Help with broken code

Hello,

The demo program below used to work, but now, when the button is clicked, nothing happens, although the window displaying the button does open just fine.  I run it in the Macintosh Unix terminal.  Any assistance with this problem would be greatly appreciated.

Rafael Bejarano

from javax.swing import JButton, JFrame
frame = JFrame('Hello, Jython!', defaultCloseOperation = JFrame.EXIT_ON_CLOSE, size = (300,300))
def change_text(event):
	print "Clicked!"

button = JButton('Click Me!', actionPerformed=change_text)
frame.add(button)
frame.visible = True
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