[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-2326) NullPointerException from merge on composite id

[Stefan Winter (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-2326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=33972#action_33972 ] 

Stefan Winter commented on HHH-2326:
------------------------------------

Think i've got the same problem using 3.3.1 GA

Was able to point it down to follwing code in DefaultMergeEventListener [line: 215] - entityIsTransient(MergeEvent, Map):

		final Serializable id = persister.hasIdentifierProperty() ?
				persister.getIdentifier( entity, source.getEntityMode() ) :
		        null;

in my case changing it to that version helped:

		final Serializable id = persister.hasIdentifierProperty() ?
				persister.getIdentifier( entity, source.getEntityMode() ) :
		        entity;

I have a remaining doubt because the primary-key relationship-property from the child entity to it's parent does'nt get updated to the persistent parent.
Any way my unit tests seem to work now...



> NullPointerException from merge on composite id
> -----------------------------------------------
>
>                 Key: HHH-2326
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2326
>             Project: Hibernate Core
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 3.2.1
>         Environment: Hibernate 3.2.1ga, tested against Oracle 10g and Derby
>            Reporter: Greg Adams
>            Assignee: Diego Plentz
>            Priority: Critical
>         Attachments: HibernateMergeBug.zip
>
>
> Merge is throwing an NPE from the bowels of Hibernate when I have a class mapped with a composite ID.
> Stacktrace:
> [junit] java.lang.NullPointerException
>     [junit] 	at org.hibernate.type.AbstractType.getHashCode(AbstractType.java:112)
>     [junit] 	at org.hibernate.type.AbstractType.getHashCode(AbstractType.java:120)
>     [junit] 	at org.hibernate.type.EntityType.getHashCode(EntityType.java:279)
>     [junit] 	at org.hibernate.type.ComponentType.getHashCode(ComponentType.java:189)
>     [junit] 	at org.hibernate.engine.EntityKey.generateHashCode(EntityKey.java:104)
>     [junit] 	at org.hibernate.engine.EntityKey.<init>(EntityKey.java:48)
>     [junit] 	at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:100)
>     [junit] 	at org.hibernate.impl.SessionImpl.fireMerge(SessionImpl.java:687)
>     [junit] 	at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:669)
>     [junit] 	at org.hibernate.engine.CascadingAction$6.cascade(CascadingAction.java:245)
>     [junit] 	at org.hibernate.engine.Cascade.cascadeToOne(Cascade.java:268)
>     [junit] 	at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:216)
>     [junit] 	at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:169)
>     [junit] 	at org.hibernate.engine.Cascade.cascadeCollectionElements(Cascade.java:296)
>     [junit] 	at org.hibernate.engine.Cascade.cascadeCollection(Cascade.java:242)
>     [junit] 	at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:219)
>     [junit] 	at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:169)
>     [junit] 	at org.hibernate.engine.Cascade.cascade(Cascade.java:130)
>     [junit] 	at org.hibernate.event.def.AbstractSaveEventListener.cascadeAfterSave(AbstractSaveEventListener.java:437)
>     [junit] 	at org.hibernate.event.def.DefaultMergeEventListener.entityIsTransient(DefaultMergeEventListener.java:194)
>     [junit] 	at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:123)
>     [junit] 	at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:53)
>     [junit] 	at org.hibernate.impl.SessionImpl.fireMerge(SessionImpl.java:677)
>     [junit] 	at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:661)
>     [junit] 	at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:665)
>     [junit] 	at com.foo.test.HibernateTest.doMerge(Unknown Source)
>     [junit] 	at com.foo.test.HibernateTest.testInsert(Unknown Source)
>     [junit] 	at org.junit.internal.runners.TestMethodRunner.executeMethodBody(TestMethodRunner.java:99)
>     [junit] 	at org.junit.internal.runners.TestMethodRunner.runUnprotected(TestMethodRunner.java:81)
>     [junit] 	at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34)
>     [junit] 	at org.junit.internal.runners.TestMethodRunner.runMethod(TestMethodRunner.java:75)
>     [junit] 	at org.junit.internal.runners.TestMethodRunner.run(TestMethodRunner.java:45)
>     [junit] 	at org.junit.internal.runners.TestClassMethodsRunner.invokeTestMethod(TestClassMethodsRunner.java:71)
>     [junit] 	at org.junit.internal.runners.TestClassMethodsRunner.run(TestClassMethodsRunner.java:35)
>     [junit] 	at org.junit.internal.runners.TestClassRunner$1.runUnprotected(TestClassRunner.java:42)
>     [junit] 	at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34)
>     [junit] 	at org.junit.internal.runners.TestClassRunner.run(TestClassRunner.java:52)
>     [junit] 	at junit.framework.JUnit4TestAdapter.run(JUnit4TestAdapter.java:32)
> I've attached a zipped-up project that reproduces the error. Just extract and run ant.

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