Log4j fails to log into file

Question

I googled "Spring + log4j", and here is what I get. When running Eclipse + Tomcat, I can see logs in Eclipse console, but I can't find any custom log file in Tomcat. Is there any thing misconfigured in my log4j.properties?

# Root Logger
log4j.rootLogger=DEBUG, stdout, logfile  

### direct log messages to stdout ###  
log4j.logger.com.ibatis = DEBUG, logfile  
log4j.logger.com.ibatis.common.jdbc.SimpleDataSource = DEBUG, logfile  
log4j.logger.com.ibatis.common.jdbc.ScriptRunner = DEBUG, logfile  
log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate = DEBUG, logfile  

log4j.logger.java.sql.Connection = DEBUG, logfile  
log4j.logger.java.sql.Statement = DEBUG, logfile  
log4j.logger.java.sql.PreparedStatement = DEBUG, logfile  
log4j.logger.java.sql.ResultSet = DEBUG, logfile  

############################## Console Log Configuration ##############################  
log4j.appender.stdout=org.apache.log4j.ConsoleAppender  
log4j.appender.stdout.Target=System.out  
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout  
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
# log4j.appender.logfile.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} [%5p] - %c -%F(%L) -%m%n 

############################## File Log Configuration ##############################  
log4j.appender.logfile = org.apache.log4j.DailyRollingFileAppender   
log4j.appender.logfile.layout.ConversionPattern = %d{ABSOLUTE} %5p %c{1}:%L - %m%n
log4j.appender.logfile.layout = org.apache.log4j.PatternLayout  
log4j.appender.logfile.MaxFileSize = 100K  
log4j.appender.logfile.MaxBackupIndex = 100 
log4j.appender.logfile.File = ${webApp.root}/logs/swinguserver.log  
log4j.appender.logfile.DatePattern = '.'yyyy-MM-dd
# What does Append=true mean?
log4j.appender.logfile.Append=true

${webApp.root} is declared in web.xml:

<context-param>
    <param-name>webAppRootKey</param-name>
    <param-value>webApp.root</param-value>
</context-param>

<context-param>
    <param-name>log4jConfigLocation</param-name>
    <param-value>/WEB-INF/classes/log4j.properties</param-value>
</context-param>

<context-param>
    <param-name>log4jRefreshInterval</param-name>
    <param-value>60000</param-value>
</context-param>

<listener>
    <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>

I thought swinguserver.log would be created in D:\Apache Software Foundation\Tomcat 7.0\webapps\ROOT\logs, but nothing is.

When I change ${webApp.root} to ${catalina.home} as @SachinSarawgi suggested, I can get swinguserver.log under Tomcat 7.0\logs. How could I configure log4j to write log under Tomcat 7.0/webapps/ROOT/logs?

Thank you for any help.

In place of ${webApp.root} please try to use ${catalina.home} and check if you are getting log file. — SachinSarawgi
Have you tried searching for *.log in that tree under webapps? And in config it sais "logs" , not "log" — Fildor
@SachinSarawgi Yes, I can get swinguserver.log file in Tomcat 7.0\logs folder when using ${catalina.home} — Rangtian
@Fildor I've searched, but get nothing. And when I change ${webApp.root} to ${catalina.home}, I can get swinguserver.log under Tomcat 7.0\logs. How could I configure log4j to write log under webapps/ROOT/logs? — Rangtian

SachinSarawgi SachinSarawgi · Accepted Answer · 2017-02-16T09:33:59

In place of ${webApp.root} please try to use ${catalina.home}.

When you use ${catalina.home}it will point to your tomcat directory. You can find catalina.home variable in your catalina.sh or catalina.bat file.

If you want log inside ROOT directory just edit the location as follows:

${catalina.home}\/webapps\/ROOT\/logs\/swinguserver.log.

This will direct the log to your ROOT/logs directory.

Log4j fails to log into file

1 Answers