A DESCRIPTION OF THE PROBLEM :
Hi, I think that there is a typo in the paintComponent documentation

The 4th sentence in the second paragraph says "Further, if you do not invoker super's implementation ...".

I think you might have meant it to be Invoke.


URL OF FAULTY DOCUMENTATION :
http://docs.oracle.com/javase/7/docs/api/javax/swing/JComponent.html#paintComponent(java.awt.Graphics)