--- old/jaxws/src/java.xml.ws/share/classes/com/sun/xml/internal/ws/model/RuntimeModeler.java	2017-06-01 18:21:11.785569633 +0100
+++ new/jaxws/src/java.xml.ws/share/classes/com/sun/xml/internal/ws/model/RuntimeModeler.java	2017-06-01 18:21:11.717569634 +0100
@@ -1180,7 +1180,7 @@
                     if(p == null)
                         resRpcParams.put(resRpcParams.size()+10000, param);
                     else
-                        resRpcParams.put(param.getIndex(), param);
+                        resRpcParams.put(p.getIndex(), param);
                 }
             }else{
                 javaMethod.addParameter(param);