title: How to : Async Callbacks using SOAP/REST Web Services with Java
body: <p>We have a Java API that needs to be supplemented/fronted with a SOAP/REST Web service Layer. </p>
  
  <p>What does it take to implement Async Calls across process/server boundaries using <br>
  a) SOAP Webservices<br>
  b) RESTful webservices</p>
  
  <p>Some of the methods might need multiple calls to respond to the request.</p>
  
  <p>We will be using Java/J2ee to implement the SOAP/restful service using a library like CXF or Axis or   &nbsp;&nbsp;&nbsp;Jax-RS/WS.</p>
  
  <p>Any examples ? Gotchas ?</p>
  
  <p>Thank you,</p>