Here's the code I wrote to invoke the web service: { CurrencyForm form = null; CurrencyWSService svc = null; form = populateCurrencyForm(); // Souce, target currencies svc = new CurrencyWSService(); CurrencyWS currencyWS = svc.getCurrencyWSPort(); System.out.println(form); form = currencyWS.convertCurrency(form); System.out.println(form); } The exception is thrown at the getCurrencyWSPort() call. Here's my Service Endpoint Interface (SEI): @WebService(name = "CurrencyWS", targetNamespace = "http://currencyconverter.ws/") public interface CurrencyWS { @WebMethod @WebResult(targetNamespace = "") @RequestWrapper(localName = "convertCurrency", targetNamespace = "http://currencyconverter.ws/", className = "ws.currencyconverter.ConvertCurrency") @ResponseWrapper(localName = "convertCurrencyResponse", targetNamespace = "http://currencyconverter.ws/", className = "ws.currencyconverter.ConvertCurrencyResponse") public CurrencyForm convertCurrency(@WebParam(name = "arg0", targetNamespace = "") CurrencyForm arg0); } I seem to have the necessary @WebService annotation, yet the JBoss container throws the exception (see my previous posting). Any thoughts? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4056580#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...