The Java™ Tutorials
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Deploying a Java Web Start Application
Trail: Deployment
Lesson: Deployment In-Depth
Section: Deployment Toolkit

Deploying a Java Web Start Application

You can deploy Java Web Start applications by using the createWebStartLaunchButton function of the Deployment Toolkit script. Java Web Start applications are launched using Java Network Launch Protocol (JNLP) The createWebStartLaunchButton function generates a link (HTML anchor tag - <a>) to the Java Web Start application's JNLP file.

This generated anchor tag is the Java Web Start application's Launch button button. When the end user clicks the Launch button, the Deployment Toolkit script ensures that the appropriate Java Runtime Environment (JRE) software is installed and then launches the Java Web Start application.

Note: Depending on the type of browser, you might be unable to view the HTML generated by the Deployment Toolkit script when you try to view the source for the web page. To view the generated HTML, try saving the HTML page after it has been loaded, or use a tool such as Firebug (a Mozilla Firefox add-on).

Note: If the client does not have the required minimum version of the JRE software, the Deployment Toolkit script redirects the browser to to allow users to download the latest JRE software.

Function signature: createWebStartLaunchButton: function(jnlp, minimumVersion) or createWebStartLaunchButton: function(jnlp)



Note: When deploying by using any of the previously described createWebStartLaunchButton functions, you must specify an absolute codebase in the Java Web Start application's JNLP file. This enables the Java Web Start application to be launched from the command line with the javaws <path/to/local JNLP file> command.

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Next page: Changing the Launch Button