java web start not working

**gib65** · July 12th, 2011, 03:49 PM

I'm sorry if this is in the wrong forum but I couldn't find a place for questions on java web start. Anyway...

I have a java application uploaded as a JWS program: Maze Mania

Under the MazeMania folder, I have:

MazeMania.html
MazeMania.jar
MazeMania.jnlp

I also have a "classes" folder in here with all my un-jarred class files in the appropriate packages (folders), but I don't think they're being used.

My html file looks like this:

<html>
 
<head>
<title>Maze Mania</title>
</head>
 
<body>
<script src="http://www.java.com/js/deployJava.js"></script>
    <script>
        // using JavaScript to get location of JNLP file relative to HTML page
        var dir = location.href.substring(0, location.href.lastIndexOf('/')+1);
        var url = dir + "MazeMania.jnlp";
        deployJava.createWebStartLaunchButton(url, '1.6.0');
    </script>
</body>
 
</html>

My jnlp file looks like this:

<?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+" 
    codebase="http://www.shahspace.com/JWS/MazeMania" 
    href="MazeMania.jnlp">
    <information>
        <title>Maze Mania</title>
        <vendor>Gibran shah</vendor>
    </information>
    <resources>
        <!-- Application Resources -->
        <j2se version="1.6+"
              href="http://java.sun.com/products/autodl/j2se"/>
        <jar href="MazeMania.jar" main="true" />
 
    </resources>
    <application-desc
         name="Maze Mania"
         main-class="classes.Main">
     </application-desc>
     <update check="background"/>
</jnlp>

The jar file was created with the following command:

jar cvf MazeMania.jar classes

This was just above the classes folder. In the folder was the class file Main.class along with all subfolders containing class files belonging to whatever package was named after that folder. The jar file was then uploaded to my server.

The problem is that when I try to launch this from the website, it says that it cannot find the Main class. Can anyone see why?

P.S. - I tried changing main-class="classes.Main" to main-class="Main" but I get the same error.

**KevinWorkman** · July 13th, 2011, 07:42 AM

Why do you have a classes folder instead of just putting them in the Jar?

**gib65** · July 13th, 2011, 11:08 AM

Originally Posted by KevinWorkman

Why do you have a classes folder instead of just putting them in the Jar?

That's what this tutorial says to do:

2. Create a JAR file containing your application's class files and resources.
For example, the following command creates a JAR file with the class files in the build/classes/webstartComponentArch directory.

cd build/classes
jar cvf DynamicTreeDemo.jar webstartComponentArch

Instead of a "classes" folder, they have a "webstartComponentArch" folder.

I tried going into my classes folder and typing this instead:

jar cvf MazeMania.jar .

then uploaded, but I still get the same error.

**KevinWorkman** · July 13th, 2011, 11:55 AM

Sorry, but one of us is misunderstanding the tutorial (it very well could be me). It looks to me like the tutorial is saying to jar the files in that folder into the jar as well. At the very least, I think you want your main class inside the jar. I could be wrong, but that's my approach.

**gib65** · July 13th, 2011, 12:16 PM

I would think that would be done whether I jarred it above the folder or from within it. In any case, I tried both approaches and I get the same error either way.

I think I'm going to cross-post this on http://www.java-forums.org/java-appl...tml#post221954.

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