Log4j is an open source project Apache, by using Log4j, we can control the log information delivery destination file, console, GUI components, and even set interface server, NT, UNIX Syslog event logger daemon; we can also control the output format of each log by defining each; a log information level, we can generate a more detailed process control log. Most interesting is that these can be configured flexibly through a configuration file without the need to modify the code for the application.

log4j\commons-logging.jar
log4j\log4j.jar
log4j

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