Node: Run a Java file and return response

Question

Is it possible to run a Java file from a node application, and get the response of it? For example something as simple as:

package com.app;

public class App {
    public static void main(String[] args) {
        System.out.println('Hello World');
    }
}

And I want to get the response Hello World

Your node app would have to compile that class, then sure, you can capture the standard output just like any other process... — OneCricketeer, Oct 25 '16 at 20:25
There is another question and answer like this in here. http://stackoverflow.com/questions/5775088/is-it-possible-to-execute-an-external-program-from-within-node-js — Hakan SONMEZ, Oct 25 '16 at 20:51
Run the Java file with `.spawn()` or `.exec()` like you would run any external process and then examine `stdout`. — jfriend00, Oct 25 '16 at 21:26

score 5 · Accepted Answer · answered Oct 25 '16 at 21:12

5

Compile you java file
execute it by node? in this way

let childProcess = require('child_process').spawn(
      'java', ['-jar', 'yureJavaFile.jar']
    );

childProcess.stdout.on('data', function(data) {
    console.log(data);
});

childProcess.stderr.on("data", function (data) {
    console.log(data);
});

answered Oct 25 '16 at 21:12

Denis Lisitskiy

1,285
11
15

Hello Sir i too have same problem but in my case on running of jar it accepts multiple inputs from jar ...how to get this from node – sameer joshi Dec 04 '18 at 11:25

score 1 · Answer 2 · answered Jan 03 '18 at 00:40

If you want to do more complex interaction between java and node you may want to look at node-java. It allows you to create and handle Java objects in a node application and call Java functions in external java class files or jars.

var ArrayList = java.import('java.util.ArrayList');
var list3 = new ArrayList();
list3.addSync('item1');
list3.equalsSync(list1); // true

Node: Run a Java file and return response

2 Answers2