🚀 go-pugleaf

I had a problem with the following codes, which are called
in ejb component in app server.
StateHandler is interface and SigninHandler implements it.
If I include the line with System.out.println(), it will run OK.
But if I comment out System.out.println(), a 
ClassCastException error will be throwed in the next line 
(handler = (StateHandler)o),

    Class c1 = Class.forName(handlerName);
    Object o = c1.newInstance();
    System.out.println("StateMachine: o = " + (SigninHandler)o);
    handler = (StateHandler)o;  // exception throws

I am running jbuild4.0 Enterprise version.  My OS is NT4.0
I had created an small test program to test these pieces of
codes and used the same classpath used by appserver.  It works 
regardless the println statement.  

Any help is welcomed.

thanks!

ct