A DESCRIPTION OF THE PROBLEM :
Typo in the javadoc. You can read "the node represets a leaf" instead of "represents"
In the getTreeCellRendererComponent method documentation

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
"represents"
ACTUAL -
"represets"

URL OF FAULTY DOCUMENTATION :
http://java.sun.com/j2se/1.5.0/docs/api/javax/swing/tree/TreeCellRenderer.html