Create the following Java class in your project:

  1     // The Java class will be hosted at the URI path "/helloworld"
  2     @Path("/helloworld")
  3     public class HelloWorldResource {
  4 
  5         // The Java method will process HTTP GET requests
  6         @GET
  7         // The Java method will produce content identified by the MIME Media
  8         // type "text/plain"
  9         @Produces("text/plain")
 10         public String getClichedMessage() {
 11             // Return some cliched textual content
 12             return "Hello World";
 13         }
 14     }

The HelloWorldResource class is a very simple Web resource. The URI path of the resource is "/helloworld" (line 2), it supports the HTTP GET method (line 6) and produces cliched textual content (line 12) of the MIME media type "text/plain" (line 9).

Notice the use of Java annotations to declare the URI path, the HTTP method and the media type. This is a key feature of JSR 311.

The root resource will be deployed using the Grizzly Web container.

Create the following Java class in your project:

  1 import com.sun.jersey.api.container.grizzly2.GrizzlyServerFactory;
  2 import com.sun.jersey.api.core.DefaultResourceConfig;
  3 import com.sun.jersey.api.core.PackagesResourceConfig;
  4 import com.sun.jersey.api.core.ResourceConfig;
  5 import org.glassfish.grizzly.http.server.HttpServer;
  6 
  7 import javax.ws.rs.core.UriBuilder;
  8 import java.io.IOException;
  9 import java.net.URI;
 10 import java.util.HashMap;
 11 import java.util.Map;
 12 import java.util.Map.Entry;
 13 
 14 public class Main {
 15 
 16     private static URI getBaseURI() {
 17         return UriBuilder.fromUri("http://localhost/").port(9998).build();
 18     }
 19 
 20     public static final URI BASE_URI = getBaseURI();
 21 
 22     protected static HttpServer startServer() throws IOException {
 23         System.out.println("Starting grizzly...");
 24         ResourceConfig rc = new PackagesResourceConfig("com.sun.jersey.samples.helloworld.resources");
 25         return GrizzlyServerFactory.createHttpServer(BASE_URI, rc);
 26     }
 27 
 28     public static void main(String[] args) throws IOException {
 29         HttpServer httpServer = startServer();
 30         System.out.println(String.format("Jersey app started with WADL available at "
 31                 + "%sapplication.wadl\nTry out %shelloworld\nHit enter to stop it...",
 32                 BASE_URI, BASE_URI));
 33         System.in.read();
 34         httpServer.stop();
 35     }
 36 }

The Main class deploys the HelloWorldResource using the Grizzly Web container.

Line 24 creates an initialization parameter that informs the Jersey runtime where to search for root resource classes to be deployed. In this case it assumes the root resource class in the package com.sun.jersey.samples.helloworld.resources (or in a sub-package of).

Line 25 deploys the root resource to the base URI "http://localhost:9998/" and returns a Grizzly HttpServer. The complete URI of the Hello World root resource is "http://localhost:9998/helloworld".

Notice that no deployment descriptors were needed and the root resource was setup in a few statements of Java code.

Goto the URI http://localhost:9998/helloworld in your favourite browser.

Or, from the command line use curl:

> curl http://localhost:9998/helloworld

The example code presented above is shipped as the HelloWorld sample in the Java.Net maven repository.

For developers wishing to get started by deploying a Web application an equivalent sample, as a Web application, is shipped as the HelloWorld-WebApp sample.