java.lang.NullPointerException

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    • java.lang.NullPointerException at oracle.toplink.essentials.internal.queryframework.CollectionContainerPolicy.iteratorFor(CollectionContainerPolicy.java:172) at oracle.toplink.essentials.internal.helper.WriteLockManager.traverseRelatedLocks(WriteLockManager.java:171) at oracle.toplink.essentials.internal.helper.WriteLockManager.acquireLockAndRelatedLocks(WriteLockManager.java:149) at oracle.toplink.essentials.internal.helper.WriteLockManager.checkAndLockObject(WriteLockManager.java:378) at oracle.toplink.essentials.internal.helper.WriteLockManager.traverseRelatedLocks(WriteLockManager.java:186) at oracle.toplink.essentials.internal.helper.WriteLockManager.acquireLockAndRelatedLocks(WriteLockManager.java:149) at oracle.toplink.essentials.internal.helper.WriteLockManager.acquireLocksForClone(WriteLockManager.java:89) at oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl.cloneAndRegisterObject(UnitOfWorkImpl.java:669) at oracle.toplink.essentials.internal.sessions.UnitOfWorkIdentityMapAccessor.getAndCloneCacheKeyFromParent(UnitOfWorkIdentityMapAccessor.java:167) at oracle.toplink.essentials.internal.sessions.UnitOfWorkIdentityMapAccessor.getFromIdentityMap(UnitOfWorkIdentityMapAccessor.java:105) at oracle.toplink.essentials.internal.sessions.IdentityMapAccessor.getFromIdentityMap(IdentityMapAccessor.java:310) at oracle.toplink.essentials.internal.sessions.MergeManager.registerObjectForMergeCloneIntoWorkingCopy(MergeManager.java:674) at oracle.toplink.essentials.internal.sessions.MergeManager.mergeChangesOfCloneIntoWorkingCopy(MergeManager.java:411) at oracle.toplink.essentials.internal.sessions.MergeManager.mergeChanges(MergeManager.java:264) at oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl.mergeCloneWithReferences(UnitOfWorkImpl.java:2723) at oracle.toplink.essentials.internal.ejb.cmp3.base.RepeatableWriteUnitOfWork.mergeCloneWithReferences(RepeatableWriteUnitOfWork.java:219) at oracle.toplink.essentials.internal.ejb.cmp3.base.EntityManagerImpl.mergeInternal(EntityManagerImpl.java:235) at oracle.toplink.essentials.internal.ejb.cmp3.EntityManagerImpl.merge(EntityManagerImpl.java:128) at MainProgramManagement.ProgramMain.mergeData(ProgramMain.java:846) at MainProgramManagement.PersistenceDBManager.saveDataToDB(PersistenceDBManager.java:552)
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