Import owlp_j2ee.zip into a new Java project in Eclipse.
To build it you will need to download Jess, Jena and JBOSS.

Download locations for the above:

Jena: http://jena.sourceforge.net/downloads.html
Jess: http://www.jessrules.com/jess/download.shtml
JBOSs application server: http://www.jboss.com/docs/index
Import all the jars from Jena, Jess and JBOSS libraries to compile the project.

The owl-p parser is owlp_j2ee/edu.ncsu.csc.mas.utils.Owlp2Jess.java
Run this to generate Jess rules from OWL-P.
The generated Jess rules are stored in .clp files in the same project directory.