/usr/lib/ruby/vendor_ruby/aruba/jruby.rb is in ruby-aruba 0.14.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | require 'aruba/platform'
Aruba.platform.deprecated('The use of "aruba/jruby" is deprecated. Use "aruba/config/jruby" instead')
require 'aruba/config/jruby'
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