/* * Copyright (c) 2014, 2023, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ import java.awt.Frame; import java.awt.List; import java.lang.ref.PhantomReference; import java.lang.ref.Reference; import java.lang.ref.ReferenceQueue; import jdk.test.lib.util.ForceGC; /* * @test * @key headful * @bug 8040076 * @summary AwtList not garbage collected * @library /test/lib/ * @build jdk.test.lib.util.ForceGC * @run main/othervm -Xmx100m -Xlog:gc=debug AwtListGarbageCollectionTest */ public class AwtListGarbageCollectionTest { private static final long ENQUEUE_TIMEOUT = 50; public static void main(String[] args) throws InterruptedException { Frame frame = new Frame("List leak test"); try { test(frame); } finally { frame.dispose(); } } private static void test(Frame frame) { frame.setSize(300, 200); frame.setVisible(true); List strongListRef = new List(); frame.add(strongListRef); strongListRef.setMultipleMode(true); frame.remove(strongListRef); final ReferenceQueue<List> referenceQueue = new ReferenceQueue<>(); final PhantomReference<List> phantomListRef = new PhantomReference<>(strongListRef, referenceQueue); System.out.println("phantomListRef: " + phantomListRef); strongListRef = null; // Clear the strong reference System.out.println("Waiting for the reference to be cleared"); if (!ForceGC.wait(() -> phantomListRef == remove(referenceQueue))) { throw new RuntimeException("List wasn't garbage collected"); } } private static Reference<?> remove(ReferenceQueue<?> queue) { try { return queue.remove(ENQUEUE_TIMEOUT); } catch (InterruptedException e) { throw new RuntimeException(e); } } }