I didn't mean to say ClassNotFound, I meant NoClassDefFound. But yeah, I don't get it. Although, an idea just popped into my head. If you look at the stack trace, the error originates from a Hibernate class. I had the hibernate jar files in my server lib directory (because that's just how it was when I installed JBoss). So as I understand it, classes inside a war are isolated in that war. So if the Hibernate classes that reside outside the war are trying to setup the 2nd level cache stuff, and I put the jar that supports that (ehcache.jar) in the war, Hibernate won't be able to see that, and thus the error. Which means that instead of moving my jars out of the war, I could probably move the hibernate jars inside the war. I'll test that out.
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