JRuby

#=== file_test.rb ===

puts "__FILE__: #{__FILE__}"
puts "File.dirname(__FILE__): #{File.dirname(__FILE__)}"
puts "File.expand_path(File.dirname(__FILE__)): #{File.expand_path(File.dirname(__FILE__))}"

#=== bootstrap1.rb === (used to test uncompiled Ruby files in a jar)
require 'file_test'

#=== bootstrap2.rb === (used to test uncompiled Ruby files in a jar)
require 'src/file_test'

# GIVES CORRECT OUTPUT
#=== Running the file_test.rb file unmodified using MRI and JRuby ===
ruby file_test.rb 
__FILE__: file_test.rb
File.dirname(__FILE__): .
File.expand_path(File.dirname(__FILE__)): /Users/david/dev/projects/general/jruby_test

jruby file_test.rb 
__FILE__: file_test.rb
File.dirname(__FILE__): .
File.expand_path(File.dirname(__FILE__)): /Users/david/dev/projects/general/jruby_test

# GIVES CORRECT OUTPUT
# === Compile the file_test.rb file (jrubyc file_test.rb) ===
java -cp ~/dev/libs/jruby/lib/jruby.jar:. file_test
__FILE__: file_test.rb
File.dirname(__FILE__): .
File.expand_path(File.dirname(__FILE__)): /Users/david/dev/projects/general/jruby_test

# GIVES INCORRECT OUTPUT
# === Jarring the file_test.rb (jar -cvf file_test.jar file_test.rb bootstrap1.class) and placing jar file in /jar sub-directory ===
# Adding in compiled bootstrap1 class so java has something to launch
java -cp ~/dev/libs/jruby/lib/jruby-complete.jar:file_test.jar bootstrap1 #<-- no output, internally an exception?

# GIVES INCORRECT OUTPUT
# === Jarring the file_test.class (jar -cvf file_test.jar file_test.class) (also placing in /jar sub-directory) ===
# Moved file_test.jar into /jar subdirectory to prevent accidentally pulling in .class file
java -cp ~/dev/libs/jruby/lib/jruby-complete.jar:file_test.jar file_test
__FILE__: file_test.rb
File.dirname(__FILE__): .
File.expand_path(File.dirname(__FILE__)): /Users/david/dev/projects/general/jruby_test/jar #<-- should have /file_test.jar! on the end

GIVES CORRECT OUTPUT
# === Uncompiled Ruby file in /src directory in jar file ===
# Use bootstrap2 file to require file in 'src/test_file'
java -cp ~/dev/libs/jruby/lib/jruby-complete.jar:file_test.jar bootstrap2
__FILE__: file:/Users/david/dev/projects/general/jruby_test/jar/file_test.jar!/src/file_test.rb
File.dirname(__FILE__): file:/Users/david/dev/projects/general/jruby_test/jar/file_test.jar!/src
File.expand_path(File.dirname(__FILE__)): file:/Users/david/dev/projects/general/jruby_test/jar/file_test.jar!/src #<-- We get the jar file and the sub-dir, yay!

GIVES INCORRECT OUTPUT
# === Compiled Ruby file in /src directory in jar file ===
# As above but with compiled Ruby file, same bootstrap2 file
java -cp ~/dev/libs/jruby/lib/jruby-complete.jar:file_test.jar bootstrap2
__FILE__: file_test.rb
File.dirname(__FILE__): .
File.expand_path(File.dirname(__FILE__)): /Users/david/dev/projects/general/jruby_test/jar #<-- missing /file_test.jar!/src