Program: 68004
Project: 68004
Buggy source:
/** 
 * INTERNAL: Merge changes from the source to the target object. This merge is only called when a changeSet for the target does not exist or the target is uninitialized
 */
public void mergeIntoObject(Object target,boolean isTargetUnInitialized,Object source,MergeManager mergeManager){
  if (isTargetUnInitialized) {
    if (mergeManager.shouldMergeWorkingCopyIntoOriginal() && (!isAttributeValueInstantiated(source))) {
      setAttributeValueInObject(target,getIndirectionPolicy().getOriginalIndirectionObject(getAttributeValueFromObject(source),mergeManager.getSession()));
      return;
    }
  }
  if (!shouldMergeCascadeReference(mergeManager)) {
    return;
  }
  if (mergeManager.shouldRefreshRemoteObject() && usesIndirection()) {
    mergeRemoteValueHolder(target,source,mergeManager);
    return;
  }
  if (mergeManager.shouldMergeOriginalIntoWorkingCopy()) {
    if (!isAttributeValueInstantiated(target)) {
      Object attributeValue=getAttributeValueFromObject(source);
      Object clonedAttributeValue=getIndirectionPolicy().cloneAttribute(attributeValue,source,target,(UnitOfWorkImpl)mergeManager.getSession(),false);
      setAttributeValueInObject(target,clonedAttributeValue);
      return;
    }
  }
 else   if (!isAttributeValueInstantiatedOrChanged(source)) {
    return;
  }
  Object valueOfSource=getRealCollectionAttributeValueFromObject(source,mergeManager.getSession());
  AbstractSession mergeSession=mergeManager.getSession();
  Object valueOfTarget=getRealCollectionAttributeValueFromObject(target,mergeSession);
  ContainerPolicy containerPolicy=getContainerPolicy();
  containerPolicy.sizeFor(valueOfTarget);
  boolean fireChangeEvents=false;
  if (!mergeManager.shouldMergeOriginalIntoWorkingCopy()) {
    Object newContainer=containerPolicy.containerInstance(containerPolicy.sizeFor(valueOfSource));
    if ((this.descriptor.getObjectChangePolicy().isObjectChangeTrackingPolicy()) && (target instanceof ChangeTracker) && (((ChangeTracker)target)._persistence_getPropertyChangeListener() != null)) {
      fireChangeEvents=true;
      Object iterator=containerPolicy.iteratorFor(valueOfTarget);
      PropertyChangeListener listener=((ChangeTracker)target)._persistence_getPropertyChangeListener();
      while (containerPolicy.hasNext(iterator)) {
        ((ObjectChangeListener)listener).internalPropertyChange(new CollectionChangeEvent(target,getAttributeName(),valueOfTarget,containerPolicy.next(iterator,mergeSession),CollectionChangeEvent.REMOVE));
      }
      if (newContainer instanceof ChangeTracker) {
        ((CollectionChangeTracker)newContainer).setTrackedAttributeName(getAttributeName());
        ((CollectionChangeTracker)newContainer)._persistence_setPropertyChangeListener(listener);
      }
      if (valueOfTarget instanceof ChangeTracker) {
        ((ChangeTracker)valueOfTarget)._persistence_setPropertyChangeListener(null);
      }
    }
    valueOfTarget=newContainer;
  }
 else {
    setRealAttributeValueInObject(target,containerPolicy.containerInstance(containerPolicy.sizeFor(valueOfSource)));
    containerPolicy.clear(valueOfTarget);
  }
synchronized (valueOfSource) {
    Object sourceIterator=containerPolicy.iteratorFor(valueOfSource);
    while (containerPolicy.hasNext(sourceIterator)) {
      Object object=containerPolicy.next(sourceIterator,mergeManager.getSession());
      if (object == null) {
        continue;
      }
      if (shouldMergeCascadeParts(mergeManager)) {
        if ((mergeManager.getSession().isUnitOfWork()) && (((UnitOfWorkImpl)mergeManager.getSession()).getUnitOfWorkChangeSet() != null)) {
          mergeManager.mergeChanges(mergeManager.getObjectToMerge(object),(ObjectChangeSet)((UnitOfWorkImpl)mergeManager.getSession()).getUnitOfWorkChangeSet().getObjectChangeSetForClone(object));
        }
 else {
          mergeManager.mergeChanges(mergeManager.getObjectToMerge(object),null);
        }
      }
      object=this.referenceDescriptor.getObjectBuilder().wrapObject(mergeManager.getTargetVersionOfSourceObject(object),mergeManager.getSession());
synchronized (valueOfTarget) {
        if (fireChangeEvents) {
          ((ObjectChangeListener)((ChangeTracker)target)._persistence_getPropertyChangeListener()).internalPropertyChange(new CollectionChangeEvent(target,getAttributeName(),valueOfTarget,object,CollectionChangeEvent.ADD));
        }
        containerPolicy.addInto(object,valueOfTarget,mergeManager.getSession());
      }
    }
    if (fireChangeEvents && (this.descriptor.getObjectChangePolicy().isAttributeChangeTrackingPolicy())) {
      ObjectChangeSet changeSet=((AttributeChangeListener)((ChangeTracker)target)._persistence_getPropertyChangeListener()).getObjectChangeSet();
      if (changeSet != null) {
        CollectionChangeRecord changeRecord=(CollectionChangeRecord)changeSet.getChangesForAttributeNamed(getAttributeName());
        if (changeRecord != null) {
          if (!changeRecord.isDeferred()) {
            if (!changeRecord.hasChanges()) {
              changeSet.removeChange(getAttributeName());
            }
          }
 else {
            changeRecord.setLatestCollection(valueOfTarget);
          }
        }
      }
    }
  }
  setRealAttributeValueInObject(target,valueOfTarget);
}

Fixed version (ground truth):
/** 
 * INTERNAL: Merge changes from the source to the target object. This merge is only called when a changeSet for the target does not exist or the target is uninitialized
 */
public void mergeIntoObject(Object target,boolean isTargetUnInitialized,Object source,MergeManager mergeManager){
  if (isTargetUnInitialized) {
    if (mergeManager.shouldMergeWorkingCopyIntoOriginal() && (!isAttributeValueInstantiated(source))) {
      setAttributeValueInObject(target,getIndirectionPolicy().getOriginalIndirectionObject(getAttributeValueFromObject(source),mergeManager.getSession()));
      return;
    }
  }
  if (!shouldMergeCascadeReference(mergeManager)) {
    return;
  }
  if (mergeManager.shouldRefreshRemoteObject() && usesIndirection()) {
    mergeRemoteValueHolder(target,source,mergeManager);
    return;
  }
  if (mergeManager.shouldMergeOriginalIntoWorkingCopy()) {
    if (!isAttributeValueInstantiated(target)) {
      Object attributeValue=getAttributeValueFromObject(source);
      Object clonedAttributeValue=getIndirectionPolicy().cloneAttribute(attributeValue,source,target,(UnitOfWorkImpl)mergeManager.getSession(),false);
      setAttributeValueInObject(target,clonedAttributeValue);
      return;
    }
  }
 else   if (!isAttributeValueInstantiatedOrChanged(source)) {
    return;
  }
  Object valueOfSource=getRealCollectionAttributeValueFromObject(source,mergeManager.getSession());
  AbstractSession mergeSession=mergeManager.getSession();
  Object valueOfTarget=getRealCollectionAttributeValueFromObject(target,mergeSession);
  ContainerPolicy containerPolicy=getContainerPolicy();
  containerPolicy.sizeFor(valueOfTarget);
  boolean fireChangeEvents=false;
  if (!mergeManager.shouldMergeOriginalIntoWorkingCopy()) {
    Object newContainer=containerPolicy.containerInstance(containerPolicy.sizeFor(valueOfSource));
    if ((this.descriptor.getObjectChangePolicy().isObjectChangeTrackingPolicy()) && (target instanceof ChangeTracker) && (((ChangeTracker)target)._persistence_getPropertyChangeListener() != null)) {
      fireChangeEvents=valueOfSource != valueOfTarget;
      Object iterator=containerPolicy.iteratorFor(valueOfTarget);
      PropertyChangeListener listener=((ChangeTracker)target)._persistence_getPropertyChangeListener();
      if (fireChangeEvents) {
        while (containerPolicy.hasNext(iterator)) {
          ((ObjectChangeListener)listener).internalPropertyChange(new CollectionChangeEvent(target,getAttributeName(),valueOfTarget,containerPolicy.next(iterator,mergeSession),CollectionChangeEvent.REMOVE));
        }
      }
      if (newContainer instanceof ChangeTracker) {
        ((CollectionChangeTracker)newContainer).setTrackedAttributeName(getAttributeName());
        ((CollectionChangeTracker)newContainer)._persistence_setPropertyChangeListener(listener);
      }
      if (valueOfTarget instanceof ChangeTracker) {
        ((ChangeTracker)valueOfTarget)._persistence_setPropertyChangeListener(null);
      }
    }
    valueOfTarget=newContainer;
  }
 else {
    setRealAttributeValueInObject(target,containerPolicy.containerInstance(containerPolicy.sizeFor(valueOfSource)));
    containerPolicy.clear(valueOfTarget);
  }
synchronized (valueOfSource) {
    Object sourceIterator=containerPolicy.iteratorFor(valueOfSource);
    while (containerPolicy.hasNext(sourceIterator)) {
      Object object=containerPolicy.next(sourceIterator,mergeManager.getSession());
      if (object == null) {
        continue;
      }
      if (shouldMergeCascadeParts(mergeManager)) {
        if ((mergeManager.getSession().isUnitOfWork()) && (((UnitOfWorkImpl)mergeManager.getSession()).getUnitOfWorkChangeSet() != null)) {
          mergeManager.mergeChanges(mergeManager.getObjectToMerge(object),(ObjectChangeSet)((UnitOfWorkImpl)mergeManager.getSession()).getUnitOfWorkChangeSet().getObjectChangeSetForClone(object));
        }
 else {
          mergeManager.mergeChanges(mergeManager.getObjectToMerge(object),null);
        }
      }
      object=this.referenceDescriptor.getObjectBuilder().wrapObject(mergeManager.getTargetVersionOfSourceObject(object),mergeManager.getSession());
synchronized (valueOfTarget) {
        if (fireChangeEvents) {
          ((ObjectChangeListener)((ChangeTracker)target)._persistence_getPropertyChangeListener()).internalPropertyChange(new CollectionChangeEvent(target,getAttributeName(),valueOfTarget,object,CollectionChangeEvent.ADD));
        }
        containerPolicy.addInto(object,valueOfTarget,mergeManager.getSession());
      }
    }
    if (fireChangeEvents && (this.descriptor.getObjectChangePolicy().isAttributeChangeTrackingPolicy())) {
      ObjectChangeSet changeSet=((AttributeChangeListener)((ChangeTracker)target)._persistence_getPropertyChangeListener()).getObjectChangeSet();
      if (changeSet != null) {
        CollectionChangeRecord changeRecord=(CollectionChangeRecord)changeSet.getChangesForAttributeNamed(getAttributeName());
        if (changeRecord != null) {
          if (!changeRecord.isDeferred()) {
            if (!changeRecord.hasChanges()) {
              changeSet.removeChange(getAttributeName());
            }
          }
 else {
            changeRecord.setLatestCollection(valueOfTarget);
          }
        }
      }
    }
  }
  setRealAttributeValueInObject(target,valueOfTarget);
}