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I've been testing hibernate with JUnit and everything works fine, but when I'm trying to use it under JBoss I get the error int the stack trace, the problem is that I don't know which if the generators is the one who fail. I mean my clases use sequence but I'm also using JBPM which uses identity.

Please help me

Hibernate version:
3.0.1

Full stack trace of any exception that occurs:
org.hibernate.MappingException: could not instantiate id generator
at org.hibernate.id.IdentifierGeneratorFactory.create(IdentifierGeneratorFactory.java:97)
at org.hibernate.mapping.SimpleValue.createIdentifierGenerator(SimpleValue.java:152)
at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:181)
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)
Caused by: org.hibernate.MappingException: could not interpret id generator strategy:
at org.hibernate.id.IdentifierGeneratorFactory.getIdentifierGeneratorClass(IdentifierGeneratorFactory.java:108)
at org.hibernate.id.IdentifierGeneratorFactory.create(IdentifierGeneratorFactory.java:91)
... 31 more
Name and version of the database you are using:
Oracle 9i

Move this to the User forum. In addition, you will need to provide more information - mapping documents, code maybe, etc. Double check you do not have a spelling problem in one of the mapping documents for the generator value and / or you using an approrpriate generate in the context of its use.