[OPENJPA-1375] OutOfMemory runs in container environment in a long stress run

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.3.0, 2.0.0-M3
• Fix Version/s: 1.3.0, 2.0.0-beta
• Component/s: kernel
• Assignee: Albert Lee
• Reporter: Albert Lee
• Created: 04/Nov/09 21:56
• Updated: 24/Feb/10 14:03
• Resolved: 06/Nov/09 15:48

Description

Long stress run in the app server/container environment caused a OutOfMemoery exception with a heap dump that showed the following:

FetchConfigurationImpl$ConfigurationState
+ WsJpaFetchConfigurationImpl
+ Array of Object
+ IdentityHashMap
+ EntityManagerImpl

What happened is the container pooled the entity manager and clear the context when a transaction is completed. However the IdentityHashMap in EntityManagerImpl, which maps the fetch configuration to fetch plan, is not being flush/clear. This caused the growth of the IdentityHashMap and eventually the OOM in a long run.