A DESCRIPTION OF THE PROBLEM :
There's another typo in the documentation of method getPopupLocation(MouseEvent) in javax.swing.JComponent
There is already a bug-report (http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6190823) describing the second typo in this method-comment

The typo itself is in the last sentance of the description for the method

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
If null is returned the look and feel will choose a suitable location
ACTUAL -
If null is truend the look and feel will choose a suitable location

URL OF FAULTY DOCUMENTATION :
http://java.sun.com/j2se/1.5.0/docs/api/javax/swing/JComponent.html#getPopupLocation(java.awt.event.MouseEvent)