In Hibernate when querying by natural id with query cache we receive a NullPointerException

Issue

• In our Parent object , we have collection called members, while adding a parent object, we have not faced any issue. While fetching the object and during collection intialiazation, we are getting following exception.

  private Object getObject( String key ) {
            Session session = HibernateUtil.getSessionFactory().getCurrentSession();
            session.beginTransaction();
            Criteria criteria = session.createCriteria( test.Parent.class );
            criteria.add( Restrictions.naturalId().set( "name", key ) );// No I18N
            criteria.setCacheable( true );
            Object obj = criteria.uniqueResult();
            Parent p=(Parent)obj;
            p.getMembers().size();
            session.getTransaction().commit();
            return obj;
  }
  
  
  
  EXCEPTION : java.lang.NullPointerException
  java.lang.NullPointerException
       at org.hibernate.engine.loading.CollectionLoadContext.addCollectionToCache(CollectionLoadContext.java:301)
       at org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:259)
       at org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:222)
       at org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:195)
       at org.hibernate.loader.Loader.endCollectionLoad(Loader.java:880)
       at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:865)
       at org.hibernate.loader.Loader.doQuery(Loader.java:729)
       at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
       at org.hibernate.loader.Loader.loadCollection(Loader.java:1994)
       at org.hibernate.loader.collection.CollectionLoader.initialize(CollectionLoader.java:36)
       at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:565)
       at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:63)
       at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1720)
       at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:347)
       at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
       at org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:110)
       at org.hibernate.collection.PersistentSet.size(PersistentSet.java:139)
       at test.TestManagerNew.getObject(TestManagerNew.java:69)
       at test.TestManagerNew.createAndStoreEvent(TestManagerNew.java:37)
       at test.TestManagerNew.main(TestManagerNew.java:23)