Java executable JAR: What class does it run?

I wanted to unpack a jar file and run it so I could tweak some properties.
I found I had to use jar to unpack it (zip had name collisions).
After unpacking look here to find out what class to run:

META-INF/MANIFEST.MF

Look at the value of:
Main-Class:

It is the class to run.

Just use java to run it:

java -cp PATH_TO_UNPACKED_FILES FULLY_QUALIFIED_PATH_OF_CLASS_TO_RUN