How can I retrieve the Process ID of a recently started process in Java?

Retrieving Process ID of Recently Started Process in Java

To initiate a new process, the ProcessBuilder class and its start() method can be employed. However, subsequently determining the PID (process identifier) of the process remains a distinct challenge.

In Java 9 and later versions, a straightforward solution is provided through the pid() method of the Process class. This method returns the PID of the process as a long value. The implementation below demonstrates this approach:

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

In this example, after starting the process with pb.start(), the pid() method retrieves and assigns the PID to the pid variable. Alternatively, if the Java version is prior to Java 9, external tools or libraries may be necessary to obtain the PID.

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