在Linux环境中使用log4j进行日志轮换后，Tomcat无法登录到catalina.out

Question

I have used log4j to rotate catalina.out .After the first log rotation tomcat started logging to newly created file by log4j not to catalina.out in linux environment.Every thing works fine in windows environment.

Here's my log4j.properties

log4j.rootLogger=ALL, file

log4j.appender.file=org.apache.log4j.DailyRollingFileAppender
log4j.appender.file.File=${catalina.home}/logs/catalina.out
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=[Java] %d{yyyy-MM-dd HH:mm:ss} - %5p - %c{1} : Line No. %L - %m%n
log4j.appender.file.DatePattern='.'yyyy-MM-dd-HH
log4j.appender.FILE.Append=true

Please suggest.

Answer 1

The catalina.out file is actually created by output redirection from the shell when you launch Tomcat using bin/catalina.sh and friends. If you try to rotate that file using log4j, you will clobber that file with your log4j logs. tomcat is still logging to the old catalina.out, which no longer exists.

You should point log4j at a different log file and not rotate catalina.out at all. If you absolutely must rotate catalina.out, use another technique.

If your catalina.out is filling up with System.out.println garbage from applications, read about the swallowOutput option in Tomcat. That will capture System.out and System.err and redirect it to a file instead of dumping it to standard output.