Error when starting a jnlp that should work fine

Question

When i try to launch a jnlp file with Web Start, I get an "Unable lo launch the application" error right after the "Java Starting..."-splash appears.
Details:
MissingFieldException[ The following required field is missing from the launch file: <jnlp>]
     at com.sun.javaws.jnl.XMLFormat.parse(Unknown Source)
     at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
     at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
     at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
     at com.sun.javaws.Launcher.updateFinalLaunchDesc(Unknown Source)
     at com.sun.javaws.Launcher.prepareToLaunch(Unknown Source)
     at com.sun.javaws.Launcher.launch(Unknown Source)
     at com.sun.javaws.Main.launchApp(Unknown Source)
     at com.sun.javaws.Main.continueInSecureThread(Unknown Source)
     at com.sun.javaws.Main$1.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
The jnlp:
<?xml version="1.0" encoding="UTF-8"?>
<jnlp codebase = "http://aoc.idi.ntnu.no" href = "aoc3.jnlp">
  <information>
    <title>Age of Computers 3</title>
    <vendor>Datamaskiner Grunnkurs</vendor>
    <homepage href = "http://www.idi.ntnu.no/~joh/"/>
    <description>Spillbasert &#65533;vingsopplegg for datamaskiner grunnkurs</description>
  </information>
  <resources>
    <j2se version = "1.5+"/>
    <jar href = "aoc3Client.jar"/>
  </resources>
  <security>
    <all-permissions/>
  </security>
  <application-desc main-class = "aoc3.client.Client">
    <argument>aoc.idi.ntnu.no</argument>
  </application-desc>
</jnlp>(As far as I can see, it's not missing the <jnlp> tag...)
The jnlp and application runs fine on other computers, so the problem must be on my computer.
I'm running 1.6.0_07, and the application requires 1.5 and Web Start. The jnlp's on http://java.sun.com/javase/technologies/desktop/javawebstart/demos.html works fine.
What can I do to get the jnlp to work on my computer?
Edited by: newbie1986 on Aug 29, 2008 4:12 AM

Answer 1

OK, so here's the thing. It turned out that the wireless connection I'm using is (probably) blocking the port that the application needs, but no "connection error" message is shown, so it's impossible to tell why the application doesn't start. I've started a VPN, and now it works, so I guess it's a problem with the ports on my wireless!
I'm still not sure why I had to delete the cache though...