William Wallace Flint III
I was also getting a NullPointerException when running Examples.java. And I was also curious why three different downloads - rc1, rc2, and rc3. Then I poked around in the source code, and noticed rc3 had the latest version of some .java files. So I tried running Examples.java from the rc3 unzipped stuff, and it worked fine with Wordnet 2.0 - no NullPointerException.
(I was running it from the rc1 unzipped stuff before, when I got the NullPointerException.)