The NPE is thrown because operPartAccessor is null. // get part accessor from operation wrapper | SOAPElement operPartAccessor = XmlUtil.getElement(operationElem, partName); anonymous wrote : Gets the first child element of the given SOAP element with the specified local name and a null or empty namespace URI. | @return the corresponding child element, or null if there is no match In our case, operationElem has a child element that matches the part name. However, the namespace URI is not empty; it is equal to the namespace specified in the soap:body element in the WSDL binding output: <binding name="SchufaServiceSoapBinding" type="tns:SchufaWS"> | <soap:binding style="rpc" transport="http://schemas.xmlsoap.org/soap/http"/> | <operation name="validCustomer"> | <soap:operation soapAction="urn:samples:schufa:validCustomer"/> | <input> | <soap:body use="literal" namespace="urn:samples:schufa"/> | </input> | <output> | <soap:body use="literal" namespace="urn:samples:schufa"/> | </output> | </operation> | </binding> Try retrieving the part accessor from the operation element with the following code: // get part accessor from operation wrapper | SOAPElement operPartAccessor = XmlUtil.getElement( | operationElem, | soapBody.getNamespaceURI(), | partName); View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3999767#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...