Hi, I have developed the same thing for that means I have developed example that you have stated but still get the error that if i am returning the void then it will works fine with my client but when I am developing the service that return the type Int than it will throws the error. I have done some googles on that and found that any kind of mapping is required for that and I have also included one file that is ws4ee-deployment.xml is that any kind of thing we required for the mapping so when it will return the service can use the mapping for the deserialization The Error i got is stated below: localhost invokeMethod >>> org.apache.wsif.WSIFException: SOAPException: SOAP-ENV:ClientNo Deserializer found to deserialize a ':result' using encoding style 'null'.; nested exception is: [SOAPException: faultCode=SOAP-ENV:Client; msg=No Deserializer found to deserialize a ':result' using encoding style 'null'.; targetException=java.lang.IllegalArgumentException: No Deserializer found to deserialize a ':result' using encoding style 'null'.] at org.apache.wsif.providers.soap.apachesoap.WSIFOperation_ApacheSOAP.invokeRequestResponseOperation(WSIFOperation_ApacheSOAP.java:697) at org.apache.wsif.providers.soap.apachesoap.WSIFOperation_ApacheSOAP.executeRequestResponseOperation(WSIFOperation_ApacheSOAP.java:575) and My wsdl file is following: <definitions name="MathService" targetNamespace="http://math.ws.jboss.org/" xmlns="http://schemas.xmlsoap.org/wsdl/" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:tns="http://math.ws.jboss.org/" xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <soap:binding style="rpc" transport="http://schemas.xmlsoap.org/soap/http" /> <soap:operation soapAction="" /> <soap:body namespace="http://math.ws.jboss.org/" use="literal" /> <soap:body namespace="http://math.ws.jboss.org/" use="literal" /> <soap:address location="http://localhost:8080/mathservice/MathWs" /> Thank you for your all replies, Rahul View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4089235#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...