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I've been trying to run an application but anytime I try I get this error I found in the forum that this is related with the class loader (jboss uses the tomcat class loader) and the nly thing I need to do is to use the jboss native class loader, the problem is that when I use that class loader I get more exceptions. This is urgent, I spent the whole day with this problem.

Hibernate version:
3.1 on Jboss 4.0.3SP1

Mapping documents:

Code between sessionFactory.openSession() and session.close():

Full stack trace of any exception that occurs:
17:48:24,312 INFO [NamingHelper] JNDI InitialContext properties:{}
17:48:24,359 WARN [AbstractEngine] Tapestry unable to begin processing request.
java.lang.ClassCastException: org.jboss.tm.TxManager
at org.hibernate.transaction.JNDITransactionManagerLookup.getTransactionManager(JNDITransactionManagerLookup.java:23)
at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:301)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1154)
at net.edesa.r166.common.HibernateUtil.getSessionFactory(HibernateUtil.java:173)
at net.edesa.r166.common.HibernateUtil.getSession(HibernateUtil.java:259)
at net.edesa.r166.tapestry.LongSessionEngine.setupForRequest(LongSessionEngine.java:27)
at org.apache.tapestry.engine.AbstractEngine.service(AbstractEngine.java:841)
at org.apache.tapestry.ApplicationServlet.doService(ApplicationServlet.java:198)
at org.apache.tapestry.ApplicationServlet.doGet(ApplicationServlet.java:159)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:159)
at org.jboss.web.tomcat.tc5.session.ClusteredSessionValve.invoke(ClusteredSessionValve.java:81)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
at java.lang.Thread.run(Thread.java:595)

Name and version of the database you are using:
Oracle 9i

The generated SQL (show_sql=true):

Debug level Hibernate log excerpt:

This kind of problems beacause the unexpected behaviour of JBoss when the same package is deployed more than once. Check if the ear included the hibernate3.jar and delete it from the ear