How to Get the PID of a Process Launched from Java?

Retrieving the PID of a Process Started from Java

When launching a process from within a Java program, it may be necessary to obtain the process's identification number (PID). This information is crucial for tasks such as process management, synchronization, and control.

To start a process, the ProcessBuilder class is typically utilized. The following code snippet demonstrates how to launch a process:

<code class="java">ProcessBuilder pb = new ProcessBuilder("cmd", "/c", "path");
try {
    Process p = pb.start();       
} 
catch (IOException ex) {}</code>

Retrieving the PID

In Java 8 and earlier versions, obtaining the PID of the started process was not straightforward. However, with the introduction of Java 9, the Process class gained a new method called pid(). This method directly returns the process's ID.

To use this method, simply add the following line of code:

<code class="java">long pid = p.pid();  // where 'p' is the Process object</code>

This line assigns the PID of the started process to the variable pid.

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