Logging examples

logging.txt

//Developer friendly
{ "sender" : "michael",
  "recipient": {
    "name" : "michael",
    "name" : "andrea",
    "name" : "itay"
    }
  subject: "I heart logs"
}

//Create logger
Logger logger = Logger.getLogger(MyClass.class.getName());


logger.trace("Number is {}", getRandomNumber());

//Traditional, Guarded Logging
if (logger.isTraceEnabled()) {
    logger.trace("Number is {}", getRandomNumer());
}

//Parameterized Logging
logger.debug("PARAMETERIZED: {}", slow);
logger.debug("{}", expensiveOperation());


//The lambda expression is only evaluated if the corresponding log level is enabled. or lazy logging
logger.trace("Number is {}", () -> getRandomNumber());




{
  "@timestamp": "2017-07025 17:02:12",
  "level": "error",
  "message": "connection refused",
  "service": "listener",
  "thread": "125",
  "customerid": "776622",
  "ip": "34.124.233.12",
  "queryid": "45"
}


//Formatting
{
  "@timestamp": "2017-07025 17:02:12",
  "level": "error",
  "message": "connection refused",
  "service": "listener",
  "thread": "125",
  "customerid": "776622",
  "ip": "34.124.233.12",
  "queryid": "45"
}


//Provide context
12-19-17 13:40:42:000 login failed.
12-19-17 13:40:42:000 userId=23 action=login status=failure