Why would you configure a webserver for a java process ? Just have every process include a webserver. At what address ? Well simple : any free address, then register the address you've started up on in zookeeper. Likewise, contact your dependencies by resolving them on zookeeper (this can be done using DNS if you want minimal changes. Protip: SRV records have both ip and port).

Having the webserver is useful for reasons beyond just being independant of the webserver itself, like exporting metrics. Making the logs inspectable. Getting thread dump, inspecting current state, ...