Tomcat uses Log4j to output catalina.out log

Tomcat's default log uses java.util.logging, which has several shortcomings. The file catalian.out cannot be generated daily like log4j, and will become larger and larger. The log format is inconsistent with that printed by log4j in the project, which is not conducive to parsing.

I searched on the official website of Tomcat (https://tomcat.apache.org/tomcat-7.0-doc/logging.html) and found that by modifying some configurations and replacing the extension package, you can use log4j to output catalian.out.

Create a log4j.properties file in $CATALINA_BASE/lib

The content of log4j.properties is as follows:

log4j.rootLogger = INFO, CATALINA
# Define all the appenders
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-8
# Roll-over the log once per day
log4j.appender.CATALINA.DatePattern = '.'yyyy-MM-dd
log4j.appender.CATALINA.layout = org.apache.log4j.PatternLayout
#log4j.appender.CATALINA.layout.ConversionPattern = %d [%t] %-5p %c- %m%n
log4j.appender.CATALINA.layout.ConversionPattern = %d{yyyy-MM-dd HH:mm:ss.SSS} %p [%t] %c | %m%n
# configure customed log to catalina.out
log4j.logger.com.xxxxx = WARN, CATALINA
log4j.logger.org.apache = WARN, CATALINA
log4j.logger.org.mybatis = WARN, CATALINA
log4j.logger.java.sql = WARN, CATALINA
log4j.logger.org.springframework = WARN, CATALINA

Update tomcat related jar packages

Download log4j-1.2.17.jar (http://www.apache.org/dist/logging/log4j/1.2.17/)

Download two jar packages of tomcat7: tomcat-juli.jar and tomcat-juli-adapters.jar (http://www.apache.org/dist/tomcat/tomcat-7/v7.0.69/bin/extras/, preferably corresponding to the tomcat version)

Put log4j-1.2.17.jar and tomcat-juli-adapters.jar in $CATALINA_HOME/lib; replace $CATALINA_HOME/bin/tomcat-juli.jar with the newly downloaded tomcat-juli.jar.

Delete $CATALINA_BASE/conf/logging.properties.

Restart tomcat

About the default catalina log format

If you only want to change the default log format of Tomcat, just replace the default java.util.logging.SimpleFormatter . The format in the SimpleFormatter class is LoggingSupport.getSimpleFormat() , and its specific value is: "%1$tb %1$td, %1$tY %1$tl:%1$tM:%1$tS %1$Tp %2$s%n%4$s: %5$s%6$s%n", where the time format may not be what we expect, and there is a line break %n in it. For example, if you want to change to a time format similar to the log4j above, you can rewrite a replacement class (com.xxx.LogFormatter) by yourself and set the format to "%1$tY-%1$tm-%1$td %1$tH:%1$tM:%1$tS.%1$tL %4$s %2$s %5$s%6$s%n". Modify $CATALINA_BASE/conf/logging.properties

java.util.logging.ConsoleHandler.formatter = java.util.logging.SimpleFormatter

Change it to the following:

java.util.logging.ConsoleHandler.formatter = com.xxx.LogFormatter
org.apache.juli.FileHandler.formatter = com.xxx.LogFormatter

Summarize

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