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6. Logging in Tomcat 7 > Loggers, appenders, and layouts
There are some important components of logging which we use at the time of implementing the logging mechanism for applications. Each term has its individual importance in tracking the events of the application. Let's discuss each term individually to find out their usage:
- Loggers: It can be defined as the logical name for the log file. This logical name is written in the application code. We can configure an independent logger for each application.
- Appenders: The process of generating logs is handled by appenders. There are many types of appenders, such as FileAppender, ConsoleAppender, SocketAppender, and so on, which are available in log4j. The following are some examples of appenders for log4j:
log4j.appender.CATALINA=org.apache.log4j.DailyRollingFileAppender log4j.appender.CATALINA.File=${catalina.base}/logs/catalina.out log4j.appender.CATALINA.Append=true log4j.appender.CATALINA.Encoding=UTF-8The previous four lines of appender define the DailyRollingFileAppender in log4j, where the filename is
catalina.out. These logs will have UTF-8 encoding enabled.# Roll-over the log once per day log4j.appender.CATALINA.DatePattern='.'dd-MM-yyyy'.log' log4j.appender.CATALINA.layout = org.apache.log4j.PatternLayout log4j.appender.CATALINA.layout.ConversionPattern = %d [%t] %-5p %c- %m%n
The previous three lines of code show the roll-over of the log once per day.
