Node.js run a java program?

Question

I have a simple nodejs server up and running. I am running into trouble when I try to spawn a child process. the jar file I am trying to access, is in the same directory as the node script. It takes in a command line argument that I am trying to pass in and it outputs data to the command line, which I am trying to pipe into the var child.

var child = require('child_process').spawn('java -jar done.jar',['argument to pass in']);

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

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

This produces the following error message:

events.js:85
      throw er; // Unhandled 'error' event
            ^
Error: spawn java -jar done.jar ENOENT
    at exports._errnoException (util.js:746:11)
    at Process.ChildProcess._handle.onexit (child_process.js:1046:32)
    at child_process.js:1137:20
    at process._tickCallback (node.js:355:11)

Any ideas?

Shouldn't it be spawn('java',[-jar', 'done.jar', 'etc...'])? — Leonid Beschastny
– Leonid Beschastny, Commented Mar 24, 2015 at 21:00

Brad · Accepted Answer · 2019-11-06 17:28:47Z

18

You're executing java. -jar and done.jar are arguments to pass.

var child = require('child_process').spawn(
  'java', ['-jar', 'done.jar', 'argument to pass in']
);

You will also need to specify the full path to java, or make sure that java is specified in the OS path.

edited Nov 6, 2019 at 17:28

answered Mar 24, 2015 at 21:01

Brad

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2 Comments

mathJohn Over a year ago

Thanks Brad, that did it! For anyone who has the same problem I didn't need to specify the full path to java.

Deb Over a year ago

Worked for me too! However , i had to mention the full path of the jar file.

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