[OPENJPA-494] Single Table Inheritance Strategy causes errors when reading entities from the database (discriminator problem)

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.0.0, 1.0.1, 1.1.0
• Fix Version/s: 1.2.0
• Environment: Windows XP, Java 5.0 IBM
• Assignee: Pinaki Poddar
• Reporter: Przemek Koprowski
• Created: 16/Jan/08 09:31
• Updated: 09/Mar/10 18:32
• Resolved: 17/Jul/08 12:50

Description

It appears that versions from 1.0 don't handle correctly discriminating objects received from the datastore when the inheritance strategy is set to SINGLE_TABLE.

Error I receive from test cases (attached):

<openjpa-1.0.1-r420667:592145 nonfatal user error> org.apache.openjpa.persistence.ArgumentException: Cannot load object with id "2". Instance "jpa.Admin-2" with the same id already exists in the L1 cache. This can occur when you assign an existing id to a new instance, and before flushing attempt to load the existing instance for that id.
FailedObject: jpa.Admin-2

This problem doesn't occur in OpenJPA version 0.9.7.

Trace:
<openjpa-1.0.1-r420667:592145 nonfatal user error> org.apache.openjpa.persistence.ArgumentException: Cannot load object with id "2". Instance "jpa.Admin-2" with the same id already exists in the L1 cache. This can occur when you assign an existing id to a new instance, and before flushing attempt to load the existing instance for that id.
FailedObject: jpa.Admin-2
at org.apache.openjpa.kernel.BrokerImpl$ManagedCache.add(BrokerImpl.java:4444)
at org.apache.openjpa.kernel.BrokerImpl.setStateManager(BrokerImpl.java:3779)
at org.apache.openjpa.kernel.StateManagerImpl.initialize(StateManagerImpl.java:303)
at org.apache.openjpa.kernel.StateManagerImpl.initialize(StateManagerImpl.java:264)
at org.apache.openjpa.jdbc.kernel.JDBCStoreManager.initializeState(JDBCStoreManager.java:330)
at org.apache.openjpa.jdbc.kernel.JDBCStoreManager.initialize(JDBCStoreManager.java:255)
at org.apache.openjpa.kernel.DelegatingStoreManager.initialize(DelegatingStoreManager.java:111)
at org.apache.openjpa.kernel.ROPStoreManager.initialize(ROPStoreManager.java:57)
at org.apache.openjpa.kernel.BrokerImpl.initialize(BrokerImpl.java:843)
at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:801)
at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:723)
at org.apache.openjpa.jdbc.kernel.JDBCStoreManager.find(JDBCStoreManager.java:748)
at org.apache.openjpa.jdbc.meta.strats.RelationFieldStrategy.load(RelationFieldStrategy.java:570)
at org.apache.openjpa.jdbc.meta.FieldMapping.load(FieldMapping.java:802)
at org.apache.openjpa.jdbc.kernel.JDBCStoreManager.load(JDBCStoreManager.java:485)
at org.apache.openjpa.kernel.DelegatingStoreManager.load(DelegatingStoreManager.java:116)
at org.apache.openjpa.kernel.ROPStoreManager.load(ROPStoreManager.java:78)
at org.apache.openjpa.kernel.StateManagerImpl.loadFields(StateManagerImpl.java:2867)
at org.apache.openjpa.kernel.StateManagerImpl.loadField(StateManagerImpl.java:2945)
at org.apache.openjpa.kernel.StateManagerImpl.beforeAccessField(StateManagerImpl.java:1449)
at org.apache.openjpa.kernel.StateManagerImpl.accessingField(StateManagerImpl.java:1434)
at jpa.RegularUser.pcGetadmin(RegularUser.java)
at jpa.RegularUser.getAdmin(RegularUser.java:16)
at TestCase.testL1ProductEasier(TestCase.java:38)