Hi, jar --create (and --update) perform type API validation checks when used in combination with --release option. This detects invalid "version overlays" at package time, where the API doesn't match a previous one.
Having a jar --verify mode that performs the same checks consuming an already existing jar file would be useful as most "3rd-party packaging tools" don't perform those checks. A possible work-around could be to explode an existing jar and re-create it using jar --create... Cheers, Christian
