How to deploy Java Web Start Applications on JBoss

**CodGuru** · 28-07-2010

Java Web Start is knowledge for deploying and updating desktop Java function effortlessly from a web server. In this tutorial I will demonstrate the necessary steps to install a Java Web Start application on JBoss.

Step1: Create an empty Web Project

JWS applications need to be deployed as web applications. Create an empty application named "sampleWS".

Step2: Create aa JNLP file which describes the Java Web Start application:

Code:

<?xml version="1.0" encoding="utf-8"?>
<jnlp spec="1.0+"
      codebase="http://localhost:8080/sampleWS/" 
      href="/sample.jnlp">
   <information>
      <title>Sample JWS application</title>
      <vendor>JBoss tutorials</vendor>
      <description>JWS on JBoss Demo</description>
      <homepage href="http://java.sun.com/docs/books/tutorial/deployment/webstart/running.html"/>
      <description kind="short">Example JWS application</description>
      <offline-allowed/>
   </information>
   <resources>     
   	<jar href="/myclasses.jar"/>   
	<j2se version="1.3+"
	      href="http://java.sun.com/products/autodl/j2se"/>
   </resources>
   <application-desc main-class="com.sample.MainClass"/>
</jnlp>

**CodGuru** · 28-07-2010

Step 3: Copy the application classes into the root of the Web application

As stated in the configuration file, the application classes will be searched in the root of the web application. So pack the application classes in a jar and place it on the root of the Web app.

Step 4: Copy Java Web Start libraries in the "lib" folder of the Web application

Java Web Start needs some utility libraries which are part of the J2SE. (You can find them in the folder JAVA_HOME\sample\jnlp\servlet). They are namely three files which must be placed in the "lib" folder of your web application:

jardiff.jar
jnlp-servlet.jar
jnlp.jar

Step 5: Add a web.xml file to your Web Application

You need a valid web.xml in your application which contains the mime-mappings required by Java Web Start application. The file needs to be placed in the WEB-INF folder of your web application.

Code:

<?xml version="1.0" encoding="ISO-8859-1"?>

<!DOCTYPE web-app
    PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
    "http://java.sun.com/dtd/web-app_2_3.dtd">
  
<web-app>
<mime-mapping>
    <extension>jnlp</extension>
    <mime-type>application/x-java-jnlp-file</mime-type>
</mime-mapping>
<mime-mapping>
    <extension>jar</extension>
    <mime-type>application/x-java-archive</mime-type>
</mime-mapping>
<mime-mapping>
    <extension>jardiff</extension>
    <mime-type>application/x-java-archive-diff</mime-type>
</mime-mapping>

</web-app>

**CodGuru** · 28-07-2010

Step 6: Add an index.html file

This file will be in charge to launch the Java Web Start application, by using the mime mappings configured:

HTML Code:

<html>
<head><title>Demo Test of Java Web Start</title></head>
 <body>
<center><a href="/sample.jnlp">Launch JWS</a></center>
 </ Body>

That's all. The tree resumes Following the structure of the Web application:

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