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

[Timo Thomas (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-2326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_28987 ] 

Timo Thomas commented on HHH-2326:
----------------------------------

I must correct myself again. This exception isn't thrown in my examples if I persist the entity on the other side of the association first. Here, this is LeafParent. LeafParent cascades merging operations to Association and vice versa. However, cascading from Association to LeafParent doesn't make sense, because LeafParent has to be created _before_ Association. Hibernate should report that and could throw more meaningful exceptions, but at last, I think it's working fine.



> NullPointerException from merge on composite id
> -----------------------------------------------
>
>                 Key: HHH-2326
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2326
>             Project: Hibernate3
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 3.2.1
>         Environment: Hibernate 3.2.1ga, tested against Oracle 10g and Derby
>            Reporter: Greg Adams
>            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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