins>
+				<plugin>
+					<groupId>org.apache.maven.plugins</groupId>
+					<artifactId>maven-toolchains-plugin</artifactId>
+					<executions>
+						<execution>
+							<phase>validate</phase>
+							<goals>
+								<goal>toolchain</goal>
+							</goals>
+						</execution>
+					</executions>
+					<configuration>
+						<toolchains>
+							<jdk>
+								<id>JavaSE-28</id>
+							</jdk>
+						</toolchains>
+					</configuration>
+				</plugin>
+			</plugins>
+		</build>
+	</profile>
   </profiles>
 </project>

org.eclipse.jdt.debug.tests/test plugin/org/eclipse/jdt/debug/testplugin/JavaProjectHelper.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- *  Copyright (c) 2000, 2025 IBM Corporation and others.
+ *  Copyright (c) 2000, 2026 IBM Corporation and others.
  *
  *  This program and the accompanying materials
  *  are made available under the terms of the Eclipse Public License 2.0
@@ -8,6 +8,10 @@
  *
  *  SPDX-License-Identifier: EPL-2.0
  *
+ * This is an implementation of an early-draft specification developed under the Java
+ * Community Process (JCP) and is made available for testing and evaluation purposes
+ * only. The code is not compatible with any specification of the JCP.
+ *
  *  Contributors:
  *     IBM Corporation - initial API and implementation
  *     Jesper S. Møller - bug 422029: [1.8] Enable debug evaluation support for default methods
@@ -71,7 +75,7 @@ public class JavaProjectHelper {
 	public static final String JAVA_SE_25_EE_NAME = "JavaSE-25";
 	public static final String JAVA_SE_26_EE_NAME = "JavaSE-26";
 	public static final String JAVA_SE_27_EE_NAME = "JavaSE-27";
-
+	public static final String JAVA_SE_28_EE_NAME = "JavaSE-28";
 	/**
 	 * path to the test src for 'testprograms'
 	 */
@@ -124,6 +128,11 @@ public class JavaProjectHelper {
 	 */
 	public static final IPath TEST_27_SRC_DIR = new Path("java27");
 
+	/**
+	 * path to the 28 test source
+	 */
+	public static final IPath TEST_28_SRC_DIR = new Path("java28");
+
 	/**
 	 * path to the multirelease test source
 	 */
@@ -253,6 +262,15 @@ public static boolean isJava27_Compatible() {
 		return isCompatible(27);
 	}
 
+	/**
+	 * Returns if the currently running VM is version compatible with Java 28
+	 *
+	 * @return <code>true</code> if a Java 28 (or greater) VM is running <code>false</code> otherwise
+	 */
+	public static boolean isJava28_Compatible() {
+		return isCompatible(28);
+	}
+
 	/**
 	 * Returns if the current running system is compatible with the given Java minor version
 	 *

org.eclipse.jdt.debug.tests/tests/org/eclipse/jdt/debug/tests/AbstractDebugTest.java

@@ -8,6 +8,10 @@
  *
  * SPDX-License-Identifier: EPL-2.0
  *
+ * This is an implementation of an early-draft specification developed under the Java
+ * Community Process (JCP) and is made available for testing and evaluation purposes
+ * only. The code is not compatible with any specification of the JCP.
+ *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *     Jesper Steen Møller - bug 422029: [1.8] Enable debug evaluation support for default methods
@@ -196,6 +200,7 @@ public abstract class AbstractDebugTest extends TestCase implements  IEvaluation
 	public static final String TWENTYFIVE_PROJECT_NAME = "Two_Five";
 	public static final String TWENTYSIX_PROJECT_NAME = "Two_Six";
 	public static final String TWENTYSEVEN_PROJECT_NAME = "Two_Seven";
+	public static final String TWENTYEIGHT_PROJECT_NAME = "Two_Eight";
 	public static final String BOUND_JRE_PROJECT_NAME = "BoundJRE";
 	public static final String MR_PROJECT_NAME = "MR";
 	public static final String CLONE_SUFFIX = "Clone";
@@ -262,6 +267,7 @@ public abstract class AbstractDebugTest extends TestCase implements  IEvaluation
 	private static boolean loaded25 = false;
 	private static boolean loaded26 = false;
 	private static boolean loaded27 = false;
+	private static boolean loaded28 = false;
 	private static boolean loadedEE = false;
 	private static boolean loadedJRE = false;
 	private static boolean loadedMulti = false;
@@ -858,6 +864,37 @@ synchronized void assert27Project() {
 			handleProjectCreationException(e, TWENTYSEVEN_PROJECT_NAME, jp);
 		}
 	}
+
+	synchronized void assert28Project() {
+		IJavaProject jp = null;
+		ArrayList<ILaunchConfiguration> cfgs = new ArrayList<>(1);
+		try {
+			if (!loaded28) {
+				jp = createProject(TWENTYEIGHT_PROJECT_NAME, JavaProjectHelper.TEST_28_SRC_DIR.toString(), JavaProjectHelper.JAVA_SE_28_EE_NAME, false);
+				jp.setOption(JavaCore.COMPILER_PB_ENABLE_PREVIEW_FEATURES, JavaCore.DISABLED);
+				jp.setOption(JavaCore.COMPILER_SOURCE, JavaCore.VERSION_28);
+				jp.setOption(JavaCore.COMPILER_COMPLIANCE, JavaCore.VERSION_28);
+				jp.setOption(JavaCore.COMPILER_CODEGEN_TARGET_PLATFORM, JavaCore.VERSION_28);
+				cfgs.add(createLaunchConfiguration(jp, "Main1"));
+				cfgs.add(createLaunchConfiguration(jp, "Main2"));
+				loaded28 = true;
+				waitForBuild();
+				assertNoErrorMarkersExist(jp.getProject());
+			}
+		} catch (Exception e) {
+			try {
+				if (jp != null) {
+					jp.getProject().delete(true, true, null);
+					for (int i = 0; i < cfgs.size(); i++) {
+						cfgs.get(i).delete();
+					}
+				}
+			} catch (CoreException ce) {
+				// ignore
+			}
+			handleProjectCreationException(e, TWENTYEIGHT_PROJECT_NAME, jp);
+		}
+	}
 	/**
 	 * Creates the 'BoundJRE' project used for the JRE testing
 	 */
@@ -1214,6 +1251,16 @@ protected IJavaProject get27Project() {
 		return getJavaProject(TWENTYSEVEN_PROJECT_NAME);
 	}
 
+	/**
+	 * Returns the 'Two_Eight' project, used for Java 27 tests.
+	 *
+	 * @return the test project
+	 */
+	protected IJavaProject get28Project() {
+		assert28Project();
+		return getJavaProject(TWENTYEIGHT_PROJECT_NAME);
+	}
+
 	/**
 	 * Returns the 'BoundJRE' project
 	 *

org.eclipse.jdt.debug.tests/tests/org/eclipse/jdt/debug/tests/AutomatedSuite.java

@@ -8,6 +8,10 @@
  *
  * SPDX-License-Identifier: EPL-2.0
  *
+ * This is an implementation of an early-draft specification developed under the Java
+ * Community Process (JCP) and is made available for testing and evaluation purposes
+ * only. The code is not compatible with any specification of the JCP.
+ *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *     SAP SE - Support hyperlinks for stack entries with method signature
@@ -210,7 +214,7 @@ public AutomatedSuite() {
 		addTest(new TestSuite(ConfigurationEncodingTests.class));
 		addTest(new TestSuite(LaunchConfigurationManagerTests.class));
 		addTest(new TestSuite(LaunchConfigurationTests.class));
-		if (JavaProjectHelper.isJava27_Compatible()) {
+		if (JavaProjectHelper.isJava28_Compatible()) {
 			addTest(new TestSuite(InstanceMainMethodsTests.class));
 		}
 		addTest(new TestSuite(ProjectClasspathVariableTests.class));

org.eclipse.jdt.debug.tests/tests/org/eclipse/jdt/debug/tests/launching/InstanceMainMethodsTests.java

@@ -8,6 +8,10 @@
  *
  * SPDX-License-Identifier: EPL-2.0
  *
+ * This is an implementation of an early-draft specification developed under the Java
+ * Community Process (JCP) and is made available for testing and evaluation purposes
+ * only. The code is not compatible with any specification of the JCP.
+ *
  * Contributors:
  *     Red Hat Inc. - initial implementation
  *******************************************************************************/
@@ -28,7 +32,7 @@ public InstanceMainMethodsTests(String name) {
 
 	@Override
 	protected IJavaProject getProjectContext() {
-		return super.get27Project();
+		return super.get28Project();
 	}
 
 	public void testStaticMainWithoutArgs() throws Exception {

org.eclipse.jdt.launching/launching/org/eclipse/jdt/internal/launching/environments/ExecutionEnvironmentAnalyzer.java

@@ -8,6 +8,10 @@
  *
  * SPDX-License-Identifier: EPL-2.0
  *
+ * This is an implementation of an early-draft specification developed under the Java
+ * Community Process (JCP) and is made available for testing and evaluation purposes
+ * only. The code is not compatible with any specification of the JCP.
+ *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *
@@ -102,7 +106,7 @@ public class ExecutionEnvironmentAnalyzer implements IExecutionEnvironmentAnalyz
 		mappings.put(JavaSE_1_8, new String[] { JavaSE_1_7 });
 		mappings.put(JavaSE_9, new String[] { JavaSE_1_8 });
 		mappings.put(JavaSE_10, new String[] { JavaSE_9 });
-		mappings.put(JavaSE_10_Plus, new String[] { JavaSE_27 });
+		mappings.put(JavaSE_10_Plus, new String[] { JavaSE_28 });
 		mappings.put(JavaSE_11, new String[] { JavaSE_10 });
 		mappings.put(JavaSE_12, new String[] { JavaSE_11 });
 		mappings.put(JavaSE_13, new String[] { JavaSE_12 });