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javax.microedition.xml.rpc.Operation.newInstance returns null - JSR172

I am using the Sun Wireless Toolkit 2.5.2 to generate web services client stubs. When running the generated code, the method Operation.newInstance method always returns null. The generated code is:

Operation op = Operation.newInstance(_qname_a, _type_b, _type_c); _prepOperation(op); ...

'op' is null after the call which then causes an exception in _prepOperation().

Does the JSR172 library need to be initialized before use?

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