[OPENJPA-2136] NPE when using LiteAutoDetach

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.0, 2.1.1, 2.2.0, 2.3.0
• Fix Version/s: 2.2.1, 2.3.0
• Component/s: kernel
• Assignee: Richard G. Curtis
• Reporter: Richard G. Curtis
• Created: 21/Feb/12 20:18
• Updated: 09/Oct/12 18:36
• Resolved: 21/Feb/12 21:28

Description

I encountered a NPE[2] today when using the LiteAutoDetach[1] configuration property. The steps required to cause this problem is as follows:

• Configure LiteAutoDetach for your PU.
• Find a non-transactional Entity.
• Clear the EntityManager.
• Begin / commit transaction.

The problem is that LiteAutoDetach doesn't properly clean up the EntityManager while it is performing lite detachment. State is left in BrokerImpl._pending set which is then incorrectly used post em.clear. It also appears that there are a number of other BrokerImpl datastructures that should have been cleaned up on clear / detachall.

[1] http://openjpa.apache.org/builds/latest/docs/docbook/manual.html#ref_guide_detach_state
[2] Caused by: <openjpa-2.2.0-SNAPSHOT-r422266:1244602 nonfatal general error> org.apache.openjpa.persistence.PersistenceException: null
at org.apache.openjpa.kernel.BrokerImpl.beforeCompletion(BrokerImpl.java:1998)
at org.apache.openjpa.kernel.LocalManagedRuntime.commit(LocalManagedRuntime.java:81)
at org.apache.openjpa.kernel.BrokerImpl.commit(BrokerImpl.java:1514)
at org.apache.openjpa.kernel.DelegatingBroker.commit(DelegatingBroker.java:933)
at org.apache.openjpa.persistence.EntityManagerImpl.commit(EntityManagerImpl.java:570)
... 24 more
Caused by: java.lang.NullPointerException
at org.apache.openjpa.Customer.pcProvideField(Customer.java)
at org.apache.openjpa.kernel.StateManagerImpl.provideField(StateManagerImpl.java:3161)
at org.apache.openjpa.kernel.StateManagerImpl.preFlush(StateManagerImpl.java:2980)
at org.apache.openjpa.kernel.PDirtyState.beforeFlush(PDirtyState.java:38)
at org.apache.openjpa.kernel.StateManagerImpl.beforeFlush(StateManagerImpl.java:1053)
at org.apache.openjpa.kernel.BrokerImpl.flush(BrokerImpl.java:2112)
at org.apache.openjpa.kernel.BrokerImpl.flushSafe(BrokerImpl.java:2072)
at org.apache.openjpa.kernel.BrokerImpl.beforeCompletion(BrokerImpl.java:1990)
... 28 more

Issue Links

• relates to: OPENJPA-1545 Add new Detach processing