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I'm using a Macbook Pro running 10.7.5 Lion and I'm trying to open a Java .jar file with Jar Launcher v. 14.8.0. It returns the following error message:

The Java Jar file "1.6.2Mod.jar" could not be launched.
Check the Console for possible error messages.

On checking the console, I find this error message:

7/31/13 2:07:11.415 PM [0x0-0xa89a89].com.apple.JarLauncher: Error: Could not find or load main class net.minecraft.client.Main

Any ideas on why this is not working? I am running Oracle's Java, Version 7 Update 25.

Thanks!

Adi Inbar
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Nick Capra
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1 Answers1

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Inside the jar, there should be a file:

META-INF\MANIFEST.MF

Inside this text file, you should have at least:

Main-Class: net.minecraft.client.Main

and make sure you have this inside the jar:

net-.
    |
    minecraft-.
              |
              client-.
                     |
                     Main.class

Any extra jars should be listed with the manifast element Class-Path.

For more no this:

Eng.Fouad
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  • To look inside the jar file, unzip it. Any jar file is really just a zip file. To unzip, use either Apple's Archive Utility bundled with your Mac or use the App Store to get the free-of-cost app "The Unarchiver". If you have difficulty getting either app to recognize your jar file, then make a duplicate of the jar file and change the ".jar" to ".zip". Alternatively, you can also use the "jar" command-line tool bundled with Java to explode a jar. – Basil Bourque Jul 31 '13 at 18:49