This is a very simple, GET-only web application built with Jersey. It has two purposes:

1. Illustrate some of the basics of setting up a Jersey-based servlet and returning responses with it
2. Serve as a test that you are able to deploy a Jersey-based web app in your environment

You can download hello-jersey.war directly into your GlassFish's autodeploy directory. It also contains source code. It has been deployed on einstein. The following links exercise its capabilities

• Plain-text response, fixed 
• Plain-text response, with input taken from the end of the URL
• XML response, fixed
• HTTP not-found response, fixed
• HTTP not-found response, with input taken from the end of the URL (if you're using Internet Explorer, to see the response content, you may have to uncheck "Show friendly HTTP error messages" in the Browsing section of the Advanced tab of Tools > Internet Options... dialog)
• HTTP bad-request response, fixed

Note also the WEB-INF/web.xml in this demo. It tells the container to use a general-purpose ServletContainer class supplied by Jersey. That class knows how to scan your code for JAX-RS-annotated classes and methods, and invoke them when necessary. You should be able to use this same web.xml for all of your Jersey-based servlets, unless you want to change the display name to fit your web app. The content is below.

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>Hello world with Jersey</display-name>
  <servlet>
    <servlet-name>JerseyServlet</servlet-name>
    <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>JerseyServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>