Apache Geronimo v2.2 Documentation: Developing a Hello World Web application

This application is a simple Hello World application which will output Hello World!! on the browser. It needs a dynamic Web project and a JSP associated with it.

To run this tutorial, as a minimum you will be required to have installed the following prerequisite software:

Sun JDK 6.0+ (J2SE 1.6)
Eclipse IDE for Java EE Developers, which is platform specific
Apache Geronimo Eclipse Plugin 2.1.x
Apache Geronimo Server 2.1.x

Geronimo version 2.1.x, Java 1.5 runtime, and Eclipse Ganymede are used is used in this tutorial but other versions can be used instead (e.g., Geronimo version 2.2, Java 1.6, Eclipse Europa)

Details on installing eclipse are provided in the Development environment section. This tutorial is organized in the following sections:

Creating a dynamic Web project using Eclipse
Adding a JSP to the project
Making hellp.jsp the welcome file
Run and deploy

Creating a dynamic Web project using Eclipse

Launch Eclipse and Switch to Java EE perspective.
Right click under the project explorer and select Dynamic Web Project as shown in the figure
Name the project as HelloWorld.
Keep default values for all the fields and select Finish.

Adding a JSP to the project

Right-click on the project HelloWorld and create a new JSP as shown in the figure.
Give the name as hello.jsp and select Next. Select Finish on the next screen

Modify the code of hello.jsp as follows:

hello.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Hello World</title>
</head>
<body>
Hello World!!
</body>
</html>

Making hellp.jsp the welcome file

Click WebContent -> WEB-INF and open web.xml.

Add hello.jsp as a welcome file under the <welcome-file-list> tag:

web.xml

<?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>HellowWorld</display-name>
   <welcome-file-list>
    <welcome-file>hello.jsp</welcome-file>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>

Run and deploy

Deploy the application on the server.
launch the application using http://localhost:8080/HelloWorld/hello.jsp
This will display HelloWorld!! on the browser window.