Frustrating dependencies problem

Hi everyone, I've got a problem with a large and undocumented portlet
project I have taken over from another developer who has left suddenly.
Don't worry - not looking for help with anything portal related - its more your traditonal java dependencies that I need some help with!
The structure of the project is somewhat unorthodox with one of the portlet classes being in a JAR file in the WEB-INF/LIB directory. It makes a call to a class called SearchUtils that is present in the project (but outside of this JAR file) in a regular package directory.
I can export the project as a WAR and deploy successfully to a development Websphere 5.0 server and it runs fine - but when I try to run it locally on my IDE portal test environment, I get a NoClassDefFoundError for the SearchUtils class despite it being present in the project and in the exported WAR.
I get the feeling that the JAR file containing the portlet is being loaded first and it seems to be unable to resolve the SearchUtils dependency at the time of loading.
I don't understand why the project works on our servers but not locally. I am using WSAD 5.1.2 and Portal Toolkit V5.0.2.2 (Windows).
Could anyone shed any light on how these kind of issues can be resolved?
Thanks
Marc

have i posted this in the wrong forum or is it so simple a question i should just know?
(voice echoes into the distance)

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