Process via ProcessBuilder isn't running

[crikey]

@Override
    public void run() {
        File file = new File("./MyJar.jar");
 
        ProcessBuilder pb = null;
 
        try {
            System.out.println(file.getCanonicalPath());
            pb = new ProcessBuilder("java", " -Djava.net.preferIPv4Stack=true -Xbootclasspath/p:" + file.getCanonicalPath()+  "-jar",  file.getCanonicalPath());
            pb.directory(new File("./"));
        } catch (IOException e) {
            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
        }
        //pb.directory(new File("./"));
 
        BufferedReader stdInput = null;
        try {
            Process proc = pb.start();
            System.out.println("program started started");
 
            proc.waitFor();
        } catch (IOException e) {
            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
        } catch (InterruptedException e) {
            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
        }
 
 
    }

When I run this, nothing happens. What could be the problem? I'm trying to run a JAR file with VM parameters

[doWhile]

Get the output and error Stream from the process, and read them
See When Runtime.exec() won't - JavaWorld