[OPENJPA-560] merge() throws NPE or unable to create proxy

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.1.0
• Environment: Linux 2.6, Java 1.5.0_12, Derby 10.3.2.1
• Assignee: Unassigned
• Reporter: Adam Hardy
• Created: 08/Apr/08 15:40
• Updated: 16/Jul/08 14:21

Description

I have reduced this to a stand-alone unit test and also tested it against Toplink and Hibernate, with which it works.

So I'm looking at a pure OpenJPA issue here.

Here is the low-down:

• Parent - child entities mapped using XML as opposed to annotations
• both inherit a mapped superclass
• both have a prepersist and preupdate listener configured
• not using enhancement

This is all I do:

EntityManager entityManager =
db.entityManagerFactory.createEntityManager();
entityManager.getTransaction().begin();
Genus genus = entityManager.find(Genus.class, new Long(1));
entityManager.getTransaction().commit();
entityManager.close();
// now detached
entityManager = db.entityManagerFactory.createEntityManager();
entityManager.getTransaction().begin();
entityManager.merge(genus);

and it throws an exception. If there is a child row in the db, I get the exception below.

If there is no child in existence, I get a NullPointerException.

If I enhance the entities, all is hunkydory.

This is using OpenJPA v1.1.0 snapshot from February.

$Proxy13 seems to be the name of the parent's child collection property, I can see from debugging.

<openjpa-1.1.0-SNAPSHOT-r420667:609825 fatal general error> org.apache.openjpa.persistence.PersistenceException: Unable to create a second class object proxy for final class "class $Proxy13".
at org.apache.openjpa.util.ProxyManagerImpl.assertNotFinal(ProxyManagerImpl.java:555)
at org.apache.openjpa.util.ProxyManagerImpl.generateProxyCollectionBytecode(ProxyManagerImpl.java:524)
at org.apache.openjpa.util.ProxyManagerImpl.getFactoryProxyCollection(ProxyManagerImpl.java:373)
at org.apache.openjpa.util.ProxyManagerImpl.copyCollection(ProxyManagerImpl.java:192)
at org.apache.openjpa.kernel.AttachStrategy.copyCollection(AttachStrategy.java:342)
at org.apache.openjpa.kernel.AttachStrategy.attachCollection(AttachStrategy.java:319)
at org.apache.openjpa.kernel.AttachStrategy.replaceList(AttachStrategy.java:357)
at org.apache.openjpa.kernel.AttachStrategy.attachField(AttachStrategy.java:222)
at org.apache.openjpa.kernel.VersionAttachStrategy.attach(VersionAttachStrategy.java:151)
at org.apache.openjpa.kernel.AttachManager.attach(AttachManager.java:241)
at org.apache.openjpa.kernel.AttachManager.attach(AttachManager.java:101)
at org.apache.openjpa.kernel.BrokerImpl.attach(BrokerImpl.java:3196)
at org.apache.openjpa.kernel.DelegatingBroker.attach(DelegatingBroker.java:1142)
at org.apache.openjpa.persistence.EntityManagerImpl.merge(EntityManagerImpl.java:736)
at org.permacode.atomictest.jpa.JpaSpeciesDao.persist(JpaSpeciesDao.java:81)