why some fields lack when i send my spring logs to a remote server using syslogappender?

this is my part of code.i use log.info() function to send to my rsyslog server,but the format is different from my console log.

public class Syslog
{
    private static final Logger log = LoggerFactory.getLogger(Syslog.class);
    public static void main(String[] args)
    {
        User user1 = new User("张三",12, "male", "shenzhen");
        User user2 = new User("李四", 45, "male", "shanghaoi");
        User user3 = new User("王五", 34, "female", "wuhan");
        User user4 = new User("赵六", 44, "female", "hangzhu");
        String s = JSONObject.toJSONString(user1);
        while(true)
          {
              try {
                  log.info("{}",JSONObject.toJSONString(user2));
                  log.info("{}",JSONObject.toJSONString(user3));
                  log.info("{}",JSONObject.toJSONString(user4));
                  Thread.sleep(3000);
              } catch (Exception e) {
                  e.printStackTrace();
              }
          }

    }
}