Services

The application is a class extending the Application class, and it declares the root HTTP path that a client will use through the @ApplicationPath annotation. Here's a sample of the application:

@ApplicationPath("/services")
publicclass CalculatorApplication extends Application {
    @Override
    public Set<Class<?>> getClasses() {
       final Set<Class<?>> classes = new HashSet<>();
       ...
       classes.add(Calculator.class);
       returnclasses;
    }
    ...
}

The getClasses() method contains all the components and services used in the application.

The REST services are beans annotated with the JAX-RS annotations. These services can be declared along with the other enterprise components, such as servlets or EJB. The REST services must be contained in an application. In this sample, we see a stateless REST service:

@Path("/calculator")
@Stateless
publicclass Calculator {
   @GET
   @Path("/sum")
   @Produces(MediaType.TEXT_PLAIN)
   publicdouble...