Phoenix specific JRMP Exporters for Activation and Registry don't play well with jdk9 as they access sun.* classes.
Only the Registry exporter is required, to allow ActivationGroup to find the ActivationSystem using the RMI Registry. There are JERI alternatives for all other Phoenix's exported remote objects. Phoenix has its own read-only Registry implementation. I think it would be wise to deprecate all JRMP Exporters, given their recent removal from the 2.2.x branch. Phoenix can use the standard RMI registry instead by default, I propose three configuration entries to allow Phoenix to create a standard RMI Registry using only public hava api's, with specified port and RMI SocketFactory instances, which allow users to use TLS should they wish to prevent unauthorised access to the Registry. Regards, Peter. Sent from my Samsung device.