This article discusses how to implement an asynchronous web service in Java EE. The Java application will expose a one way operation that will process the request and send a response message to a callback Web Service interface that is indicated in the request header through WS Addressing properties (messageID, replyToAddress). The Asynchronous Web Service is subsequently deployed and invoked from SoapUI.
The article starts with nothing but a simple WSDL file that defines the two portTypes: one way call and the [one way] call back:
The main steps are:
- Generate the JAX-WS Client & Proxy for the ThoughtfulGreeterCallback portType (to invoke the callback service in order to send the response)
- Generate the JAX-WS Web Service for the ThoughtfulGreeter portType (to implement the one way web service)
- Edit the generated code for the ThoughtfulGreeter portType in order to create the response and invoke the callback interface – used on WS-Addressing details in the request
When the implementation is thus complete, we create a new project in SoapUI. In this project, we will create a test request to invoke the ThoughtfulGreeter service. We will also create a MockService in SoapUI to act as the callback interface ThoughfulGreeterCallback. In the request from SoapUI to the ThoughtfulGreeter service, we will specify WS-Addressing properties that refer to the MockService.
Finally, when we have SoapUI make the call to the ThoughtfulGreeter service, we will receive a call (back) to the MockService, containing the response.