Java™ API for XML-Based Web Services (JAX-WS) includes an asynchronous response servlet, which is used within the application server environment to receive responses for JAX-WS requests that are invoked asynchronously.
Java API for XML-Based Web Services (JAX-WS) includes an asynchronous response listener, which is used within the Thin Client for JAX-WS and application client environments to receive responses for requests that are invoked asynchronously.