Use of the QueryPlanCache in Hibernate

Solution Verified - Updated -

Issue

  • Seeing QueryPlanCache memory allocated for each SessionFactory
Class Name                                                                        | Shallow Heap | Retained Heap
-----------------------------------------------------------------------------------------------------------------
org.hibernate.internal.SessionFactoryImpl @ 0x74d23b140                           |          144 |     8,567,184
|  ...
|- queryPlanCache org.hibernate.engine.query.spi.QueryPlanCache @ 0x74d8fe640     |           24 |       205,328
-----------------------------------------------------------------------------------------------------------------
  • JVM crashes because of "OutOfMemory" exceptions where significant memory is retained in the QueryPlanCache
  • Is the QueryPlanCache related to query (result) caching or level 2 caching?
  • Should we disable the QueryPlanCache?

Environment

  • Red Hat Enterprise Application Platform (EAP) 6
  • Hibernate 4

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