Reason why appium server does not start using Java Process class

Is there any specific reason that appium server does not start with JAVA Process/Process Builder cass

                Process rc = Runtime.getRuntime().exec("cmd / && appium");
                   System.out.println("Runtime.getRuntime().exec done");
		InputStream is = rc.getInputStream();
		InputStreamReader isr = new InputStreamReader(is);
		BufferedReader br = new BufferedReader(isr);
		String line;	
		//String adb = new String();
		while ((line = br.readLine()) != null) {
		    if (line.length()>0){
			line += br.readLine();
			System.out.println("line: " +  line);
			if (line.contains("Appium REST http interface listener started on")) {
				System.out.println("Appium Started");