ClassCastException inside WorkManager on every doWork() call

With every call to WorkManager.doWork() from a ResourceAdapter, a ClassCastException is being thrown as shown in the following call stack:
java.lang.ClassCastException.<init>
weblogic.kernel.FinalThreadLocal.get
weblogic.workarea.WorkContextMapImpl.getMapMaybe
weblogic.workarea.WorkContextMapImpl.getInterceptor
weblogic.workarea.WorkContextMapImpl.copyThreadContexts
weblogic.connector.work.WorkRequest.<init>
weblogic.connector.work.WorkManager.doWork
weblogic.connector.work.WorkManager.doWork
The ClassCastException is never propogated back up the stack so it's presumably handled internally and does not prevent the Work from completing. However a performance analysis shows that the process of constructing this Exception and filling in the stack trace etc is accounting for 10% of the overall load.
Any ideas on what this might be? I'm using the single parameter doWork(Work) method.

You are trying to re-invent Oracle Grid Control.
Even if it would be technically possible, the proposed approach would be
- resource consuming
- unscalable
- unstable and error prone
You should only implement it, if you want to go job hunting.
Sybrand Bakker
Senior Oracle DBA

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