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annotate src/org/eclipse/jetty/util/preventers/GCThreadLeakPreventer.java @ 802:3428c60d7cfc

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replace jetty jars with source
author Franklin Schmidt <fschmidt@gmail.com>
date Wed, 07 Sep 2016 21:15:48 -0600
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1 //
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2 // ========================================================================
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
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4 // ------------------------------------------------------------------------
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5 // All rights reserved. This program and the accompanying materials
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6 // are made available under the terms of the Eclipse Public License v1.0
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7 // and Apache License v2.0 which accompanies this distribution.
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8 //
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9 // The Eclipse Public License is available at
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10 // http://www.eclipse.org/legal/epl-v10.html
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11 //
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12 // The Apache License v2.0 is available at
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13 // http://www.opensource.org/licenses/apache2.0.php
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14 //
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15 // You may elect to redistribute this code under either of these licenses.
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16 // ========================================================================
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17 //
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18
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19 package org.eclipse.jetty.util.preventers;
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20
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21 import java.lang.reflect.Method;
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22
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23 /**
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24 * GCThreadLeakPreventer
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25 *
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26 * Prevents a call to sun.misc.GC.requestLatency pinning a webapp classloader
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27 * by calling it with a non-webapp classloader. The problem appears to be that
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28 * when this method is called, a daemon thread is created which takes the
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29 * context classloader. A known caller of this method is the RMI impl. See
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30 * http://stackoverflow.com/questions/6626680/does-java-garbage-collection-log-entry-full-gc-system-mean-some-class-called
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31 *
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32 * This preventer will start the thread with the longest possible interval, although
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33 * subsequent calls can vary that. Recommend to only use this class if you're doing
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34 * RMI.
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35 *
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36 * Inspired by Tomcat JreMemoryLeakPrevention.
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37 *
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38 */
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39 public class GCThreadLeakPreventer extends AbstractLeakPreventer
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40 {
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41 /* ------------------------------------------------------------ */
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42 /**
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43 * @see org.eclipse.jetty.util.preventers.AbstractLeakPreventer#prevent(java.lang.ClassLoader)
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44 */
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45 @Override
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46 public void prevent(ClassLoader loader)
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47 {
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48 try
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49 {
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50 Class clazz = Class.forName("sun.misc.GC");
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51 Method requestLatency = clazz.getMethod("requestLatency", new Class[] {long.class});
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52 requestLatency.invoke(null, Long.valueOf(Long.MAX_VALUE-1));
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53 }
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54 catch (ClassNotFoundException e)
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55 {
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56 LOG.ignore(e);
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57 }
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58 catch (Exception e)
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59 {
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60 LOG.warn(e);
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61 }
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62 }
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63
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64 }