code to reproduce

backtrace

C:\dev\ruby\sensible-cinema\bin>..\..\downloads\jruby\bin\jruby.exe crash1.rb
RubyToJavaInvoker.java:221:in `findCallableArityOne': java.lang.ArrayIndexOutOfBoundsException: 1
        from InstanceMethodInvoker.java:56:in `call'
        from AliasMethod.java:61:in `call'
        from CachingCallSite.java:313:in `cacheAndCall'
        from CachingCallSite.java:152:in `call'
        from crash1.rb:23:in `method__3$RUBY$initialize'
        from crash1Invokermethod__3$RUBY$initializeFixed0#initialize:65535:in `call'
        from CachingCallSite.java:303:in `cacheAndCall'
        from CachingCallSite.java:121:in `callBlock'
        from CachingCallSite.java:126:in `call'
        from RubyClass.java:810:in `call'
        from DynamicMethod.java:180:in `call'
        from ConcreteJavaProxy.java:132:in `call'
        from CachingCallSite.java:293:in `cacheAndCall'
        from CachingCallSite.java:112:in `call'
        from crash1.rb:37:in `__file__'
        from crash1.rb:-1:in `load'
        from Ruby.java:688:in `runScript'
        from Ruby.java:571:in `runNormally'
        from Ruby.java:414:in `runFromMain'
        from Main.java:304:in `run'
        from Main.java:144:in `run'
        from Main.java:113:in `main'

crash1.rb

#!/usr/bin/ruby
require 'java'

module SensibleSwing 
 include_package 'javax.swing'
 [JButton, JFrame, JLabel, JPanel] # grab these constants (http://jira.codehaus.org/browse/JRUBY-5107)
 include_package 'java.awt'
 [FlowLayout, Font]
 include_class 'java.awt.event.ActionListener'
end

module SensibleSwing
 class MainWindow < JFrame
   def initialize
     super "Sensible-Cinema"
     setDefaultCloseOperation JFrame::EXIT_ON_CLOSE
     panel = JPanel.new
     panel.set_layout nil
     setSize 280,400
     add panel # why can't I just slap these down?
 
     jlabel = JLabel.new 'Welcome to Sensible Cinema'
     font happy = Font.new("Tahoma", Font::PLAIN, 11)
     jlabel.setFont(happy)
     jlabel.set_bounds(44,44,136,14)
     panel.add jlabel
     b = JButton.new( "Play Hulu, Youtube, or a DVD" ).on_clicked {
      self.close
      #go_sc
     }
     b.set_bounds(44,120,173,23)
     panel.add b
   end
 end
end

SensibleSwing::MainWindow.new.set_visible true