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MappingException: Unknown entity EntityName_$$_javassist_57

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goeh

Post subject: MappingException: Unknown entity EntityName_$$_javassist_57

Posted: Fri Jun 30, 2006 4:39 am

Newbie

Joined: Sun Oct 12, 2003 4:21 pm
Posts: 16
Location: Stockholm, Sweden

Hi, I'm in the end of converting my project from Hibernate2 to Hibernate3.
I can login and browse records, but as soon as I try to save/persist something I get an exception.
To me it sounds like a classloader/bytecode enhancer issue.
Can anyone point me in a direction where to investigate?

Hibernate version:
From the hibernate3.jar manifest:
Specification-Version: 4.0.4.GA
Implementation-Vendor-Id: http://www.jboss.org/
Hibernate-Version: 3.2.0.cr2
Implementation-Version: 3.2.0.cr2

Code between sessionFactory.openSession() and session.close():
Home made web framework ;-) Opening session at HTTP GET, closing it after a redirect. Maybe the problem is here, because the session disconnect/reconnect has changed between h2 and h3.
I'm right now investigating this, but could need all the help I can get.

Full stack trace of any exception that occurs:

Code:

10:16:03,415 ERROR [STDERR] Caused by: org.hibernate.MappingException: Unknown e
ntity: com.xyz.activity.ActivityType_$$_javassist_57
10:16:03,415 ERROR [STDERR]     at org.hibernate.impl.SessionFactoryImpl.getEnti
tyPersister(SessionFactoryImpl.java:547)
10:16:03,431 ERROR [STDERR]     at org.hibernate.event.def.DefaultLoadEventListe
ner.onLoad(DefaultLoadEventListener.java:65)
10:16:03,431 ERROR [STDERR]     at org.hibernate.impl.SessionImpl.fireLoad(Sessi
onImpl.java:871)
10:16:03,431 ERROR [STDERR]     at org.hibernate.impl.SessionImpl.load(SessionIm
pl.java:788)
10:16:03,431 ERROR [STDERR]     at org.hibernate.impl.SessionImpl.load(SessionIm
pl.java:781)

Thanks.

/Goran

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goeh

Post subject:

Posted: Fri Jun 30, 2006 5:26 am

Newbie

Joined: Sun Oct 12, 2003 4:21 pm
Posts: 16
Location: Stockholm, Sweden

Problem solved!!! (I hope)

I was trying to refresh an object from database (before updating it), in an over-complicated way:

Code:

else if (getModel().getId() != null) {
            // Refresh existing root entity.
            Class existingClass = getModel().getClass();
            String currentPrimaryKey = getModel().getId();
            if (log.isDebugEnabled()) {
                log.debug("Refreshing root entity: " + existingClass.getName()
                        + "@" + currentPrimaryKey);
            }
            setModel((AbstractEntity) session.load(existingClass,
                    currentPrimaryKey));
        }

The getClass() returned the enhanced class name and thus did not work with session.load().

I replaced all of this with a one-liner:

Code:

session.refresh(getModel());

And things started to work much better.
I have not tested everything yet, so I may run into other problems.

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