Got it!!
@donga, Please try this.
public String deviceUDID() throws IOException{
ProcessBuilder builder = new ProcessBuilder("/bin/bash", "-c", "/usr/local/bin/idevice_id -l");
builder.redirectErrorStream(true);
Process p = builder.start();
BufferedReader r = new BufferedReader(new InputStreamReader(p.getInputStream()));
String line;
line = r.readLine();
System.out.println(line);
return line;
}