I can't execute my jar files

[Darkmatter777]

Hey guys, when I invoke the command java -jar jarfile.jar I get this msg:
failed to load Main-Class manifest attribute from (file)
Can you please tell me what this means? Thanks

[Thrillhouse]

Is this a jar you packaged yourself, or one that you downloaded that you're trying to run? If it's one you made then I would take a look at this guide and make sure it's packaged correctly. The section that deals with the manifest would probably be particularly helpful to you.

[scrarfussi]

also make sure you have java installed

[Darkmatter777]

Actually I'm trying to unpack some files I downloaded. And yes, I do have java installed. Hmmm...

[Thrillhouse]

Now I'm confused. Are you trying to unpack a jar or execute it? To execute it, use the "java -jar" command. To unpack it, use the "jar" command. It should be installed if you have java installed. Typical usage would be:

jar xf yourjar.jar

Check the man page for more details.