TLS support isn't exposed idomatically in Java

[voutilad]

Having researched how to use TLS on dialers/listeners, it should be possible as-is, but definitely would require the developer to know the underlying nng api and work with JNI stuff.

A Java developer should (assuming TLS is available) be able to use traditional Java approaches for referencing the cert/key files (e.g. java.io.File or java.nio.file.Path).