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

[Tyler Van Gorder (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-2326?page=comments#action_25739 ] 

Tyler Van Gorder commented on HHH-2326:
---------------------------------------

To further comment on this issue, we are getting a null pointer exception when:

a) we have a composite key with one of the attributes of the key being an FK to another persistent class.
b) The other persistent class has an ID field whose value is being generated.
c) The instance of the other persistent class is transient (does not yet have an ID)


We do not get the null pointer if we explicitly set the ID (generator=assigned)



> NullPointerException from merge on composite id
> -----------------------------------------------
>
>          Key: HHH-2326
>          URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2326
>      Project: Hibernate3
>         Type: Bug

>   Components: core
>     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.

-- 
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators:
   http://opensource.atlassian.com/projects/hibernate/secure/Administrators.jspa
-
For more information on JIRA, see:
   http://www.atlassian.com/software/jira