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Is possible to use JRuby command line arguments inside of a .jar? #5150

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bolandross opened this issue Apr 24, 2018 · 1 comment
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Is possible to use JRuby command line arguments inside of a .jar? #5150

bolandross opened this issue Apr 24, 2018 · 1 comment
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@bolandross
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Hey folks,
sorry for the fact that this isn't an 'issue' and more just a question.

I am packaging my app with warbler to create a Java Jar file.
As far as I know, this bundles up JRuby with all my gem dependencies and then runs my script. Is there a way to specify command line arguments for this?

For example, I'd like to use the --dev argument for improved startup times.
Can I somehow define this inside of the jar manifest file?
@enebo enebo added this to the Invalid or Duplicate milestone Apr 24, 2018
@enebo
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enebo commented Apr 24, 2018

This is what I have always considered a weird oversight in executable jar format in Java. You basically need to load java and the re-load it again (tiny Java programs startup much faster than JRuby itself so this may not be a big hit). I think there are some other programs which were made for this too (Capsule?):

http://blog.codejava.net/nam/trick-for-passing-vm-options-when-launching-jar-file/

@enebo enebo closed this as completed Apr 24, 2018
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@enebo @bolandross