A DESCRIPTION OF THE PROBLEM :
There was a typo. In the second paragraph, the description of setContentPane(Container) reads "The contentPane my not be null." Instead, it should read "The contentPane <b>may</b> not be null."

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The contentPane may not be null.
ACTUAL -
The contentPane my not be null.

URL OF FAULTY DOCUMENTATION :
http://java.sun.com/j2se/1.5.0/docs/api/javax/swing/RootPaneContainer.html#setContentPane(java.awt.Container)
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