Minecraft Java and Xbox 360 together in multiplayer?

I want to play Minecraft with a friend, I use the Java version, he plays it on the Xbox. Now we want to play together, but we're not in the same network. Server is there, but how can we connect or how does that work?

That wouldn't work because he would also need the java or you the Xbox

That doesn't work because you're playing with two different minecraft versions.