Deployment and Integration - RESTful Java with JAX-RS 2.0 - page 210

Let's look at a simple example of an Application class:

package package com . restfully . shop . services ;

import import javax.ws.rs.core.Application javax.ws.rs.core.Application ;

public public class class ShoppingApplication ShoppingApplication extends extends Application {

public public ShoppingApplication () {}

public public Set < Class <?>> getClasses () {

HashSet < Class <?>> set = new new HashSet < Class <?>>();

set . add ( CustomerResource . class );
set . add ( OrderResource . class );
set . add ( ProduceResource . class );
return return set ;

}

public public Set < Object > getSingletons () {

JsonWriter json = new new JsonWriter ();

CreditCardResource service = new new CreditCardResource ();

HashSet < Object > set = new new HashSet ();

set . add ( json );
set . add ( service );
return

return set ;

}

}

Here, we have a ShoppingApplication class that extends the Application class. The
getClasses() method allocates a HashSet , populates it with @Path annotated classes, and
returns the set. The getSingletons() method allocates a MessageBodyWriter class named
JsonWriter and an @Path annotated class CreditCardResource . It then creates a HashSet
and adds these instances to it. This set is returned by the method.

Deployment Within a JAX-RS-Aware Container
Java EE stands for Java Enterprise Edition. It is the umbrella specification of JAX-RS and
defines a complete enterprise platform that includes services like a servlet container, EJB,
transaction manager (JTA), messaging (JMS), connection pooling (JCA), database persisten-
ce (JPA), web framework (JSF), and a multitude of other services. Application servers that
are certified under Java EE 6 are required to have built-in support for JAX-RS 1.1. Java EE 7
containers are required to have built-in support for JAX-RS 2.0.