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To deploy a processing sketch via java webstart export the sketch as an application (i used my randomlines sketch and exported it as a linux application).

then i wrote a simple jnlp file and copied the files to my webserver. The only thing thats left is providing a link to the jnlp file like this.

click here to dowload and launch the application

More info on jnlp and webstart can be found here

test.jnlp

<?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+" codebase="" href="">
    <information>
        <title>Processing Test</title>
        <vendor>guru</vendor>
        <icon href="https://www.local-guru.net/jnlp/randomlines/randomlines.png"/>
        <desktop/>
        <offline-allowed/>
        <shortcut online="false">
              <desktop/>
        </shortcut>
    </information>
    <resources>
        <j2se version="1.5+" href="http://java.sun.com/products/autodl/j2se"/>
        <jar href="https://www.local-guru.net/jnlp/randomlines/lib/randomlines.jar" main="true" />
        <jar href="https://www.local-guru.net/jnlp/randomlines/lib/core.jar" main="true" />
    </resources>
    <application-desc
         name="ProcessinTestApp"
         main-class="randomlines"
         width="300"
         height="300">
     </application-desc>
     <update check="background"/>
</jnlp>