Print the class and the classloader for the object you're trying
to cast. You'll see that they don't match.
Try
System.out.println(theInstance.getClass());
System.out.println(theInstance.getClass().getClassLoader());
Compare this to
System.out.println(new Solver().getClass());
System.out.println(new Solver().getClass().getClassLoader());
and you'll see that they don't match.
Your problem might be a fundamental misunderstanding of how classloaders
work. I recommend you read Shiang Leng's and Bracha's paper on
loaders, see http://java.sun.com/people/gbracha/classloaders.ps
- Godmar
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