.jar file will not open on my Mac

2018-06-19 12:38:23

This question already has an answer here:

What does “Could not find or load main class” mean? 39 answers

Inside the jar, there should be a file:

META-INFMANIFEST.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:

Working with Manifest Files: The Basics

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