JRuby self requiring file errors

generate_self_requiring_files.rb

base_class = <<-FILE

class BaseClass
end

require_relative 'subclasses/middle_class'

registered_sublcasses = MiddleClass.registered_subclass_names
expected_subclasses = ['Subclass1', 'Subclass2']

puts BaseClass.name + ' loaded'
puts MiddleClass.name + ' loaded'
puts Subclass1.name + ' loaded'
puts Subclass2.name + ' loaded'

if registered_sublcasses == expected_subclasses
  puts 'All good here'
else
  raise "Checked sublcasses of MiddleClass from inheritance hook. Got: " + registered_sublcasses.join(', ') + ", expected: " + expected_subclasses.join(', ')
end

FILE

middle_class = <<-FILE

class MiddleClass < BaseClass

  @registry = {}

  class << self
    def inherited(subclass)
      @registry[subclass.name] = subclass
    end

    def registered_subclass_names
      @registry.keys
    end
  end

end

# This is where things blow up - as the file is required, it requires a subclass file, then requires itself again and
#  then one more subclass file (due to file name order)

Dir[File.dirname(__FILE__) + '/*.rb'].each {|file| require file } 


FILE

a_subclass = <<-FILE

class Subclass1 < MiddleClass
end

FILE

z_subclass = <<-FILE

class Subclass2 < MiddleClass
end

FILE

`rm base_class.rb`
`rm -r subclasses`
`mkdir subclasses`

(File.new('base_class.rb', 'w') << base_class).close
(File.new('subclasses/middle_class.rb', 'w') << middle_class).close
(File.new('subclasses/a_subclass.rb', 'w') << a_subclass).close
(File.new('subclasses/z_subclass.rb', 'w') << z_subclass).close

puts 'Files created, run "ruby base_class.rb to test"'