Classloader Issues with Hibernate and UseJBossWebLoader

[mtb2ride]

I have 3 war files each using hibernate. Each has its own separate hibernate configuration in WEB-INF/classes/hibernate.cfg.xml. When I use the out-of-box Jboss, the first webapp that I test finds the necessary hibernate resources and everything is fine. Upon execution of the second or third webapp, HibernateExceptions occur in my queries leading me to believe resources for the second webapp are not loaded properly.

Looking at other posts regarding class loading issues in war files, I see recommendations to configure the UseJBossWebLoader to "false" in jbossweb-tomcat.sar/META-INF/jboss-service.xml. Apparently this should isolate my war classloaders. But when I try this I get java.lang.NoClassDefFoundError for the first Hibernate class I try to load. Strangely, the hibernate2.jar is packaged in WEB-INF/lib in each of the wars.

Besides setting UseJBossWebLoader to "false", what else should I do to isolate my wars but ensure the hibernate classes are found?


I've read several posts regarding Jboss classloader issues and the JBoss unified classloader including:

http://www.jboss.org/index.html?module=bb&op=viewtopic&t=43462
http://www.jboss.org/index.html?module=bb&op=viewtopic&t=41379
http://www.jboss.org/index.html?module=bb&op=viewtopic&t=44256

Steve

[mtb2ride]

Sorry, I didn't state my configuration.

I have this problem in Jboss 3.2.2 and 3.2.3 using the embedded tomcat.

Thanks,
Steve

[mtb2ride]

Once again, I've missed some detail. This classloading issue was repeatable on

1. Jboss 3.2.2 and Jboss 3.2.3 on Redhat Linux 7.2 with J2SDK 1.4.1_05
2. Jboss 3.2.3 on Windows 2K with 1.4.2

Thanks
Steve

[mtb2ride]

PROBLEM SOLVED at least for the time being

We had a utility jar in our server's lib/ directory. The utility jar containted some common infastructure for accessing Hibernate. We moved the utility jar out of the server lib and packaged it in each of our wars. We also had an ejb client jar that needed to be moved into the wars. After making these package changes and setting UseJBossWebLoader to "false" each webapp runs independently without errors.