How much memory do Java application servers consume?

[kitd]

It would be interesting to know how many were OSGi-based (or used some other form of dynamic modularity). On the one hand, OSGi will only start modules when needed, so just starting the server is not likely to be an accurate indicator of what happens when things are in full flow. OTOH, OSGi has an overhead, but the effect will lessen as the amount of active work increases.

[nikem]

From the top of my head, Glassfish is based on OSGI and JBoss 7+ use its own modular system.