logj4 config

Hi,
everthing sended to   console is written in catalina.out.

log4j.properties configuration file:


log4j.debug=true

log4j.rootLogger=DEBUG, CONSOLE #  your log level ... that will write  all logs in catalina

log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%d [%t] %-5p %c - %m%n
log4j.appender.CONSOLE.layout.ConversionPattern=%c %-5p %d [%t] - %m%n


or  in  xml configuration:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">

<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
  <appender name="console" class="org.apache.log4j.ConsoleAppender">
    <param name="Target" value="System.out"/>
    <layout class="org.apache.log4j.PatternLayout">
      <param name="ConversionPattern" value="%-5p %c{1} - %m%n"/>
    </layout>
  </appender>
 <root>
    <priority value ="debug" />
    <appender-ref ref="console" />
  </root>
 
</log4j:configuration>

a useful link http://logging.apache.org/log4j/docs/manual.html ( it describes how can you configurate log4j for tomcat etc).

 

but don't see how this bound with a specifica webapp

you have to put the log4j.properties file in WEB-INF/classes folder.

When the server starts,

It loads all the classes in classes folder, and if log4.properties file is present in classes folder. The log4j property gets set for that particular appliaction.