This Naggregator package expects a PostgreSQL Version 8.x database backend.
The PostgreSQL-bound Naggregator instance can be downloaded from the download section of the sourceforge.net page.
After these modifications, you can deploy the EAR file to the deployment directory of your JBoss server (e.g. $JBOSS_HOME/server/default/deploy). Open your browser and have a look at (assuming a local JBoss installation) http://localhost:8080/nag-web-jsp/user/entry/welcome.