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Grouper SOAP uses auto-marshaling from Axis2 which does not support conditional fields (if null, it send back the field and says it is null). So there is a new source path for 2.0, WSDL, and a new endpoint, aar, build script entry, etc. The 1.6 WSDL is on the 2.0 server under the same name, the new one is:GrouperService_v2_0.wsdl. the new WSDL does have a new target namespace too:
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