Why ProcessBuilder takes more time to perform a task?

Question

I run analysis on a file directly from an analyzer program and it finishes under one minute. But if I make jar of analyzer and run it via ProcessBuilder, it does not get finished even in 8 minutes (500 sec). Here is the code I am using for ProcessBuilder. Can someone please explain the reason?

I cannot run the analyzer program directly because depending upon the input file, it may actually take 15-20 minutes which I don't want. I want to finish it under 8 minutes.

Here is code for ProcessBuilder.

public void myFun(){

    String fileName = file.getName();
    System.out.println(file.getAbsolutePath());

    Process p;
    ProcessBuilder pb;
    String filePath = file.getAbsolutePath();

        pb = new ProcessBuilder("C:\\Program Files\\Java\\jdk1.7.0_13\\bin\\java.exe", "-jar", "ta.jar", filePath);
        pb.directory(new File("D:\\Softwares\\analyzerRun\\bin"));

        long startTime = System.currentTimeMillis();

        try {
            p = pb.start();
            long currTime = System.currentTimeMillis();
            long diff = currTime - startTime;

            boolean isBreak = false;
            while(diff < 500000)
            {
                currTime = System.currentTimeMillis();
                diff = currTime - startTime;

                if(processIsTerminated(p))
                {
                    isBreak = true;
                    break;
                }
            }
            if(!isBreak)
            {
                System.out.println("Interrupting current thread!!");
                p.destroy();
                Thread.currentThread().interrupt();
            }
            else
            {
                System.out.println("process terminated peacefully");
            }
            System.out.println("Done with "+ fileName);
        } catch (IOException e) {
            e.printStackTrace();
        } 
    }
}

private static boolean processIsTerminated (Process process) {
    try {
        process.exitValue();
    } catch (IllegalThreadStateException itse) {
        return false;
    }
    return true;
}

Edit1:

So after given suggestions, I removed while loop and my try code looks like below now:

try {
    p = pb.start();
    p.waitFor();
}

Interestingly, I run this program and it does not get finished under 5 minutes. But if I run my analyzer directly, it gets finished under 30 seconds. Does ProcessBuilder not get enough priority from CPU?

Answer 1

To answer this, "Interestingly, I run this program and it does not get finished under 5 minutes. But if I run my analyzer directly, it gets finished under 30 seconds. Does ProcessBuilder not get enough priority from CPU? "

After a long-time, I finally figured out that I was writing two lines on standard output in my original program. So, when I ran the jar file using ProcessBuilder, I didn't read from standard output. The process was getting hanged ultimately getting killed by the main-class thread. I just removed those two lines from the original program and now it takes equal time in both ways.