Java EE 8 Design Patterns and Best Practices

Implementing the JAX-RS resource

In the following code snippet, we have a JAX-RS resource class, called HelloWorld. This class receives a request and returns a message to the client. Before the execution of the resource logic, AuthenticationInterceptor intercepts a call to a method and processes the authentication logic:

import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.ws.rs.GET;import javax.ws.rs.Path;import javax.ws.rs.core.Context;import javax.ws.rs.core.Response;@Path("helloworld")public class HelloWorld {    @GET    @Authentication(roles = {"user"})    public Response helloWorld(@Context HttpServletRequest request,     @Context HttpServletResponse response)  {        return Response       .ok("Hello World. ...