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Seen on a PC running Fedora16

javaws -verbose jviewer.jnlp

Runs the applet ok when started from the root account. Fails with FailedDownloadException when started from a normal user's account. tcpdump shows that no TCP packet is sent out in the second case. My network has no proxy requirement. The command's output looks the same, from root or not. Here it is:

% javaws -verbose jviewer.jnlp
Java(TM) Web Start Launching: /usr/java/jre1.7.0_01/bin/java /usr/java/jre1.7.0_01/bin/java
    -classpath  /usr/java/jre1.7.0_01/lib/deploy.jar
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What information is contained in the FailedDownloadException? – Oliver Salzburg Feb 15 '12 at 12:46
Thanks, but don't worry: I just found that javaws was trying to use a proxy whereas it was not supposed to do so. – G.Bayle Feb 16 '12 at 10:21
up vote 0 down vote accepted

Javaws does not understand Firefox "no proxy" exceptions written in the form ip/mask (jre1.7.0_01, Firefox 10.0) It worked for root because Firefox used no proxy at all. My user account uses a proxy, so I had javaws work there by adding the full IP address into Firefox's "no proxy" exceptions setting.

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