src/examples/cpp/custom-appender.xml

<?xml version="1.0" encoding="UTF-8" ?>
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
  <appender name="ConsoleAppender" class="org.apache.log4j.ConsoleAppender">
    <param name="Target" value="System.out"/>
    <layout class="org.apache.log4j.PatternLayout">
      <param name="ConversionPattern" value="[%d{yyyy-MM-dd HH:mm:ss}] %c %-5p - %m%n"/>
    </layout>
  </appender>

  <appender name="NullAppender" class="NullWriterAppender">
    <param name="SomeValue" value="Nothing"/>
  </appender>

  <root>
     <priority value="info" />
     <appender-ref ref="ConsoleAppender"/>
  </root>

  <logger name="NullLogger" additivity="false">
     <appender-ref ref="NullAppender"/>
  </logger>
</log4j:configuration>