Web Application with JAX-RS (Jersey) on Glassfish

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In this tutorial we create a minimalistic web application by using JAX-RS annotations. Our provider class contains some simple methods, responding to HTTP GET requests:

    @Path("/welcomes")
    public class Resource {

        @GET
        @Path("hello")
        public String hello() {
            return "Hi from REST!";
        }

        @GET
        @Path("short/{name}")
        public String shortWelcome(@PathParam("name") String name) {
            return "Hi, " + name;
        }
    }

To hold the Web Service configurations we need to create a class which extends javax.ws.rs.core.Application:

package com.mycompany.restdemo;

import javax.ws.rs.core.Application;

public class ApplicationConfig extends Application {
}

To map the incoming requests under this application, annotate the class with @javax.ws.rs.ApplicationPath. Finally by overriding the 

public Set<Class<?>> getClasses()

method of the javax.ws.rs.core.Application class return the provider class(es). This will make the methods of the provider class visible under rest/welcomes/hello and rest/welcomes/short/name URLs.

package com.mycompany.restdemo;

import java.util.Set;
import javax.ws.rs.ApplicationPath;
import javax.ws.rs.core.Application;

@ApplicationPath("/rest")
public class ApplicationConfig extends Application {
    @Override
    public Set<Class<?>> getClasses() {
        return getRestResourceClasses();
    }
    
    private Set<Class<?>> getRestResourceClasses() {
        Set<Class<?>> resources = new java.util.HashSet<Class<?>>();
        resources.add(com.mycompany.restdemo.Resource.class);
        return resources;
    }
}

Your Web Service is done!

Here is the archive containing this demo project tested in GlassFish 3.1.2. It’s a maven project and you can run it right after extracting (you will need Maven) by executing:

mvn install

in the same folder where the pom.xml file is. This will download the required libraries and deploy the web application under http://localhost:8080/restDemo

restDemo.tar.gz (1.59 KB)

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