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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)