Finder methods that return collections (don't work)

Hi all, this looks like an internal error, but I though Id ask incase there is a way around it.
Im having some problems with entity java beans using jdeveloper and the internal j2ee server. The bean is deployed and runs, find by primary key and all other methods work except find by last name which returns a collection.
I have experimented with the code, and stepped through with the debugger. The debugger doesn't find any errors or throw any exceptions. The method which it calims causes the error ejb find by last name does not throw an error and exits normally.
Though experiments I have done I have found that the failure only occurs if the collection returned has elements. If and empty collection is returned then the error is not given. If null is returned then the same error is given with a null pointer exception at the start instead of class cast. I have tried serveral variations on this code and none seem to work. Im hoping this is a common bug and you can point me towards a solution.
I have browsed your forum and searched your site, as well as the web for information on this bug but have not found any information.
My OS is Linux Red Hat 8.0 and the version of JDeveloper is 9.0.2.8.2. I urgenly need assistance with this, it forms the basis for a final year degree project which needs to be submitted in 4 weeks.
-- Error output --
java.lang.ClassCastException: java.lang.Integer
     at com.evermind.server.rmi.RMIConnection.EXCEPTION_ORIGINATES_FROM_THE_REMOTE_SERVER(RMIConnection.java:1530)
     at com.evermind.server.rmi.RMIConnection.invokeMethod(RMIConnection.java:1453)
     at com.evermind.server.rmi.RemoteInvocationHandler.invoke(RemoteInvocationHandler.java:53)
     at com.evermind.server.rmi.RecoverableRemoteInvocationHandler.invoke(RecoverableRemoteInvocationHandler.java:22)
     at __Proxy0.findByLastName(Unknown Source)
     at SamplepodPackage.PatientClient.main(PatientClient.java:88)
-- output ends --
Thanks for your time
Glenn Jenkins
(Glamorgan University)

I think I've figured it out. I checked my keywords and some of the keywords I used were unintentionally under another keyword, so it appears that smart collections useingn using child keywords will always include the parent keyword, even if that keyword isn't listed in the Keyword panel. When I moved the wrong children outside the existing parent, the Smart Collection worked properly. Now I have to figure out how the keywords unintentionally became children to other keywords.
CPB
CPB
Craig P. Beyers
703-626-3848 (m)

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