Weird classpath issue in EAR.Some classes can access jars that others cant!

Hi,
I'm experiencing a very frustrating problem that's proving to be a bit of a show stopper for me. I would really appreciate some help...
I have an EAR deployed successfully on Sun Appserver 8 which passes the tests from the sun EAR verifier tool. The ear contains a jar file that I built which has a stateless session bean, home, remote interfaces and rmi stubs, deployment descriptors, as well as some utility classes. The EAR also contains some third-party jars such as Hibernate, Log4-j, apache-commons etc etc. The jar I built has in it's manifest file, the classpath information to reference the other jars in the ear.
The problem I am having is that one of the classes in a third-party jar (hibernate3.jar) cannot see a class in another of the third party jars (log4j-1.2.8.jar) and as a result is throwing a NoClassDefFoundError for org/apache/log4j/Layout while trying to initialise - the two jars are at the root of the EAR.
Furthermore, my utility classes can access and use Log4j classes without any problem and logging command from those classes is output successfully to the server console. However, my session bean, which is packaged in the same jar as the utility classes, fails to log anything even though it uses exactly the same logger and log configuration as the utility classses.
I have tried adding classpath information to the manifest of the EAR so that the third-party jars can pick it up but this makes no difference. Also, according to the EAR verifier tool, you are not allowed to put any classpath information in the EAR manifest.
I have also tried deploying this in weblogic but am experiencing the same problem.
If anyone can offer any advice or solutions I would greatly appreciate it.
:)

whatÂ´s type error have you?
perhaps external libraries (located in classpath) invoke opsCommon.jar and config-3.0.jar classes. then, classnotfound is normal.
and... why separate external libraries (opsCommon.jar and config-3.0.jar inside ear, and other in classpath)?

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Weird classpath issue in EAR.Some classes can access jars that others cant!

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