5666N/A/*
5666N/A * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
5666N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5666N/A *
5666N/A * This code is free software; you can redistribute it and/or modify it
5666N/A * under the terms of the GNU General Public License version 2 only, as
5666N/A * published by the Free Software Foundation.
5666N/A *
5666N/A * This code is distributed in the hope that it will be useful, but WITHOUT
5666N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
5666N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
5666N/A * version 2 for more details (a copy is included in the LICENSE file that
5666N/A * accompanied this code).
5666N/A *
5666N/A * You should have received a copy of the GNU General Public License version
5666N/A * 2 along with this work; if not, write to the Free Software Foundation,
5666N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
5666N/A *
5666N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
5666N/A * or visit www.oracle.com if you need additional information or have any
5666N/A * questions.
5666N/A */
5666N/A
5666N/A/**
5666N/A * @test
5666N/A * @bug 7042126
5666N/A * @summary Verify that we do not leak contents when we clone a HashMap
5666N/A * @author david.buck@oracle.com
5666N/A * @run main/othervm HashMapCloneLeak
5666N/A * @run main/othervm -XX:+AggressiveOpts HashMapCloneLeak
5666N/A */
5666N/A
5666N/Aimport java.util.HashMap;
5666N/Aimport java.lang.ref.WeakReference;
5666N/A
5666N/Apublic class HashMapCloneLeak {
5666N/A
5666N/A static WeakReference<Object> wr = null;
5666N/A
5666N/A // helper method to keep testObject and map out of main method's scope
5666N/A private static HashMap<Integer, Object> makeMap() {
5666N/A HashMap<Integer, Object> map = new HashMap<Integer, Object>();
5666N/A Object testObject = new Object();
5666N/A wr = new WeakReference<Object>(testObject);
5666N/A map.put(42, testObject);
5666N/A return map;
5666N/A }
5666N/A
5666N/A public static void main(String[] args) throws Exception {
5666N/A HashMap<Integer, Object> hm = makeMap();
5666N/A hm = (HashMap<Integer, Object>)hm.clone();
5666N/A hm.clear();
5666N/A // There should no longer be a strong reference to testObject
5666N/A // the WeakReference should be nulled out by GC. If not,
5666N/A // we will hang here until timed out by the test harness.
5666N/A Object[] chain = null;
5666N/A while (wr.get() != null) {
5666N/A try {
5666N/A Object[] allocate = new Object[1000000];
5666N/A allocate[0] = chain;
5666N/A chain = allocate;
5666N/A } catch (OutOfMemoryError oome) {
5666N/A chain = null;
5666N/A }
5666N/A System.gc();
5666N/A Thread.sleep(100);
5666N/A }
5666N/A }
5666N/A
5666N/A}