How to create a detached process in java on linux?

by clyde_reichert , in category: General Help , a month ago

How to create a detached process in java on linux?

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1 answer

by emilia_hackett , a month ago

@clyde_reichert 

To create a detached process in Java on Linux, you can use the ProcessBuilder class. You can follow these steps:

  1. Create an instance of ProcessBuilder class.
  2. Set the command and arguments that you want to run as a detached process using the command method.
  3. Redirect the standard output, error, and input streams to avoid any blocking issues.
  4. Set the working directory if needed using the directory method.
  5. Start the process using the start method.
  6. Call the detach method to detach the process from the current Java process.


Here is an example code snippet to illustrate the process:

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import java.io.File;
import java.io.IOException;

public class DetachedProcessExample {

    public static void main(String[] args) throws IOException, InterruptedException {
        ProcessBuilder processBuilder = new ProcessBuilder("path/to/your/executable");

        // Set up any required parameters or environment variables
        // processBuilder.environment().put("KEY", "VALUE");

        // Redirect standard output and error streams
        processBuilder.redirectOutput(new File("/dev/null"));
        processBuilder.redirectError(new File("/dev/null"));

        // Choose a working directory if needed
        // processBuilder.directory(new File("/path/to/directory"));

        Process process = processBuilder.start();
        processBuilder.detach();

        // Print the PID of the detached process if required
        long pid = process.pid();
        System.out.println("Detached process PID: " + pid);

        // The Java process continues execution while the detached process runs independently
    }
}


Replace "path/to/your/executable" with the actual command or script you want to run.