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  1. JBoss Enterprise Application Platform 4 and 5
  2. JBPAPP-10276

HHH-7629 Initialize PersistentCollection with fetchType LAZY returns NPE

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      @JoinTable(name = "JOIN_TABLE", joinColumns =

      { @JoinColumn(name = "JOIN_TABLE_ID", referencedColumnName = "ID") }

      , inverseJoinColumns =

      { @JoinColumn(name = "ENTITY_ID", referencedColumnName = "ID") }

      )
      @ManyToMany(fetch = FetchType.LAZY)
      private Set<JoinTable> aProperty;

      When fetching this entity, and after initialize, I get all the valid attribute values but the aProperty is defined as PersistenceCollection.

      This collection is not intialized yet. When I initialize this collection as follow:

      (PersistentCollection) entity).forceInitialization();

      Or

      Hibernate.initialize(entity);

      I got NullPointerException:

      Caused by: java.lang.NullPointerException
      at org.hibernate.engine.internal.StatefulPersistenceContext.getLoadedCollectionOwnerOrNull(StatefulPersistenceContext.java:790)
      at org.hibernate.event.spi.AbstractCollectionEvent.getLoadedOwnerOrNull(AbstractCollectionEvent.java:75)
      at org.hibernate.event.spi.InitializeCollectionEvent.<init>(InitializeCollectionEvent.java:36)
      at org.hibernate.internal.SessionImpl.initializeCollection(SessionImpl.java:1803)
      at org.hibernate.collection.internal.AbstractPersistentCollection.forceInitialization(AbstractPersistentCollection.java:489)
      at org.hibernate.Hibernate.initialize(Hibernate.java:77)

      When I check source code of class org.hibernate.engine.internal.StatefulPersistenceContext.getLoadedCollectionOwnerOrNull(StatefulPersistenceContext.java:790)

      CollectionEntry ce = getCollectionEntry( collection );
      790 if ( ce.getLoadedPersister() == null )

      { 791 return null; // early exit... 792 }

      Looks like the CollectionEntry ce is null. This collection entry is fetched from collectionEntries.get(coll);

      // Identity map of CollectionEntry instances, by the collection wrapper
      121 private IdentityMap<PersistentCollection, CollectionEntry> collectionEntries;

      I checked Jboss docs, it mentioned the way to initilialize the collection is as I have done above.
      http://docs.jboss.org/hibernate/orm/3.3/reference/en/html/performance.html#performance-fetching-initialization

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              rhn-support-trogers Travis Rogers (Inactive)
              rhn-support-trogers Travis Rogers (Inactive)
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                Updated:
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