public FileSendPacket send(File file,SendListener listener){
  if (!file.exists())   throw new NullPointerException("Not Find: " + file.getPath());
  FileSendPacket entity=new FileSendPacket(file,listener);
  send(entity);
  return entity;
}

public FileSendPacket send ( File file , SendListener listener ) { if ( ! file . exists ( ) ) throw new NullPointerException ( "Not Find: " + file . getPath ( ) ) ; FileSendPacket entity = new FileSendPacket ( file , listener ) ; send ( entity ) ; return entity ; }
send file to queue
