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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.

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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.

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