Jake Slack | 03928ae | 2014-05-13 18:41:56 -0700 | [diff] [blame] | 1 | // |
| 2 | // ======================================================================== |
| 3 | // Copyright (c) 1995-2014 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. |
| 8 | // |
| 9 | // The Eclipse Public License is available at |
| 10 | // http://www.eclipse.org/legal/epl-v10.html |
| 11 | // |
| 12 | // The Apache License v2.0 is available at |
| 13 | // http://www.opensource.org/licenses/apache2.0.php |
| 14 | // |
| 15 | // You may elect to redistribute this code under either of these licenses. |
| 16 | // ======================================================================== |
| 17 | // |
| 18 | |
| 19 | package org.eclipse.jetty.util.preventers; |
| 20 | |
| 21 | import java.lang.reflect.Method; |
| 22 | |
| 23 | /** |
| 24 | * GCThreadLeakPreventer |
| 25 | * |
| 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 |
| 31 | * |
| 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 |
| 34 | * RMI. |
| 35 | * |
| 36 | * Inspired by Tomcat JreMemoryLeakPrevention. |
| 37 | * |
| 38 | */ |
| 39 | public class GCThreadLeakPreventer extends AbstractLeakPreventer |
| 40 | { |
| 41 | /* ------------------------------------------------------------ */ |
| 42 | /** |
| 43 | * @see org.eclipse.jetty.util.preventers.AbstractLeakPreventer#prevent(java.lang.ClassLoader) |
| 44 | */ |
| 45 | @Override |
| 46 | public void prevent(ClassLoader loader) |
| 47 | { |
| 48 | try |
| 49 | { |
| 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)); |
| 53 | } |
| 54 | catch (ClassNotFoundException e) |
| 55 | { |
| 56 | LOG.ignore(e); |
| 57 | } |
| 58 | catch (Exception e) |
| 59 | { |
| 60 | LOG.warn(e); |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | } |