[OPENJPA-1379] Locking problem when using timestamp QueryCache eviction policy.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.0-M3
• Fix Version/s: 2.0.0-beta
• Component/s: datacache
• Assignee: Richard G. Curtis
• Reporter: Richard G. Curtis
• Created: 09/Nov/09 20:47
• Updated: 09/Nov/09 22:10
• Resolved: 09/Nov/09 22:10

Description

I ran into a bug in AbstractQueryCache when using the timestamp QueryCache eviction policy. This is only a problem when running in a multithreaded environment.

The net of the problem is that in AbstractQueryCache.onTypesChanged(TypesChangedEvent ev) we call writeLock(), but when using the non-default eviction policy we never call writeUnlock(). As a result, any other threads requesting a writeLock on the cache will block indefinitely.

Issue Links

• is part of: OPENJPA-738 QueryCache Improvement