I also could recreate this issue, look like REST style not working properly here. However if you call your webservice as normal soap call it works, example use SoapUI to test your webservice giving WSDL file to SoapUI tool, this is working.
If you need to access Web Service in REST style (even support SOAP style) , go for POJO deployment model,it has worked for me. (refer http://axis.apache.org/axis2/java/core/docs/pojoguide.html )