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
– OneCricketeer, Commented Oct 25, 2016 at 20:25
There is another question and answer like this in here. stackoverflow.com/questions/5775088/… — Hakan SONMEZ
– Hakan SONMEZ, Commented Oct 25, 2016 at 20:51
Run the Java file with .spawn() or .exec() like you would run any external process and then examine stdout. — jfriend00
– jfriend00, Commented Oct 25, 2016 at 21:26

Denis Lisitskiy · Accepted Answer · 2016-10-25 21:12:35Z

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, 2016 at 21:12

Denis Lisitskiy

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1 Comment

sameer joshi Over a year ago

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

Roberg · Accepted Answer · 2018-01-03 00:40:40Z

1

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

answered Jan 3, 2018 at 0:40

Roberg

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