We are seeing Hibernate store a lot of information in the Session (first level cache) and eventually see OutOfMemory exceptions.
Issue
- The application works fine for say 4 days at a stretch and then the JVM crashes with a OutofMemory error.
- We see a lot of memory being used by org/hibernate/
- We analyze this heap dump and we detect the high usage of org.hibernate.impl.SessionFactoryObjectFactory class (83% usage of memory).
Environment
- JBoss Enterprise Application Platform (EAP)
- 4
- 5
- 6
- 7
- Hibernate
- 3.3.x
- 5.3.x (bundled with JBoss EAP 7.4)
-
Heap analyzer shows for Hibernate 3.3:
692,139,472 (32%) [88] 14 org/hibernate/engine/StatefulPersistenceContext 0x5ede0268 659,080,192 (31%) [24] 3 org/hibernate/util/IdentityMap 0x5ede0678 659,080,144 (31%) [32] 3 org/apache/commons/collections/SequencedHashMap 0x5ede0690 24 (0%) [24] 1 array of java/util/Map$Entry 0x5ede0700 96 (0%) [32] 22 class org/hibernate/util/IdentityMap 0x37fb9238 27,924,656 (1%) [48] 2 java/util/HashMap 0x5ede02c0 27,924,608 (1%) [994,528] 248,627 array of java/util/HashMap$Entry 0x87bc1c38 640 (0%) [32] 4 java/util/HashMap$Entry 0x9a1a2708 560 (0%) [32] 4 java/util/HashMap$Entry 0x9b0365e8 560 (0%) [32] 4 java/util/HashMap$Entry 0xb19044c8 -
For Hibernate 5, in the dominator tree of Eclipse Memory Analyzer shows an instance of
org.hibernate.engine.internal.StatefulPersistenceContextwith a large retained heap:Class Name | Shallow Heap | Retained Heap | Percentage ----------------------------------------------------------------------------------------------------------------- org.hibernate.engine.internal.StatefulPersistenceContext @ 0xce342030| 104 | 173,365,848 | 16.86% '- entitiesByKey java.util.HashMap @ 0xce342098 | 48 | 173,364,592 | 16.86% -----------------------------------------------------------------------------------------------------------------
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