I am specifiying my mapping file using the <mapping jar="hibdefs.jar"> element in the my hibernate.cfg.xml file. When I initialize hibernate from within a session bean (packaged in an ear, deployed on JBoss 3.2.3), hibernate can't find the jar file. I've included the jar in the manifest's class-path and made sure it was packaged in the ear, but it still can't be found.

Using Hibernate 2.1.2 . Here's a snip of the stack trace

2004-03-11 14:17:05,978 DEBUG [net.sf.hibernate.cfg.Configuration] java:comp/env/hibernate/OraSessionFactory<-org.dom4j.tree.DefaultAttribute@18665a0 [Attribute: name jar value "/hibdefs.jar"]
2004-03-11 14:17:28,291 ERROR [org.arbfile.ejb.webrpt.sb.SBWebRptRequestBean] java.lang.NullPointerException
java.lang.NullPointerException
at net.sf.hibernate.cfg.Configuration.addJar(Configuration.java:346)
at net.sf.hibernate.cfg.Configuration.doConfigure(Configuration.java:981)
at net.sf.hibernate.cfg.Configuration.doConfigure(Configuration.java:928)
at net.sf.hibernate.cfg.Configuration.configure(Configuration.java:871)
at org.arbfile.util.hibernate.util.HibernateLoader.getSessionFactory(HibernateLoader.java:70)
at org.arbfile.util.hibernate.util.HibernateLoader.getSession(HibernateLoader.java:56)
at org.arbfile.ejb.webrpt.sb.SBWebRptRequestBean.addWebRptRequest(SBWebRptRequestBean.java:154)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionContainer.java:683)
at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:185)
at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:72)
at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:84)
at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:320)
at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:128)
at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:118)

where is your hibernate.jar located ? I dont know JBoss very well, but I know about class loader hierarchies:

If your hibernate.jar is in your server root classpath, then your hibdefs.jar must be on the same classpath (or on a classpath up in the class loader hierarchy), because hibernate.jar attempts to load classes from hibdefs.jar. maybee this helps...

It appears the location of the JAR file specified the <mapping> tag needs to be relative to the location of the hibernate.cfg.xml file. In my case, the hibernate.cfg.xml config file is located in WEB-INF/classes, so I have the following statement in my hibernate.cfg.xml:



This seems to work in both Tomcat (4.1.30) and Resin (3.0.6).

HTH,

Phil..

My hibernate2 jar and my hibdefs.jar are both in the root of my ear file just as are all other jar to be used by my EJB's. The ejb jar manifest lists all of these, including the hibdefs jar. I just tested using the following from within a SessionBean:

HibernateLoader.class.getResource("/hibdefs.jar");

HibernateLoader is a class I wrote. This finds the jar just fine.

The code in the hibernate Configuration class:

Thread.currentThread().getContextClassLoader().getResource(resource)

where resource = "/hibdefs.jar", returns null.

I included the same code in my Session bean and it returns null there as well.

Is this some weird app server classloading thing?