log4j.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">

  <appender name="STDOUT" class="org.apache.log4j.ConsoleAppender">
    <param name="Target" value="System.out" /> 
    <param name="ImmediateFlush" value="true" />
    <layout class="org.apache.log4j.PatternLayout">
      <param name="ConversionPattern" value="%-5p %d [%t] %c: %m%n" />
    </layout>
  </appender>

  <appender name="STDERR" class="org.apache.log4j.ConsoleAppender">
    <param name="Target" value="System.err" /> 
    <param name="ImmediateFlush" value="true" />
    <layout class="org.apache.log4j.PatternLayout">
      <param name="ConversionPattern" value="%-5p %d [%t] %c: %m%n" />
    </layout>
  </appender>

  <appender name="FILE" class="org.apache.log4j.RollingFileAppender">
    <param name="File" value="app.log" />
    <param name="Append" value="true" />
    <param name="MaxFileSize" value="10MB" />
    <param name="MaxBackupIndex" value="3" />
    <layout class="org.apache.log4j.PatternLayout">
      <param name="ConversionPattern" value="%-5p %d [%t] %c: %m%n" />
    </layout>
  </appender>
  
  <appender name="SYSLOG" class="org.apache.log4j.net.SyslogAppender">
    <param name="SyslogHost" value="localhost" />
    <param name="Facility" value="local0"/>
    <layout class="org.apache.log4j.PatternLayout">
      <param name="ConversionPattern" value="%-5p [%t] %c: %m%n" />
    </layout>
  </appender>
  
  <root>
    <level value="INFO" />
    <appender-ref ref="SYSLOG"/>
  </root>

</log4j:configuration>