executable jar - Create deployable JRuby JAR file?

Question

I need to compile my JRuby application into a standalone JAR file. How can I do this?

Answer 1

Warbler 1.3.0 or newer can also be used to make an executable JAR file.

Quick instructions. Make sure you're using JRuby`s gem, etc. here:

$ gem install warbler
$ mkdir bin
$ cat <<EOF > bin/myapp
#!/usr/bin/env jruby

puts "Hello World"

EOF
$ chmod a+x bin/myapp
$ warble jar

You should now have a myapp.jar file in the current directory. According to the README you just add any libraries you need in the lib directory and use either (or both) a .gemspec or Gemfile to control any other gems that need to be put into the .jar file.