A DESCRIPTION OF THE PROBLEM :
Under description for setContentPane there is a spelling error

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Spelling should be "may not be"
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