Serialization error when calling web service method

Hi,
In JDeveloper 10.1.3.1, I'm working on an EJB that will be deployed as a web service. There is a method in the EJB that is defined to return a generic Object, but in the implementation, it really returns one of several possible specialized bean objects. I can deploy the EJB successfully to IAS 10.1.3.1.
I created a web service proxy from the wsdl that was generated from deploying the EJB. Using the proxy, I try to call the EJB method and cast the method's return value to the bean object I know should be returned. However, I get an error like this:
java.rmi.ServerException:
start fault message:
Internal Server Error (serialization error: no serializer is registered for (class com.test.TestBean, null))
:end fault message
Does anyone know how this serialization error can be resolved? If I change the web service method signature to return the bean object that is actually being returned (instead of Object), then it works fine. But I want to be able to define the method to return a generic Object because I plan to make the method flexible enough to return several different types of bean objects. Whenever the client calls the method, it will know what is the actual object being returned and I had planned to cast the return value to its actual class.
Thanks for any ideas.

Well, I think so... I've followed all the steps, and my merged WSDL file seems like the one in page 12...
Any suggestion, please?
Thank you,

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