Aborted transactions not being cleared causing memory leak resulting in OutOfMemoryError: PermGen/Metaspace

Solution Unverified - Updated

Environment

  • JBoss Enterprise Application Platform (EAP)
  • Versant DB driver packaged as a module (not in the ear).

Issue

  • A heap dump is being generated (as a result of the -XX:+HeapDumpOnOutOfMemoryError JVM option) after running out of PermGen/Metaspace space (OutOfMemoryError: PermGen space or java.lang.OutOfMemoryError: Metaspace ).
  • Inspection of the heap dump shows a classloader not able to be collected due to references to Versant classes:
----------------------------------------------------------------------------------------------------------------------------------------------------
org.jboss.modules.ModuleClassLoader @ 0x6e7859bf0                                                                    |         88 B |     446.57 KB
|- <classloader> class com.example.entity.MyClass @ 0x6da51c6f0|         16 B |          16 B
|  |- runtimeClass com.versant.jpa.metadata.ClassMetaDataImpl @ 0x6e690a520                                          |        184 B |       2.90 KB
|  |- clazz com.versant.jpa.core.ObjectFactoryImpl @ 0x6e690f098                                                     |         24 B |          24 B
|  |  '- factory com.versant.jpa.metadata.ClassMetaDataImpl @ 0x6e690a520                                            |        184 B |       2.90 KB
|  |     |- value java.util.HashMap$Entry @ 0x6e690a500                                                              |         32 B |          32 B
|  |     |  '- [6179] java.util.HashMap$Entry[16384] @ 0x6de5d2f50                                                   |     64.02 KB |     271.73 KB
|  |     |     '- table java.util.HashMap @ 0x6de5c2648                                                              |         48 B |     335.84 KB
|  |     |        |- entityName2ClassMetadata com.versant.jpa.core.MetadataController$3 @ 0x6de5c2628                |         32 B |      35.18 MB
-------------------------------------------------------------------------------------------------------------------------------------------------

Resolution

Proposed fix for EAP 6.4.11:
This content is not included.This content is not included.https://bugzilla.redhat.com/show_bug.cgi?id=1387316

Root Cause

  1. Local issue with EJB CMT endTranaction()
    Content from issues.jboss.org is not included.Content from issues.jboss.org is not included.https://issues.jboss.org/browse/WFLY-6214

  2. Remote - Race condition when the imported TX is rolled back by the reaper before the remote reaper
    Content from issues.jboss.org is not included.Content from issues.jboss.org is not included.https://issues.jboss.org/browse/JBTM-2774

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