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NullpointerException when started over Java WebStart

0 votes
I want to start yed over the webstart http://www.yworks.com/products/yed/demo/yed.jnlp. When I launch the jnlp file the application seems to load, but then I get a NullpointerException and the webstart stops.

java.lang.NullPointerException
    at java.util.zip.ZipFile.<init>(Unknown Source)
    at java.util.zip.ZipFile.<init>(Unknown Source)
    at java.util.jar.JarFile.<init>(Unknown Source)
    at java.util.jar.JarFile.<init>(Unknown Source)
    at com.sun.javaws.LaunchDownload.getMainClassName(Unknown Source)
    at com.sun.javaws.Launcher.doLaunchApp(Unknown Source)
    at com.sun.javaws.Launcher.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

Whats wrong here?
asked Apr 24, 2014 in Help by anonymous

1 Answer

0 votes
It is difficult to tell what went wrong. In any case, this is a Web Start problem, not a yEd problem. Maybe Web Start was not able to download the yEd application. (E.g. because your firewall is blocking the download.) Or maybe an over-zealous anti-virus software deleted the yEd application right after download and before Web Start could run yEd.

The best advice I can offer is to update your Web Start installation to the latest version (8u5 as of this writing) and try again. If that does not help, install yEd locally.
answered Apr 24, 2014 by thomas.behr [yWorks] (124,270 points)
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