public synchronized String convertByteToHexString(byte[] raw){
	  String hexString="";
	  for(int i=0;i<raw.length;i++){
		  String hex=Integer.toHexString(raw[i]);
		  if(hex.length()<2){
			  hex="0"+hex;
		  }
			 hex=hex.substring(hex.length()-2);
		  hexString=hexString+hex;
	  }
	  return hexString;
  }