Large amount of open files for jsf-impl on AS 7

Basically what I am seeing is the amount of open files for the jsf-impl increasing steadily the longer the app server is running.

/usr/local/jboss-as-7.1.0.Final/modules/com/sun/jsf-impl/main/jsf-impl-2.1.5-jbossorg-1.jar

watching via

ls -lha /proc/xxxx/fd | grep jsf-impl | wc

I can see the file count increase with every page load.

What info is needed to dig into this deeper?