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Log4j
Java-based logging utility. It is used as standard logger nowadays. Log4j allows logging on class-by-class basis i.e., each class can be covered. Through Log4j we can turn on or off the logging at runtime by changing the configuration file.
| First released | 2001 |
| Developed by | Ceki Gülcü, Apache Software Foundation |
| Latest stable version | 2 |
| Open-source | Not defined |
Interesting facts
Log4j has certainly various advantages over System.out.println firstly being checking the output the sout outputs to standard output which is mostly a console window whereas the output from Log4j can be to the console or email server,database table or a log file.