log4j XML example

1. Output to Console

Redirect the logging to console.

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration debug="true"
xmlns:log4j='http://jakarta.apache.org/log4j/'>
 
<appender name="console" class="org.apache.log4j.ConsoleAppender">
   <layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" 
 value="%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n" />
   </layout>
</appender>
 
<root>
<level value="DEBUG" />
<appender-ref ref="console" />
</root> 
</log4j:configuration>


2. Output to File

Redirect the logging to a file..

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration debug="true"
xmlns:log4j='http://jakarta.apache.org/log4j/'>
 
<appender name="file" class="org.apache.log4j.RollingFileAppender">
  <param name="append" value="false" />
  <param name="maxFileSize" value="10KB" />
  <param name="maxBackupIndex" value="5" />
  <!-- For Tomcat -->
  <param name="file" value="${catalina.home}/logs/myStruts1App.log" />
  <layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" 
value="%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n" />
  </layout>
</appender>
 
<root>
<level value="ERROR" />
<appender-ref ref="file" />
</root>
 
</log4j:configuration>


3. Output to Console and File

Full example to output the logging to both console and file


<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration debug="true"
  xmlns:log4j='http://jakarta.apache.org/log4j/'>
 
<appender name="console" class="org.apache.log4j.ConsoleAppender">
   <layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" 
value="%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n" />
   </layout>
</appender>
 
<appender name="file" class="org.apache.log4j.RollingFileAppender">
   <param name="append" value="false" />
   <param name="maxFileSize" value="10MB" />
   <param name="maxBackupIndex" value="10" />
   <param name="file" value="${catalina.home}/logs/myStruts1App.log" />
   <layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" 
value="%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n" />
   </layout>
</appender>
 
<root>
<level value="DEBUG" />
<appender-ref ref="console" />
<appender-ref ref="file" />
</root>
 
</log4j:configuration>
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