I am using JWNL1.3 rc3 and Wordnet 2.0.
When I try to find the antonym relation between two
synset with RelationshipFinder.findRelationships
((Synset sourceSynset, Synset targetSynset,
PointerType type) method, it always return an empty
RelationshipList object even if there is really a antonym
relation in wordnet such as the synset of "beautiful" and
the synset of "ugly".
I fixed this in my fork at http://extjwnl.sourceforge.net/
Aliaksandr