java version "1.5.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-b64)
Java HotSpot(TM) Client VM (build 1.5.0-b64, mixed mode)

DESCRIPTION OF THE PROBLEM :
In ZoneView's javadoc, there is the sentence:

"ZoneView extends BoxView to provide a box that implements zones for it's children."

it's != its. In this sentence, you want the posessive its, so no apostrophe is required.

http://java.sun.com/j2se/1.5.0/docs/api/javax/swing/text/ZoneView.html