Add timeout to the launch of Java programs in debug tests

Fixes: #870

Author: trancexpress

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

@@ -1430,7 +1430,7 @@ protected Object launchAndWait(ILaunchConfiguration configuration, DebugEventWai
 	 *             if the event is never received.
 	 */
 	protected Object launchAndWait(ILaunchConfiguration configuration, String mode, DebugEventWaiter waiter, boolean register) throws CoreException {
-		ILaunch launch = configuration.launch(mode, null, false, register);
+		ILaunch launch = configuration.launch(mode, new TimeoutMonitor(DEFAULT_TIMEOUT), false, register);
 		Object suspendee= waiter.waitForEvent();
 		if (suspendee == null) {
 			StringBuilder buf = new StringBuilder();

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

@@ -0,0 +1,65 @@
+/*******************************************************************************
+ * Copyright (c) 2026 Simeon Andreev and others.
+ *
+ * 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:
+ *     Simeon Andreev - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.jdt.debug.tests;
+
+import org.eclipse.core.runtime.IProgressMonitor;
+
+/**
+ * A progress monitor which reports that the task is cancelled if a timeout occurs. The starting time for the timeout is the creation of the monitor.
+ */
+public class TimeoutMonitor implements IProgressMonitor {
+
+	private final long timeoutMs;
+	private final long startMs;
+
+	TimeoutMonitor(long timeoutMs) {
+		this.timeoutMs = timeoutMs;
+		this.startMs = System.currentTimeMillis();
+	}
+
+	@Override
+	public void beginTask(String name, int totalWork) {
+	}
+
+	@Override
+	public void done() {
+	}
+
+	@Override
+	public void internalWorked(double work) {
+	}
+
+	@Override
+	public boolean isCanceled() {
+		return System.currentTimeMillis() - startMs > timeoutMs;
+	}
+
+	@Override
+	public void setCanceled(boolean value) {
+		throw new UnsupportedOperationException();
+	}
+
+	@Override
+	public void setTaskName(String name) {
+	}
+
+	@Override
+	public void subTask(String name) {
+	}
+
+	@Override
+	public void worked(int work) {
+	}
+
+}