Single Table Inheritance Strategy causes errors when reading entities from the
database (discriminator problem)
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Key: OPENJPA-494
URL: https://issues.apache.org/jira/browse/OPENJPA-494
Project: OpenJPA
Issue Type: Bug
Affects Versions: 1.0.1, 1.0.0
Environment: Windows XP, Java 5.0 IBM
Reporter: Przemyslaw Koprowski
Attachments: SingleTableDiscriminatorProblem.zip
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)
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