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JADE framework and JSTL breaks!

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I'm developing in WSAD using the EAD4J JADE framework. We are trying to install the JSP Standard Tag Library (JSTL). I downloaded Standard 1.03 from Jakarta and copied all the jar files into my webApplication/WEB-INF/lib directory.
When I go into WSAD, refresh from local, rebuild and start the server, the application dies. I can still get to the entry page which is just HTML but as soon as I try to log in, my login servlet dies and gives a ClassCastException (see below)
Anyone out there ever worked with JADE and had a similar problem? Could there be naming conflicts? I've tried going through debug, but i don't have access to the source code that is throwing the exception. Are they just plain incompatible? We don't appear to have the JADE tag libs installed so I don't know why there would be a conflict. Here's my exception.
java.lang.ClassCastException: at at javax.rmi.PortableRemoteObject.narrow( at at at at at at at at
any help would be appreciated.
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