My specs:
Studio Creator 2 running on Windows XP Home edition, 2.4/512MB Dell workstation.
Java SE

Hello, I am attempting to compile a single Java file into an executible JAR file. I have no problem doing this. However, when I attempt to run the JAR file, I receive the following error:

Error window header: "Java Virtual Machine Launcher"

Contents:
"Failed to load Main-Class manifest attribute from C:\....Swinger.jar"

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It is a simple Swing example. It runs fine from the IDE.

Furthermore, I know that I just need to define a Main-Class header in MANIFEST.MF. However, it is a read-only file, how would I modify this file?

Thank You all in advance ,
- Demirelli

A jar file is just a .zip file, all you need to do is extract it with winzip and change the contents of the file