Fix Debug Hover not working on inner class constructors

org.eclipse.jdt.debug.tests/java8/InnerClassBug.java

@@ -0,0 +1,28 @@
+/*******************************************************************************
+ * Copyright (c) 2026 IBM Corporation.
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+public class InnerClassBug {
+
+	public static void main(String[] args) {
+		InnerClassBug a = new InnerClassBug();
+		T t = a.new T(4);
+		System.out.println(t.x);
+	}
+
+	private class T {
+		final int x;
+		private T(int x1) {
+			this.x = x1; 
+		}
+	}
+}

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

@@ -551,6 +551,7 @@ synchronized void assert18Project() {
 				cfgs.add(createLaunchConfiguration(jp, "LambdaBreakpoints1"));
 				cfgs.add(createLaunchConfiguration(jp, "GH275"));
 				cfgs.add(createLaunchConfiguration(jp, "LambdaTest"));
+				cfgs.add(createLaunchConfiguration(jp, "InnerClassBug"));
 	    		loaded18 = true;
 	    		waitForBuild();
 	        }

org.eclipse.jdt.debug.tests/tests/org/eclipse/jdt/debug/tests/ui/DebugHoverTests.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- *  Copyright (c) 2017, 2024 Andrey Loskutov and others.
+ *  Copyright (c) 2017, 2026 Andrey Loskutov and others.
  *
  *  This program and the accompanying materials
  *  are made available under the terms of the Eclipse Public License 2.0
@@ -1527,4 +1527,36 @@ public void testResolveIn2Lambdas() throws Exception {
 		}
 	}
 
+	public void testHoverOnInnerClassConstructorVariables() throws Exception {
+		sync(() -> TestUtil.waitForJobs(getName(), 1000, 10000, ProcessConsole.class));
+		final String typeName = "InnerClassBug";
+		final String expectedMethod = "<init>";
+		final int frameNumber = 3;
+		final int bpLine = 25;
+		IJavaBreakpoint bp = createLineBreakpoint(bpLine, "", typeName + ".java", typeName);
+		bp.setSuspendPolicy(IJavaBreakpoint.SUSPEND_THREAD);
+		IFile file = (IFile) bp.getMarker().getResource();
+		assertEquals(typeName + ".java", file.getName());
+		IJavaThread thread = null;
+		try {
+			thread = launchToBreakpoint(typeName);
+			CompilationUnitEditor part = openEditorAndValidateStack(expectedMethod, frameNumber, file, thread);
+			JavaDebugHover hover = new JavaDebugHover();
+			hover.setEditor(part);
+			String variableName = "x1";
+			int offset = part.getViewer().getDocument().get().indexOf("this.x = x1") + " this.x =".length();
+			IRegion region = new Region(offset, variableName.length());
+			String text = selectAndReveal(part, bpLine, region);
+			assertEquals(variableName, text);
+			IVariable info = (IVariable) sync(() -> hover.getHoverInfo2(part.getViewer(), region));
+
+			assertNotNull(info);
+			assertEquals(variableName, info.getName());
+			assertEquals("4", info.getValue().getValueString());
+		} finally {
+			terminateAndRemove(thread);
+			removeAllBreakpoints();
+		}
+	}
+
 }

org.eclipse.jdt.debug.ui/ui/org/eclipse/jdt/internal/debug/ui/JavaDebugHover.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2020 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
@@ -448,7 +448,9 @@ public Object getHoverInfo2(ITextViewer textViewer, IRegion hoverRegion) {
             					}
             					else { // Finding variables in anonymous class
 									int index = frame.getDeclaringTypeName().indexOf('$');
-									if (index > 0) {
+									if (method.isConstructor() && index > 0) {
+										equal = true;
+									} else if (index > 0) {
 										String name = frame.getDeclaringTypeName().substring(index + 1);
 										try {
 											Integer.getInteger(name);