Agent Development and Implementation

As requested by a student, I would like to introduce to you a commonly used Java platform for agents is JADE:
http://jade.tilab.com/

It supports ontology in its form. See this tutorial:
http://www.ryerson.ca/~dgrimsha/courses/cps720/JADEOntology.html

Explicit OWL/RDF support for JADE is available:
http://agentowl.sourceforge.net/

which is based on Jena:
http://jena.sourceforge.net/

Protege has a plugin for generating Java files representing an ontology that can be used with the environment:
http://protege.cim3.net/cgi-bin/wiki.pl?OntologyBeanGenerator