If you are working with IBM Rational Robot and TestManager, and working with Java Serialized Stream, you may consider this 3rd party extension, JSS Extension from Zyntax. Usually serialized streams are not viewable by the user and this creates the challenge of customizing the serialized streams.  The JSS Extension transforms raw socket data in previously recorded test scripts into lines that separate and identify the data elements of the Java Objects being transferred. The newly formed scripts can then be used to perform load, stress, and performance testing and benchmarking against the application.

Of course, its not free.  To request an evaluation or see JSS pricing see the JSS Request page.  For more information of this extension, you can refer to the provider's website at Zyntax Consulting.

About Zyntax Consulting, refer to Zyntax Consultin, About Us.