2:52 a.m.
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-2326?page=c...
]
Timo Thomas commented on HHH-2326:
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Hi. Finally I found someone else with this problem!
In my eyes, after some intensive testing, the error lies in the cascading of primary keys
to dependent (associated) entities. This doesn't seem to work for composite ids, if
those ids are foreign keys at the same time (as usual in join tables of
n:m-relationships). The exception above is thrown because the foreign key in the child
table hasn't been updated with the primary key of the parent table, and so it's
still NULL.
If someone consulted the "Java Persistence with Hibernate" Book, look at pages
304-307. The example, CategorizedItem.java, does not work if cascading is enabled like
page 307 says ("... enable transitive persistence with cascading options...").
An NPE is thrown. However, this is not covered by the book.
http://forum.hibernate.org/viewtopic.php?t=969289 relates to it (not my post).
If played around with the different annotation and implementation options for composite
ids (see page 330), but had no luck.
My suggested and working workaround is to create a single-column id (standard long or int,
Generation.AUTO), and adding a (composite) uniqueness constraint on the foreign keys.
Anyway, please fix this!
NullPointerException from merge on composite id
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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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