you can either check the wsdl you started with, if wsdl first, or check the wsdl via your browser at http://localhost:8080/urltoyourservice?wsdl
what you're looking for is the namespace used for either SOAP or WSDL or SOAP Envelope
if it starts with
http://schemas.xmlsoap.org/ = SOAP 1.1
http://www.w3.org/ = SOAP 1.2/20