ClassCastException in executable JAR not inside IDE

I have a problem running my application outside Eclipse. It gives ClassCastException at the place where the application inside IDE does not. In particular, I output to the terminal the name of the instance I'm trying to cast and inside IDE it gives the correct type such as "NestedEngineImpl" whereas outside IDE it gives "EngineImpl" with the exception that EngineImpl cannot be cast to NestedEngineImpl. NestedEngineImple extends EngineImpl.The executable jar has been created using Eclipse' Export Runnable JAR file. The jar opens and runs until the point of exception.
Any advice will be greatly appreciated.

The application works fine inside Eclipse. These classes are built from the source code in the project. When I output the instance I'm trying to cast with .getClass().getName() it returns NestedEngineImpl, meaning that it can be cast to NestedEngineImpl. When the applications runs in standalone, the output is EngineImpl and the cast fails. Why is the output EngineImpl?
Edited by: 807433 on Nov 4, 2010 3:30 PM

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