Very cool, but not really related to core internet functionality.
The truth is, Java is viewed as "not Unix friendly" by many people, whether deserved or not. I suspect the ISC folks fall squarely into this camp. My personal and thus purely anecdotal experience is near-universal hostility from network admins.
Despite this, there is a fair amount of network management software written in Java. OpenNMS and Cisco Prime Networks (an absolute beast) both spring to mind.
http://www.militaryaerospace.com/articles/2009/03/thales-cho...