nginx can be used as HTTP server and as a load balancer at the same time. In this screencast I used nginx to share the load between two TomEE 7.0.2 instances on Docker.
The Dockerfiles in this screencast were borrowed from: docklands. Binary images are also available from: hub.docker.com/u/airhacks/. The ping healthcheck is directly available from github.com/AdamBien/ping
Also see how HA Proxy can be used to load balance Java EE microservices.
You want to learn more about Java EE and Microservices? Checkout: Java EE Microservices. Is Munich's airport too far? Learn from home: javaeemicro.services.