What is the best approach for IPC between Java and C++?

Question

I would like to implement a robust IPC solution between a single JVM app (one process, potentially multiple threads) and a native C++ application that is linked to a C++ dll

Answer 1

I'd use a standard TCP/IP socket, where the app listens on some port and the library connects to it to report what it has to report and expect the answers.

The abstraction is robust, well supported and will have no interop issues.