I try to execute the following code:

*

try
{
 Process process = Runtime.getRuntime().exec("su");
    // blah blah
}
catch (Exception e)
{
 res += "ERROR " + e.getMessage() + "\n";
}

*

And I get the following exception::

Error running exec(). Command: [su] Working Directory: null Environment:
null

Any reason why?
Do I need "root" access on my device?

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