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1   //
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.
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 javax.xml.parsers.DocumentBuilderFactory;
22  
23  /**
24   * DOMLeakPreventer
25   *
26   * See http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6916498
27   * 
28   * Prevent the RuntimeException that is a static member of AbstractDOMParser
29   * from pinning a webapp classloader by causing it to be set here by a non-webapp classloader.
30   * 
31   * Note that according to the bug report, a heap dump may not identify the GCRoot, making 
32   * it difficult to identify the cause of the leak.
33   *
34   */
35  public class DOMLeakPreventer extends AbstractLeakPreventer
36  {
37      /* ------------------------------------------------------------ */
38      /** 
39       * @see org.eclipse.jetty.util.preventers.AbstractLeakPreventer#prevent(java.lang.ClassLoader)
40       */
41      @Override
42      public void prevent(ClassLoader loader)
43      {
44          DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
45          try 
46          {
47              factory.newDocumentBuilder();
48          } 
49          catch (Exception e) 
50          {
51              LOG.warn(e);
52          }
53  
54      }
55  
56  }