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That output is showing both the line number table and the local variable table. So it appears the code was compiled -g:lines,vars

javap -l

You add the -g flag to get the debugging stuff. The rest of the command is exactly as it would be without the flag.

Depending on how familiar you are with compiling from the command line you may...

Personally I would not attempt to decompile code of any size - not unless it was really, really important. And that's why I said if you don't have the source to person to ask about that is the...

A jar file is a sort of archive file. (In fact its a zip file, and will open and be readable by any software that reads zip files.) So adding debug information to a jar file really involves adding...