Current time:

To run the JNLP (Java WebStart) sample please click here : JImageConnect WebStart Demo

• Web Server Setup

  While Java Web Start and JNLP rely on existing technologies like HTTP and a Web server, there is one configuration issue that must be addressed for JNLP to work properly. It isn't always sufficient to just create a .jnlp file and put it on your Web server with the rest of the application; the Web server must be configured to return the proper MIME type for the JNLP content -- and that MIME type must be application/x-java-jnlp-file.

  If you are using the latest version of Tomcat -- 4.0.x -- this is already configured for you. If you look in the web.xml file in the conf directory under the installation location, you'll find the following piece of information:

    <mime-mapping>
              <extension>jnlp</extension>
              <mime-type>application/x-java-jnlp-file</mime-type>
            </mime-mapping>
  
          

  Prior versions required you to manually add this information. (Other Web servers support adding MIME types in different fashions.)

  To try out your new JNLP-based application, copy the time.jnlp file and JNLPTime.jar to a directory under the Web server where files are loaded from (for Tomcat, under webapps/ROOT). You'll also need to change the codebase in the time.jnlp file to reference the Web server (most likely http://localhost:8080) instead of the previous file URL. Then, make sure Tomcat is started, and load the application.

  To demonstrate the updating capabilities of JNLP, change the JAR file on the Web server to do something else. The next time you start up the application, the new version will be downloaded.

• IIS Server Setup

  For Windows IIS servers please review this article and remeber to use <application/x-java-jnlp-file> as your mime type

• For More Information

  • Please direct technical questions to the Java Web Start Discussion Forums
  • Articles
  • This guide contains useful Java information on various commands including keytool which is one way to create a keystore for local testing (mobilefish)
  • Java Web Start to the Rescue (JavaWorld)