How to connect NodeJS and Java?

Question

I need for my Node application to be able to send and recieve data to/from an already running Java app or to launch Java app from Node.

So, is there a way to send data from NodeJS to Java and back?

My goal is to have something like this:

// In Java:
J2JSInterface.setReciever(msg -> System.out.println("Message from JS: " + msg));
J2JSInterface.send("Hello from Java!");

// In Java console:
// Message from JS: Hello from JS!

// In Node:
JS2JInterface.setReciever(msg => console.log(`Message from Java: ${msg}`))
JS2JInterface.send("Hello from JS!")

// In Node console:
// Message from Java: Hello from Java!

P.S.: I Tried using JNI and Node Api in one C++ library together, (code) but it won't work because Node and Java will load two independent instances of the library and these instances can't interact with each other. (or can they?)

Answer 1

I really tend to overcomplicate things...

TCP is the solution for really fast communicating. When I checked the latency, I was shocked, because it was around 0 to 1 ms. Thanks to AhmetU?ur for pointing out that I could just use websockets!