Search:

This line tells the java program where to start:
Main-Class: javaapplication2.JavaApplication2

it's going to look for that class file in the jar file.

If that class file is NOT in the jar...

Look in the jar file with a zip utility:
1)Read the manifest file. What is in it?

2)Is there a class file named: JavaApplication2 in the javaapplication2 folder?

On windows: To copy the contents of the command prompt window:
Click on Icon in upper left corner
Select Edit
Select 'Select All' - The selection will show
Click in upper left again
Select Edit...

How are you trying to execute the program?