Caused by: java.lang.NullPointerException
	at org.hibernate.collection.internal.AbstractPersistentCollection$1.doWork(AbstractPersistentCollection.java:164)
	at org.hibernate.collection.internal.AbstractPersistentCollection$1.doWork(AbstractPersistentCollection.java:157)

	protected boolean readSize() {
		if ( !initialized ) {
			if ( cachedSize != -1 && !hasQueuedOperations() ) {
				return true;
			}
			else {
				final boolean isExtraLazy = withTemporarySessionIfNeeded(
						new LazyInitializationWork<Boolean>() {
							@Override
							public Boolean doWork() {
								final CollectionEntry entry = session.getPersistenceContext().getCollectionEntry( AbstractPersistentCollection.this );

								if ( entry != null ) {
									final CollectionPersister persister = entry.getLoadedPersister();
									if ( persister.isExtraLazy() ) {
										if ( hasQueuedOperations() ) {