Are there any built in JMX exposed monitoring/statistics that can be enabled in Akka (Java), besides the Cluster MBean? I have looked at Typesafe Console, but since it requires a license to be used with collecting data from multiple nodes, I was hoping to be able to achieve the same with plain JMX. I have checked the Akka documentation without any luck on this topic.
No - the Cluster JMX support is it.
There are a couple of projects aimed at collecting data from Akka. Both are at very early stages at this point but the code could be a starting point for you.
Both are using AspectJ to get the data out of Akka.
Typesafe Console is free to use in non-Production environments, if that works for you.