def log s
    model.log +=s
#update_view <- this freezes swing app on a java exception
    puts s
  end

  def execute_button_action_performed

    model.code = view_state.model.code
        repaint_while {
          @run_thread = Thread.new {
            begin
              eval(model.code)
            rescue Exception, NativeException => exc
              log exc
              Thread.kill
            end
         }
        }
    update_view # this is my solution, but logging is not in realtime :/
  end