WebStart Unable to load resource/ZipException

Question

Hello,
I am trying to get webStart to work and cannot seem to get around the following issue:
Upon clicking my go.jnlp file in Firefox, the "Java Loading" screen appears and then the webstart reports a download error.
The errors are:
Exception
com.sun.deploy.net.FailedDownloadException: Unable to load resource: http://www.otomotion.org/test/frame.jar
     at com.sun.deploy.net.DownloadEngine.actionDownload(Unknown Source)
     at com.sun.deploy.net.DownloadEngine.getCacheEntry(Unknown Source)
     at com.sun.deploy.net.DownloadEngine.getResourceCacheEntry(Unknown Source)
     at com.sun.deploy.net.DownloadEngine.getResourceCacheEntry(Unknown Source)
     at com.sun.deploy.net.DownloadEngine.getResource(Unknown Source)
     at com.sun.javaws.LaunchDownload.downloadJarFiles(Unknown Source)
     at com.sun.javaws.LaunchDownload.downloadEagerorAll(Unknown Source)
     at com.sun.javaws.Launcher.downloadResources(Unknown Source)
     at com.sun.javaws.Launcher.prepareLaunchFile(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)
Wrapped Exception
java.util.zip.ZipException: ZIP file must have at least one entry
     at java.util.zip.ZipOutputStream.finish(Unknown Source)
     at java.util.zip.DeflaterOutputStream.close(Unknown Source)
     at java.util.zip.ZipOutputStream.close(Unknown Source)
     at com.sun.deploy.net.HttpDownloadHelper.download(Unknown Source)
     at com.sun.deploy.cache.Cache.downloadResourceToCache(Unknown Source)
     at com.sun.deploy.net.DownloadEngine.actionDownload(Unknown Source)
     at com.sun.deploy.net.DownloadEngine.getCacheEntry(Unknown Source)
     at com.sun.deploy.net.DownloadEngine.getResourceCacheEntry(Unknown Source)
     at com.sun.deploy.net.DownloadEngine.getResourceCacheEntry(Unknown Source)
     at com.sun.deploy.net.DownloadEngine.getResource(Unknown Source)
     at com.sun.javaws.LaunchDownload.downloadJarFiles(Unknown Source)
     at com.sun.javaws.LaunchDownload.downloadEagerorAll(Unknown Source)
     at com.sun.javaws.Launcher.downloadResources(Unknown Source)
     at com.sun.javaws.Launcher.prepareLaunchFile(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)
I've tried quite a few different things (recompiling/jaring on other platform), I've tried different browsers on differents OS'. My jar file is signed.
Here is my jnlp file:
<?xml version="1.0" encoding="utf-8"?>
<jnlp spec="1.5+" codebase="http://www.otomotion.org/test ">
        <information>
                <title>Broken</title>
                <vendor>otomotion</vendor>
                <homepage href="www.otomotion.org"/>
                <description>Webstart Swing Test</description>
        </information>
        <offline-allowed/>
        <resources>
                <j2se version="1.5+" java-vm-args="-esa -Xnoclassgc"/>
                <jar href="frame.jar" />
        </resources>
        <application-desc>
                <argument>otomotion.org</argument>
        </application-desc>
</jnlp>My code (simple enough)
import javax.swing.*;
import java.awt.*;
public class rFrame extends JPanel {
    public rFrame() {
        super(new BorderLayout());
        JLabel hw = new JLabel("Hello World!");
        this.setPreferredSize(new Dimension(400,400));
        this.add(hw,BorderLayout.CENTER);
    private void createAndShowGui() {
        //Create and set up the window.
        JFrame frame = new JFrame("Test Frame");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //Create and set up the content pane.
        frame.setContentPane(this);
        //Display the window.
        frame.pack();
        frame.setVisible(true);
    public static void main(String[] args) {
        new rFrame().createAndShowGui();
}Thank you for your help.
Files are available at www.otomotion.org/test

Answer 1

.. I can
download the jar and run it locally.I tried running it locally, and it worked for me as well,
so I took a closer look at the Wrapped Exception
in the console and noted it mentioned ..
java.util.zip.ZipException: ZIP file must have at least one entryOK.. so I checked it using ..
jar -t frame.jar..the console just sat there doing nothing!
When I opened it using WinZip, I could see the
class, manifest and RSA/SF files, but WinZip will
handle any old junk, so that does not really help
us.
I suggest you generate the jar fresh, and check it
using the 'jar -t' command (if Jar cannot understand
it alright, I expect JWS won't either - perhaps when
'launching the jar' from the file system, such checks
are unnecessary).
The only two other things I have noted that were
'suspicious' were the lack of href attribute in the
jnlp element, and the fact that I am sometimes
getting slightly different URL's quoted (by the server)
for the address of the jar file.