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

[Greg Adams (JIRA)]

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.

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