[GERONIMO-4868] cglib ThreadLocal causing ClassLoader memory leak

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.1.4
• Fix Version/s: 2.1.5, 2.2, 3.0.0
• Security Level: public (Regular issues)
• Assignee: Kevan Lee Miller
• Reporter: Kevan Lee Miller
• Created: 13/Sep/09 15:54
• Updated: 04/Feb/10 06:54
• Resolved: 13/Sep/09 21:30

Description

ghostknife reported an OOME PermGen failure during a redeploy of an app. I took at the .hprof file generated on an OOME when -XX:+HeapDumpOnOutOfMemoryError is set.

One leak is caused by the following:

Class Name                                                                                                               | Shallow Heap | Retained Heap 
--------------------------------------------------------------------------------------------------------------------------------------------------------
org.apache.geronimo.kernel.config.MultiParentClassLoader @ 0xac80f258                                                    |           96 |        13,896 
|- parent org.apache.geronimo.kernel.config.ChildrenConfigurationClassLoader @ 0xac80f470                                |           72 |           720 
|  '- [1] java.lang.ClassLoader[10] @ 0xac813d18                                                                         |           56 |           776 
|     '- parents org.apache.geronimo.kernel.config.MultiParentClassLoader @ 0xac812f88                                   |           96 |         7,304 
|        '- <classloader> class org.apache.geronimo.management.geronimo.WebModule$$EnhancerByCGLIB$$aaa027b5 @ 0xb1bd48a8|          432 |         8,784 
|           '- proxyType org.apache.geronimo.kernel.basic.ProxyMethodInterceptor @ 0xac849258                            |           24 |        46,904 
|              '- [0] net.sf.cglib.proxy.Callback[1] @ 0xac846ce8                                                        |           16 |        46,920 
|                 '- value java.lang.ThreadLocal$ThreadLocalMap$Entry @ 0xac844080                                       |           32 |        46,952 
|                    '- [8] java.lang.ThreadLocal$ThreadLocalMap$Entry[64] @ 0xac7c80b0                                  |          272 |       106,984 
|                       '- table java.lang.ThreadLocal$ThreadLocalMap @ 0xac730ba8                                       |           24 |       107,008 
|                          '- threadLocals java.lang.Thread @ 0xac726f80  DefaultThreadPool 1 Thread                     |           88 |       107,584 
--------------------------------------------------------------------------------------------------------------------------------------------------------