force create a directory using bash command through java code

I am in some trouble. I am trying to force create a folder using bash command through java code in linux server. My code is as followes-

String command = "/root/new_scripts/makedir.sh /webroot/Own";
    try {
        Runtime runtime = Runtime.getRuntime();
        Process process = runtime.exec(command);
        return "true";
    } catch (Exception ex) {
        return ex.toString();
    }

and the makedir.sh files contains

#!/bin/bash
mkdir $1

But it cannt create a directory.

And also try to create a directory just using java code is as following-

String s = null;
    try {
        Process p = Runtime.getRuntime().exec("mkdir /webroot/Own");
        BufferedReader stdInput = new BufferedReader(new InputStreamReader(p.getInputStream()));
        BufferedReader stdError = new BufferedReader(new InputStreamReader(p.getErrorStream()));
        // read the output from the command
        System.out.println("\n\n\nHere is the standard output of the command:\n");
        while ((s = stdInput.readLine()) != null) {
            System.out.println(s);
        }
        // read any errors from the attempted command
        System.out.println("Here is the standard error of the command (if any):\n");
        while ((s = stdError.readLine()) != null) {
            System.out.println(s);
        }
    } catch (Exception ex) {
        System.out.println("\n\n\nexception happened - here's what I know: ");
        ex.printStackTrace();
    }

But it gives me the following error-

Here is the standard output of the command:

Here is the standard error of the command (if any):

mkdir: cannot create directory `/webroot/Own': Permission denied