Hello,

Can I somehow turn the debug on to find out what exactly does this error refer to? I'm running Hibernate 3.1rc2 in Sun app server (8.2) under jdk 1.5. This error is so vague that it's hard to determine the problem.
Any ideas on the cause of the error or on how to make it more verbose would be greatly appreciated.
Regards,

Bratek


Caused by: java.lang.NullPointerException
at org.hibernate.tuple.AbstractEntityTuplizer.createProxy(AbstractEntityTuplizer.java:372)
at org.hibernate.persister.entity.AbstractEntityPersister.createProxy(AbstractEntityPersister.java:3120)
at org.hibernate.event.def.DefaultLoadEventListener.createProxyIfNecessary(DefaultLoadEventListener.java:232)
at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:173)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:87)
at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:809)
at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:781)
at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:266)
at org.hibernate.type.EntityType.resolve(EntityType.java:303)
at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:113)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:842)
at org.hibernate.loader.Loader.doQuery(Loader.java:717)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:223)
at org.hibernate.loader.Loader.doList(Loader.java:2147)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2026)
at org.hibernate.loader.Loader.list(Loader.java:2021)
at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:94)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1483)
at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:298)
at org.hibernate.impl.CriteriaImpl.uniqueResult(CriteriaImpl.java:431)

I'm having the same problem, running Hibernate 3.2.0.cr4, JDK 1.5, Derby 10.2.1.6 server:




Regards, Helmut

In my case, the problem was caused by older files copied earlier to Sun app server lib folder (domains/domain1/lib). As I was also including newer files in the build (EAR file), I guess classpath precedence was picking the older files first. I removed all files from domain1/lib folder and everything works fine now.

PS. Hibernate 3.2.0.rc5 causes a rather nasty error in conjunction with Sun app server:

[#|2006-10-12T11:55:51.006-0400|INFO|sun-appserver-pe8.2|org.hibernate.dialect.Dialect|_ThreadID=14;|Using dialect: org.hibernate.dialect.Oracle9Dialect|#]

#
# An unexpected error has been detected by HotSpot Virtual Machine:
#
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x6d6d78d6, pid=3408, tid=3144
#
# Java VM: Java HotSpot(TM) Client VM (1.5.0_06-b05 mixed mode)
# Problematic frame:
# C [zip.dll+0x78d6]
#
# An error report file with more information is saved as hs_err_pid3408.log
#
# If you would like to submit a bug report, please visit:
# http://java.sun.com/webapps/bugreport/crash.jsp
#


So if your Sun app server crashes out of a blue, you might see this one in your log file.