[Hibernate-issues] [Hibernate-JIRA] Created: (HHH-1914) session.merge(persistentEntity) fails on unmodifiable collections

[Emmanuel B. (JIRA) <no...@at...>]

session.merge(persistentEntity) fails on unmodifiable collections
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         Key: HHH-1914
         URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1914
     Project: Hibernate3
        Type: Bug

  Components: core  
    Reporter: Emmanuel Bernard
    Priority: Minor


		Cat cat = new Cat();
		cat.setId( new CatPk() );
		cat.getId().setName( "titi" );
		cat.getId().setThoroughbred( "unknown" );
		Set<Woman> women = new HashSet<Woman>();
		Woman woman = new Woman();
		woman.setId( new WomanPk() );
		woman.getId().setFirstName( "Lady" );
		woman.getId().setLastName( "McBeth" );
		women.add( woman );
		cat.setHumanContacts( Collections.unmodifiableSet( women ) );
		Set<Cat> cats = new HashSet<Cat>();
		cats.add( cat );
		woman.setCats( Collections.unmodifiableSet(cats) );
		s.persist( cat );
		s.persist( woman );
		tx.commit();
		s.merge( woman );

During merge, the entity is copied into itself (?)
defaultmergeeventlistener.entityIsPersistent() => copyValues(persister, entity, entity, source, copyCache);

java.lang.UnsupportedOperationException
	at java.util.Collections$UnmodifiableCollection.clear(Collections.java:1037)
	at org.hibernate.collection.PersistentSet.clear(PersistentSet.java:247)
	at org.hibernate.type.CollectionType.replaceElements(CollectionType.java:404)
	at org.hibernate.type.CollectionType.replace(CollectionType.java:449)
	at org.hibernate.type.TypeFactory.replace(TypeFactory.java:437)
	at org.hibernate.event.def.DefaultMergeEventListener.copyValues(DefaultMergeEventListener.java:282)
	at org.hibernate.event.def.DefaultMergeEventListener.entityIsPersistent(DefaultMergeEventListener.java:132)
	at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:105)
	at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:51)
	at org.hibernate.impl.SessionImpl.fireMerge(SessionImpl.java:677)
	at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:661)
	at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:665)
	at org.hibernate.test.annotations.manytomany.ManyToManyTest.testUnmodifiableCollection(ManyToManyTest.java:102)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at org.hibernate.test.annotations.TestCase.runTest(TestCase.java:67)
	at com.intellij.rt.execution.junit2.JUnitStarter.main(JUnitStarter.java:32)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:90)


What is the reason for that? The spec says that 
"If X is a managed entity, it is ignored by the merge operation"

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