HOW TO: Build a SOAP Server and a SOAP Client on Google App Engine Mitch Rudominer February 2011 SDK: 1.4.2 Summary Building a SOAP Server on Google App Engine Building a SOAP Client on Google App Engine Using JAX-WS Summary Starting in release 1.4.2 of Google App Engine, it is possible to use java.xml.soap and JAX-B to build a SOAP server, and to use JAX-WS to build a SOAP client on App Engine.