1. Create the main class and wrap it in a JAR file. For simplicity sake, the main class extends JFrame that contains a JButton inside a JPanel as shown below:
2. Create a JNLP (Java Network Launch Protocol) file that links to the JAR file.
This file is an xml file and the structure is quite self explanatory. The main things here are the codebase attribute in <jnlp> element and the <jar> tag inside <resources> element. The codebase describes base path for all href in the file, in this case it is the base path to find jnlp.jnlp and jnlp.jar since I put those two files in the same folder. The jnlp.jar contains a main class which is stated in main="true" and main-class="edu.mat.jnlp.Main".
3. Create a HTML file that contains a link to the JNLP file.
Opening the HTML in a browser displays the following screen
