protected void usage(String message) {
    if (message != null) {
      System.err.println(message);
      System.err.println("");
    }

    System.err.println(getUsage());
  }
Print usage information for this command line.
@param message if not null, print this message before the usage info.
hbase-server/src/main/java/org/apache/hadoop/hbase/util/ServerCommandLine.java