Can I execute a node.js script from a Java Class?

Question

I am currently developing a Java system that communicates with node.js using socket.io. The system and the script are on the same server. How can I execute the script from my Java code and keep it alive from my app?

willbush · Accepted Answer · 2016-11-04 05:29:03Z

6

Note when using process builder the path to your JavaScript file is an argument and "node" is the command, so they need to be separated:

ProcessBuilder pb = new ProcessBuilder("node", "app.js");

This is also useful for inheriting its console output, starting the process and getting the reference to the process:

pb.redirectOutput(ProcessBuilder.Redirect.INHERIT);
pb.redirectError(ProcessBuilder.Redirect.INHERIT);
Process p = pb.start();

answered Nov 4, 2016 at 5:29

willbush

3305 silver badges7 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Calvin Zhang · Accepted Answer · 2013-05-22 15:39:55Z

5

Say you have a node.js script named "mynodejs.js". You can use the following java code:

Process p = Runtime.getRuntime().exec("node mynodejs.js");

or

ProcessBuilder b = new ProcessBuilder("node mynodejs.js", "-args");

answered May 22, 2013 at 15:39

Calvin Zhang

9568 silver badges8 bronze badges

2 Comments

B. TIger Over a year ago

Im having problems executing these comands I always get an error saying that node is not a program but I dont get this error executing from the terminal is my app not reading the environment variables correctly

Calvin Zhang Over a year ago

Be sure your node.exe is in your system path or you may want to use something like this: Process p = Runtime.getRuntime().exec("C:\\Program Files\\nodejs\\node.exe mynodejs.js");

Luiggi Mendoza · Accepted Answer · 2013-05-22 16:55:01Z

1

Have a look at ProcessBuilder class.

You can start any process on your machine like you would via shell, if I understand your question correctly.

edited May 22, 2013 at 16:55

Luiggi Mendoza

85.9k16 gold badges160 silver badges354 bronze badges

answered May 22, 2013 at 15:29

rawphl

3312 silver badges8 bronze badges

1 Comment

Sotirios Delimanolis Over a year ago

Java 7 ProcessBuilder is even better. It allows piping: docs.oracle.com/javase/7/docs/api/java/lang/ProcessBuilder.html

Collectives™ on Stack Overflow

Can I execute a node.js script from a Java Class?

3 Answers 3

Comments

2 Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

2 Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related