We're upgrading from JBoss 3.2.3 to JBoss 4.0.2.  We have lots of ears with 
wars and ejb jars, as well as some standalone wars, and a hibernate.sar.

We'd like to enable isolation.  However, we've discovered a lot of classpath 
issues that were hidden by 3.2.3's non-compliance.  It's often clear when one 
module is "reaching" into another module or ear when you remove the one it is 
undesirably obtaining the class from.  What's baffling though is that once you 
do this the verifier doesn't always appear to be able to resolve classes in its 
module's own path!

In one case, we have a war that is finding a class in another ear.  If you 
remove the ear from the deploy folder and restart JBoss, the war fails to 
deploy because it can't find the class, although the class is clearly in a jar 
in its WEB-INF/lib folder!

In another case an ear can't find a class in the ear's lib folder, even though 
it's correctly declared in the ejb module's manifest.mf.

In both of these cases, they find the class in another module, ear or sar if 
you deploy them first.  

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