How to Get the PID of a Recently Started Process in Java?

Retrieving the PID of a Recently Started Process in Java

When starting a process using the ProcessBuilder class in Java, there may be a need to obtain its process ID (PID) for further operations. This article addresses this requirement by showcasing a straightforward method available in Java 9 and above.

To launch a process, you can utilize the following code:

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

To determine the PID of the process that was just started, Java 9 introduced a convenient API in the Process class. The pid() method effectively retrieves the PID of the process, making this task effortless:

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

By leveraging this enhanced functionality, you can seamlessly obtain the PID of the process you've recently initiated within your Java program.

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