IPC (inter process communication) between python and java

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First, a little explanation of why I'm asking this question in the first place: I'm writing a python program (with a wxPython gui) that needs to call a Java AWT program from python and extract data from it. I have an in-process working solution on Windows. I also have an in-process solution on OSX so long as I run the Java app headless. Unfortunately there is no reasonable solution that I have found for running both GUIs within the same process on OSX because both AWT and WX both want the first thread and cannot share the wx message loop.

What I would like to do is to launch a Java program in a separate process from my Python program and establish a pipe or queue or something for passing data (specifically byte arrays) back and forth.

I'd greatly appreciate any suggestions, or even a nudge in the right direction as I have very little experience with IPC.

multiple-processes ipc multiprocessing python java
6 Answers

IPC using subprocess from in python

IPC.java file here java code will receive number and send square of it. 

import java.util.Scanner;

public class IPC {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String data="";
        while(scanner.hasNext()){
            // Receive data from Python code 
            data = scanner.nextLine();

            // Process data (calculate square)
            int x = Integer.parseInt(data);
            int square = x*x;


            // Send data to python code
            System.out.println(square);
        }
        scanner.close();
    }
}

IPC.py file

import subprocess
subprocess.run(["javac", "IPC.java"])
proc = subprocess.Popen(["java", "IPC"], stdin=subprocess.PIPE, stdout=subprocess.PIPE)
for i in range(10):
    # Send to java code
    proc.stdin.write(b'%d\n' % i)
    proc.stdin.flush()
    proc.stdout.flush()

    # Receive data from java code
    output = proc.stdout.readline()
    print (output.rstrip())
proc.communicate()
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