A member of my guild posted to our forums that they are getting an exception when clicking the link. As I suspected, it appears the app has been updated recently and now even I am unable to run the app. Here's the Exception:

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JNLPException[category: Launch File Error : Exception: null : LaunchDesc:
<jnlp spec="1.0+" codebase="http://lhunath.lyndir.com/jUniUploader/" href="http://www.tyrannyofsouls.com/uniadmin/jUniUploader.jnlp">
  <information>
    <title>jUniUploader</title>
    <vendor>Lhunath</vendor>
    <homepage href="http://lhunath.lyndir.com/jUniUploader"/>
    <description>Upload World of Warcraft character data to online rosters and administer addons.</description>
    <description kind="short">UniUploader for Java.</description>
    <icon href="http://lhunath.lyndir.com/jUniUploader/wow.png" kind="default"/>
    <icon href="http://lhunath.lyndir.com/jUniUploader/splash.png" kind="splash"/>
    <offline-allowed/>
  </information>
  <security>
    <all-permissions/>
  </security>
  <update check="timeout" policy="always"/>
  <resources>
    <java max-heap-size="536870912" href="http://java.sun.com/products/autodl/j2se" version="1.5+"/>
    <jar href="http://lhunath.lyndir.com/jUniUploader/jUniUploader.jar" download="eager" main="false"/>
    <jar href="http://lhunath.lyndir.com/jUniUploader/BaseSystem.jar" download="eager" main="false"/>
    <property name="uniadmin" value="http://tyrannyofsouls.com/uniadmin/interface.php"/>
  </resources>
  <application-desc/>
</jnlp> ]
   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)


Here is my JNLP (Launch file tab):

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<?xml version="1.0" encoding="utf-8"?>

<!-- !!! IMPORTANT !!!
    You must modify the next line so that
        href="jUniUploader.jnlp"
    becomes
        href="http://www.tyrannyofsouls.com/uniadmin/jUniUploader.jnlp"
    This URL is the URL that you would type in your browser to open this JNLP file. -->
<jnlp spec="1.0+" codebase="http://lhunath.lyndir.com/jUniUploader" href="http://www.tyrannyofsouls.com/uniadmin/jUniUploader.jnlp">

    <information>
        <title>jUniUploader</title>
        <vendor>Lhunath</vendor>
        <description>Upload World of Warcraft character data to online rosters and administer addons.</description>
        <description    kind="short">UniUploader for Java.</description>
        <homepage       href="http://lhunath.lyndir.com/jUniUploader"   />
        <icon           href="wow.png"                                  />
        <icon           kind="splash"
                        href="splash.png"                               />
        <offline-allowed                                                />
    </information>

    <application-desc                                                   />

    <security>
        <all-permissions                                                />
    </security>

    <resources>
        <j2se href="http://java.sun.com/products/autodl/j2se"
              version="1.5+"
              max-heap-size="512m"                                      />
        <jar  href="jUniUploader.jar"                                   />
        <jar  href="BaseSystem.jar"                                     />
        <!--
            This part allows some OPTIONAL configuration.
            You may leave this alone if you aren't interested in what it has to offer.

            With the settings below, you can configure the default behaviour of jUniUploader when started with this JNLP file.

            REMEMBER:  Most default settings are taken from UniAdmin.
                       If you don't have UniAdmin installed yet,
                       you should probably do so now and use that to set
                       some defaults for jUniUploader.

            property name   |   property value's description
                        ====|====
                            |
            uniadmin        |   Put the URL of your UniAdmin installation here.
                            |   For Example:  http://androgynous-guild.com/roster/uniadmin/interface.php
                        ----|----
            theme           |   Put the name of a theme or the HTML Hex code of the base color of your custom theme.
                            |   Available theme names:   Fog, Dew, Candy, Aztek, Nature, Forest, Oak,
                            |                            Salt. Baby, Sunlit, Coral, Tech, Aurora, Blood.
                            |   Or a color, for example: #DD66CC, #336699, #99CC33, ...

            (Remove the !-- and -- at the beginning and end of the following lines if you want to use them.)
        -->
        <property name="uniadmin"
                     value="http://tyrannyofsouls.com/uniadmin/interface.php"     />
        <!--property name="theme"
                     value="THEME"                                                      /-->
    </resources>

</jnlp>


my guild is suffering from the same error. it sounds like an certificate problem.

This has been fixed yesterday.

I should have made a public notice to everybody using a customized JNLP file that they need to update it.

This is what has changed about the JNLP file:

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<application-desc                                                   />

Replace this with:

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<application-desc main-class="com.lyndir.lhunath.juniuploader.ui.Gui" />

The cause for this change is that signing a JAR overwrites its executable properties meaning now the JNLP file has to specify how to execute the JAR.

Don't hesitate to report any further feedback about this issue.

thank you