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Editorial Team
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Asked: 2026-06-11T04:39:39+00:00

I am using Netbeans to create a Java desktop application. Everything is fine inside

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I am using Netbeans to create a Java desktop application. Everything is fine inside Netbeans. But when I try to run the .jar file created in the dist folder of my project’s workspace, I get the following error: can not find or load main class.

I have recently upgraded to Java 1.7.0_03. Do you think this may be the reason? The new JDK is located inside glassfish and I don’t understand why?!

By the way when I build the same application in Mac OS X with Java 1.6 installed I don’t have any problems.

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1 Answer

  1. Editorial Team

    If you are running the jar file by double clicking it, then the error is that the manifest.mf file(usually in META-INF folder) need to have the main-class defined.

    have a look at http://java.sun.com/developer/Books/javaprogramming/JAR/basics/manifest.html

    the part

    Main-Class: com.package.MYMainClass

    else if you are running from command prompt, then

    java -jar my.jar com.package.MYMainClass
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