How can I configure RPC parameter names?

With <java-wsdl> this information is not available through reflection, you will have to use JSR181 @WebParam like this

   @WebMethod(operationName = "SecurePing")
   public void ping(
       @WebParam(name = "Ping") PingDocument p, 
       @WebParam(name = "SecHeader", header = true) SecurityHeader secHdr)
   {
      log.info("ping: " + p + "," + secHdr);
   }

From jbossws-1.0.0.GA it is also possible to specify the names of the parameters to be used in the generated WSDL by adding an operation mapping to the service element e.g.

   <service name="PhoneBookService" style="document" endpoint="com.darranl.ws.paramorder.PhoneBookService">
     <operation name="lookup">
       <parameter type="java.lang.String" xml-name="surname" ></parameter>
       <parameter type="java.lang.String" xml-name="foreName" ></parameter>
       <parameter type="java.util.Date" xml-name="dob" ></parameter>
       <parameter type="java.lang.String" xml-name="id" ></parameter>
     </operation>
   </service>

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