PermGen Leak At org.springframework.cglib.core.AbstractClassGenerator (Doc ID 2301061.1)

Last updated on SEPTEMBER 14, 2017

Applies to:

Oracle WebLogic Server - Version 12.1.3.0.0 and later
Information in this document applies to any platform.

Symptoms

WLS running out of memory in PermGen. Heapdump shows the following:

--------------------

Class Name | Shallow Heap | Retained Heap | Percentage
-------------------------------------------------------------------------------------------------------------------------------------------------
weblogic.utils.classloaders.ChangeAwareClassLoader @ 0x6e1f549c8 | 104 | 17,849,688 | 0.98%
|- class org.springframework.cglib.proxy.Enhancer @ 0x6e2d803f0 | 136 | 15,731,528 | 0.86%
| |- org.springframework.cglib.core.AbstractClassGenerator$Source @ 0x6e2d810a0 | 24 | 15,728,352 | 0.86%
| | '- java.util.WeakHashMap @ 0x6e2d810b8 | 56 | 15,728,328 | 0.86%
| | |- java.util.WeakHashMap$Entry[16] @ 0x6e2d810f0 | 80 | 15,728,224 | 0.86%
| | | '- java.util.WeakHashMap$Entry @ 0x6e2d81140 | 40 | 15,728,144 | 0.86%
| | | '- java.util.HashMap @ 0x6e2d81198 | 48 | 15,728,104 | 0.86%
| | | '- java.util.HashMap$Entry[64] @ 0x6e32344c0 | 272 | 15,728,056 | 0.86%
| | |- java.lang.ref.ReferenceQueue @ 0x6e2d81168 | 32 | 48 | 0.00%
| | '- Total: 2 entries | | |

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Majority of the classloader is filled with Spring objects which are not GC'ed over time causing memory leak in PermGen.

 

Cause

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