Running a Jar file of java pro error getting error as "Failed to Load main class mainfest attribute" what i do

Answer 1

I think you want to use this command
jar x MANIFEST.MF f jarfile
to find out the contents of your manifest file

Answer 2

The take place is the document in an executable jar document that tells java which type to run on startup. perchance your jar document might no longer be an executable jar document? you may look in the jar with winzip. ultimately, in case you made the jar your self, verify the take place for suitable fomatting, it has a strict observe wrapping it fairly is enforced.