L2 Cache and Long transactions Memory Leak : OutOfMemoryException ----------------------------------------------------------------- Key: HHH-2169 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2169 Project: Hibernate3 Type: Bug Components: core Versions: 3.2.0.ga Environment: [b]Hibernate version:[/b] Hibernate Entity Manager 3.2.0, with Hibernate Core 3.2.0 and Hibernate Annotations 3.2.0 [b]Mapping documents:[/b] Annotations [b]Full stack trace of any exception that occurs:[/b] Memory Heap Exception [b]Name and version of the database you are using:[/b] PosgreSQL 8.1 Reporter: Sami Dalouche Summary --------- When enabling L2 Cache (with either OScache and EhCache, both with a limitation on the max #of instances, so the problem shouldn't come from the cache manager), Hibernate cannot have long running transactions, otherwise, it results in a Memory Heap Exception... The problem does NOT happen if the L2 Cache is disabled ! Details ---------- - Configure the code to run in ONE transaction - Have a huge loop that inserts 2 million entries that are cacheable (@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)) - flush() and clear() every 1000 entries, to periodically flush the cache => None of the entries are garbage collected. => Using a profiler, it is possible to trace the owning objects of my domain classes to : - org.hibernate.action.EntityInsertAction ("instance" variable) - array / List (variable elementData) - variable "executions" in object .. class org.hibernate.engine.ActionQueue Remarks : - If the Query Cache is disabled, and the objects being inserted are NOT cacheable (no @Cache annotation), there is no problem - If the Query Cache is enabled, then, no matter whether the objects being inserted are cacheable or not, The entries are never garbage collected, and I get an OutOfMemoryException. (I see NO relationship between the Query Cache and my objects. I never query the objects, only save them !!) -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://opensource.atlassian.com/projects/hibernate/secure/Administrators.... - For more information on JIRA, see: http://www.atlassian.com/software/jira