Map<PC, PC> with dependent key/value on delete of owner when optimistic txn can cause error

[andyjefferson]

Look at "test.jdo.application" DependentFieldTest "testDependentFieldsInverseMapsDeletion". This passes when using pessimistic transactions, but when switching to optimistic it causes

testDependentFieldsInverseMapsDeletion(org.datanucleus.tests.DependentFieldTest) Time elapsed: 0.463 sec <<< ERROR! javax.jdo.JDOUserException: Cannot write fields to a deleted object FailedObject:2 at org.datanucleus.api.jdo.state.PersistentDeleted.transitionWriteField(PersistentDeleted.java:126) at org.datanucleus.state.AbstractStateManager.transitionWriteField(AbstractStateManager.java:584) at org.datanucleus.state.JDOStateManagerImpl.preWriteField(JDOStateManagerImpl.java:4662) at org.datanucleus.state.JDOStateManagerImpl.setObjectField(JDOStateManagerImpl.java:2625) at org.datanucleus.state.JDOStateManagerImpl.setObjectField(JDOStateManagerImpl.java:2521) at org.datanucleus.store.mapped.scostore.FKMapStore.removeValue(FKMapStore.java:701) at org.datanucleus.store.mapped.scostore.FKMapStore.remove(FKMapStore.java:658) at org.datanucleus.store.mapped.scostore.FKMapStore.clear(FKMapStore.java:734) at org.datanucleus.store.types.sco.queued.ClearMapOperation.perform(ClearMapOperation.java:35) at org.datanucleus.store.types.sco.queued.ClearMapOperation.perform(ClearMapOperation.java:26) at org.datanucleus.store.types.sco.queued.OperationQueue.performAll(OperationQueue.java:137) at org.datanucleus.store.types.sco.backed.HashMap.flush(HashMap.java:248) at org.datanucleus.store.mapped.mapping.MapMapping.preDelete(MapMapping.java:250) at org.datanucleus.store.rdbms.request.DeleteRequest.execute(DeleteRequest.java:178) at org.datanucleus.store.rdbms.RDBMSPersistenceHandler.deleteTable(RDBMSPersistenceHandler.java:492) at org.datanucleus.store.rdbms.RDBMSPersistenceHandler.deleteObject(RDBMSPersistenceHandler.java:461) at org.datanucleus.state.JDOStateManagerImpl.internalDeletePersistent(JDOStateManagerImpl.java:4518) at org.datanucleus.state.JDOStateManagerImpl.flush(JDOStateManagerImpl.java:4868) at org.datanucleus.ObjectManagerImpl.flushInternal(ObjectManagerImpl.java:3227) at org.datanucleus.ObjectManagerImpl.flush(ObjectManagerImpl.java:3167) at org.datanucleus.ObjectManagerImpl.preCommit(ObjectManagerImpl.java:3308)

So it gets to the remove method where it will check on dependent key/value but then tries to delete the value. Probably needs to flush things to the datastore first