At URL below :
http://perso.wanadoo.fr/jean-louis.pasturel/index.html#FR
or
http://perso.wanadoo.fr/jean-louis.pasturel/index.html#EN
you can find a light supervisor : quasi real time supervior and differed
supervisor
Licence LGPL.
To be used, for example, in the integration process of an application to
supervise application and system resources ( CPU, RAM, files, ...)
The author does not guarantee the product on a system in production

The software open-source used are :
- JSF => my-faces 1.1.1
- Servlet Container  => Winstone (light container)  or  Tomcat ( Tomcat
embedded in Jonas)
- mapping O/R => Hibernate 2.1.7
- database Postgres 8.1 or  Postgres 7.4
- Charts => JFreeChart, basic use

Your remarks interest me

Best regards
Jean-Louis