2 // ========================================================================
3 // Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
4 // ------------------------------------------------------------------------
5 // All rights reserved. This program and the accompanying materials
6 // are made available under the terms of the Eclipse Public License v1.0
7 // and Apache License v2.0 which accompanies this distribution.
9 // The Eclipse Public License is available at
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12 // The Apache License v2.0 is available at
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15 // You may elect to redistribute this code under either of these licenses.
16 // ========================================================================
19 package org.eclipse.jetty.util.preventers;
21 import java.lang.reflect.Method;
24 * GCThreadLeakPreventer
26 * Prevents a call to sun.misc.GC.requestLatency pinning a webapp classloader
27 * by calling it with a non-webapp classloader. The problem appears to be that
28 * when this method is called, a daemon thread is created which takes the
29 * context classloader. A known caller of this method is the RMI impl. See
30 * http://stackoverflow.com/questions/6626680/does-java-garbage-collection-log-entry-full-gc-system-mean-some-class-called
32 * This preventer will start the thread with the longest possible interval, although
33 * subsequent calls can vary that. Recommend to only use this class if you're doing
36 * Inspired by Tomcat JreMemoryLeakPrevention.
39 public class GCThreadLeakPreventer extends AbstractLeakPreventer
41 /* ------------------------------------------------------------ */
43 * @see org.eclipse.jetty.util.preventers.AbstractLeakPreventer#prevent(java.lang.ClassLoader)
46 public void prevent(ClassLoader loader)
50 Class<?> clazz = Class.forName("sun.misc.GC");
51 Method requestLatency = clazz.getMethod("requestLatency", new Class[] {long.class});
52 requestLatency.invoke(null, Long.valueOf(Long.MAX_VALUE-1));
54 catch (ClassNotFoundException e)