Hi,

We are using Hiberant 2.1.6 on Redhat linux running JDK1.5.0 and our DB is MaxDB. We have large object graphs that we load (sometimes up to 5 table joins). We are having the problem where the objects lower down in the graph are not fully created before being set in an object higher up in the graph. I will give an example:

Object A contains object B. Hibernate is mapped to load A and B together (not lazy).

When we load object A and hibernate calls A.setB(B) and A.setB() calls B.getX(), X is not been set and returns null even though it is set to not-null in the mapping. Basically, object B is being set before it is completely loaded/populated.

I have used this simple example because the amount of code and mappings is extensive for the problem.

One note: the problem is not consistent. Some mappings occurred all the time and we rewrote the way we mapped/created the object graphs. Now, it is occurring randomly where it occurs on say 10 objects in a list of 100.

I have a stack trace that shows the problem. The null pointer occurs because the hashCode() method uses a property of bay which is set to not-null, but it is null because it has not been set. If you need more information, please let me know. Thanks for any help.

[12:55:59.092] [ERROR] [PersistentCollection] - Failed to lazily initialize a collection
net.sf.hibernate.PropertyAccessException: Exception occurred inside setter of com.reddline.oms.picksystem.model.PickList.picks
at net.sf.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:49)
at net.sf.hibernate.persister.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:222)
at net.sf.hibernate.impl.SessionImpl.initializeEntity(SessionImpl.java:2210)
at net.sf.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:315)
at net.sf.hibernate.loader.Loader.doQuery(Loader.java:305)
at net.sf.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:133)
at net.sf.hibernate.loader.Loader.loadEntity(Loader.java:911)
at net.sf.hibernate.loader.Loader.loadEntity(Loader.java:931)
at net.sf.hibernate.loader.EntityLoader.load(EntityLoader.java:59)
at net.sf.hibernate.loader.EntityLoader.load(EntityLoader.java:51)
at net.sf.hibernate.persister.EntityPersister.load(EntityPersister.java:419)
at net.sf.hibernate.impl.SessionImpl.doLoad(SessionImpl.java:2117)
at net.sf.hibernate.impl.SessionImpl.doLoadByClass(SessionImpl.java:1991)
at net.sf.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:1953)
at net.sf.hibernate.type.ManyToOneType.resolveIdentifier(ManyToOneType.java:69)
at net.sf.hibernate.type.EntityType.resolveIdentifier(EntityType.java:204)
at net.sf.hibernate.impl.SessionImpl.initializeEntity(SessionImpl.java:2205)
at net.sf.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:315)
at net.sf.hibernate.loader.Loader.doQuery(Loader.java:305)
at net.sf.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:133)
at net.sf.hibernate.loader.Loader.loadCollection(Loader.java:990)
at net.sf.hibernate.loader.Loader.loadCollection(Loader.java:965)
at net.sf.hibernate.loader.OneToManyLoader.initialize(OneToManyLoader.java:93)
at net.sf.hibernate.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:284)
at net.sf.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:3268)
at net.sf.hibernate.collection.PersistentCollection.initialize(PersistentCollection.java:195)
at net.sf.hibernate.collection.PersistentCollection.read(PersistentCollection.java:71)
at net.sf.hibernate.collection.Set.iterator(Set.java:130)
at com.reddline.oms.picksystem.model.PickList.sortPicks(PickList.java:342)
at com.reddline.oms.picksystem.model.PickList.setPicks(PickList.java:90)
at sun.reflect.GeneratedMethodAccessor142.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at net.sf.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:38)
at net.sf.hibernate.persister.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:222)
at net.sf.hibernate.impl.SessionImpl.initializeEntity(SessionImpl.java:2210)
at net.sf.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:315)
at net.sf.hibernate.loader.Loader.doQuery(Loader.java:305)
at net.sf.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:133)
at net.sf.hibernate.loader.Loader.loadEntity(Loader.java:911)
at net.sf.hibernate.loader.Loader.loadEntity(Loader.java:931)
at net.sf.hibernate.loader.EntityLoader.load(EntityLoader.java:59)
at net.sf.hibernate.loader.EntityLoader.load(EntityLoader.java:51)
at net.sf.hibernate.persister.EntityPersister.load(EntityPersister.java:419)
at net.sf.hibernate.impl.SessionImpl.doLoad(SessionImpl.java:2117)
at net.sf.hibernate.impl.SessionImpl.doLoadByClass(SessionImpl.java:1991)
at net.sf.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:1953)
at net.sf.hibernate.type.ManyToOneType.resolveIdentifier(ManyToOneType.java:69)
at net.sf.hibernate.type.EntityType.resolveIdentifier(EntityType.java:204)
at net.sf.hibernate.impl.SessionImpl.initializeEntity(SessionImpl.java:2205)
at net.sf.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:315)
at net.sf.hibernate.loader.Loader.doQuery(Loader.java:305)
at net.sf.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:133)
at net.sf.hibernate.loader.Loader.doList(Loader.java:1033)
at net.sf.hibernate.loader.Loader.list(Loader.java:1024)
at net.sf.hibernate.loader.SQLLoader.list(SQLLoader.java:92)
at net.sf.hibernate.impl.SessionImpl.findBySQL(SessionImpl.java:3806)
at net.sf.hibernate.impl.SQLQueryImpl.list(SQLQueryImpl.java:52)
at net.sf.hibernate.impl.AbstractQueryImpl.uniqueResult(AbstractQueryImpl.java:550)
at com.reddline.oms.picksystem.model.PickSystemDataAccessor.getZone(PickSystemDataAccessor.java:107)
at com.reddline.oms.picksystem.PickSystem.onEvent(PickSystem.java:85)
at com.reddline.oms.eventsystem.AbstractEventSystem.fireEvent(AbstractEventSystem.java:160)
at com.reddline.oms.eventsystem.AbstractEventSystem.processEvent(AbstractEventSystem.java:139)
at com.reddline.oms.eventsystem.BasicEventSystem$1.run(BasicEventSystem.java:59)
at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:748)
at java.lang.Thread.run(Thread.java:595)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.GeneratedMethodAccessor142.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at net.sf.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:38)
... 65 more
Caused by: java.lang.NullPointerException
at com.reddline.oms.model.Bay.hashCode(Bay.java:281)
at java.util.HashMap.hash(HashMap.java:264)
at java.util.HashMap.getEntry(HashMap.java:360)
at java.util.LinkedHashMap.get(LinkedHashMap.java:273)
at com.reddline.oms.picksystem.model.PickList.addInactivePick(PickList.java:296)
at com.reddline.oms.picksystem.model.PickList.sortPicks(PickList.java:354)
at com.reddline.oms.picksystem.model.PickList.setPicks(PickList.java:90)
... 69 more