Please review this trivial fix for test:java/lang/ThreadGroup/Stop.java Though this is a test for a deprecated API, failed with very very low frequency and hard to reproduce (I got no luck to reproduce it), I’d like to patch it as suggested: extend the sleep in the main thread from one second to five seconds. Also added 'volatile' to the boolean variable 'groupStopped'. bug: https://bugs.openjdk.java.net/browse/JDK-8132548 webrev: http://cr.openjdk.java.net/~amlu/8132548/webrev.00/ Thanks, Amy --- old/test/java/lang/ThreadGroup/Stop.java 2016-07-04 14:53:59.000000000 +0800 +++ new/test/java/lang/ThreadGroup/Stop.java 2016-07-04 14:53:58.000000000 +0800 @@ -1,5 +1,5 @@ /* - * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved. + * Copyright (c) 1999, 2016, 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 @@ -29,7 +29,7 @@ */ public class Stop implements Runnable { - private static boolean groupStopped = false ; + private static volatile boolean groupStopped = false ; private static final Object lock = new Object(); private static final ThreadGroup group = new ThreadGroup(""); @@ -70,7 +70,7 @@ while (!groupStopped) { lock.wait(); // Give the other thread a chance to stop - Thread.sleep(1000); + Thread.sleep(5000); } }