jpackage messages and failures

With the commands:

jpackage -Djlink.debug=true create-image \
    --input out/artifacts \
    --output out \
    --limit-modules java.base \
    --strip-native-commands \
    --main-jar Jpackager-Hello-jar/Jpackager-Hello.jar \
    --class Main
 
And a pre-existing output directory the output is:

invalid option [-Djlink.debug=true]
Exception: java.io.IOException: Root Directory /ws/MyProjects/Jpackager-Hello/out/Main already exists and --force is not specified"
Error: Bundler "Linux Application Image" (linux.app) failed to produce a bundle.

Comments:

 - "invalid option" should be capitalized and have a colon separating it from the bad argument.

 - Processing should have stopped with the invalid argument and not continue.

 - The IOException class name should not be printed, the message should be sufficient.

 - The "ROOT" directory should have a clear correspondence to the command line arguments as being the --input, --output, or --build-root. It is a good thing that the full path name is printed.

 - The final "Error" is redundant with the other errors.

 - --force could be better named and be explicitly about the output directory. perhaps --clean-output.