At the default verbosity, when an error is hit in jar2xml, the error message the user gets is "java.exe exited with code -1". jar2xml needs to output errors that are compatible with msbuild so they show up in the user's IDE.
Example error with Diagnostic verbosity:
MSBuild error format:
jar2xml is done, but generator needs the same (and a lot more) work.
generator is done too. Though monodevelop does not pick them up. Not sure if VS does yet.
With some workaround, it started to appear on the error/warning list on MD.