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    <p>The things that seem to be needed in NetBeans are:</p> <ul> <li>The project has to be the Main Project (by right clicking on it in the Projects list).</li> <li>You have to set the Main Class in the project properties. (Right click, Properties, Run, Main Class.)</li> </ul> <p>Then when you right click on your project and do a "Clean and Build", a jar will get built into the <code>dist</code> subdirectory.</p> <p>If that fails to fix the problem, here's a longer story...</p> <p>When you double click a jar file to run it, the operating system acts as if you had typed this from the command line:</p> <pre><code>java -jar filename.jar </code></pre> <p>(When you say it works for you from the command line, is this what you're typing?)</p> <p>At that point, the Java executable looks for a file inside the jar named <code>META-INF/MANIFEST.MF</code>. And then in the contents of that file, it looks for the value of a property, <code>Main-Class</code>. And finally it looks for the class of that name in your jar and runs its static <code>main(String[])</code> method.</p> <p>So if your jar is failing to run, you can do the following to debug what's going on:</p> <ul> <li>Clean and rebuild your project in NetBeans.</li> <li>Double check that your class(es) are actually in the jar: <ul> <li>Start a command prompt</li> <li><code>cd</code> into the <code>dist</code> subdirectory of your project.</li> <li>Use a command like <code>jar tf filename.jar</code> to list what's in there.</li> </ul></li> <li>Double check that the <code>MANIFEST.MF</code> file is correct: <ul> <li>Again in a command prompt</li> <li><code>cd</code> into the <code>dist</code> directory.</li> <li>Use a command like <code>jar xf filename.jar META-INF/MANIFEST.MF</code> to extract the manifest.</li> <li>Look at the contents of that file (e.g. <code>type META-INF\MANIFEST.MF</code>) and make sure <code>Main-Class</code> is set to the appropriate class.</li> </ul></li> </ul> <p>If all of the above check out, then double clicking the file <em>should</em> work.</p>
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    1. COOk, this is *really* weird. First, yes I am typing something like `java -jar filename.jar` - to be precise, it's `java -jar "C:\Users\Me\Documents\NetBeansProjects\Projectname\dist\Projectname.jar"` (am I supposed to have the ""?). Second, everything you listed is correct - in fact, when I type `jar tf filename.jar`, it clearly lists the class it can't find - as `packagename/Classname.class` (it tells me it can't find `packagename.Classname.class`). Everything else is perfect. And it works from the command line, yet not from doubleclicking.
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    2. COWhat is the value of the `Main-Class` property in your `MANIFEST.MF`?
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    3. COpackagename.Classname - everything perfect.
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