jruby_actually_java_bug.rb

require 'jruby'
require 'pp'

JFrame = javax.swing.JFrame
JCheckBox = javax.swing.JCheckBox
JOptionPane = javax.swing.JOptionPane

class JCheckBox
  
   def on_clicked &block
     add_item_listener { |e|
	   block.call isSelected
	 }
   end
   
end


module SimpleGuiCreator

 def self.go
 # javax.swing.SwingUtilities.invokeLater{
    temp_frame = JFrame.new
	temp_frame.show
	
    begin
	    JOptionPane.showMessageDialog(temp_frame, "message", "title", JOptionPane::INFORMATION_MESSAGE)
	ensure
	  temp_frame.dispose
	end
   #}

	
  end
end

class Go

  def self.go
    frame = JFrame.new
	checkbox = javax.swing.JCheckBox.new
	frame.add(checkbox)
	checkbox.on_clicked { |new_value|
	  puts "after_checked #{new_value}"
	  pp caller(0)
	  SimpleGuiCreator.go
	}
	frame.setSize(200,200)
	frame.show
	puts "done showing"
  end
  

end


Go.go