Couchbase Java SDK 2.0: Setup of Log4j to TRACE the SDK output into a file, DEBUG into console

log4j.xml

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

  <!-- A time/date based rolling appender for couchbase -->
  <appender name="CB" class="org.apache.log4j.RollingFileAppender">
    <errorHandler class="org.apache.log4j.helpers.OnlyOnceErrorHandler"/>
    <param name="File" value="log/couchbase.log"/>

    <param name="Append" value="true"/>
    <param name="MaxFileSize" value="20MB"/>
    <param name="MaxBackupIndex" value="50"/>

    <layout class="org.apache.log4j.PatternLayout">
      <!-- Hours Priority [Class] Message\n -->
      <param name="ConversionPattern" value="%d{HH:mm:ss,SSS} %-5p [%C{2}] %m%n"/>
    </layout>
  </appender>

  <!-- Console Appender for Couchbase SDK classes, the level is prefixed by a [CB] -->
  <appender name="CBCONSOLE" class="org.apache.log4j.ConsoleAppender">
    <layout class="org.apache.log4j.PatternLayout">
      <param name="ConversionPattern" value="%d{HH:mm:ss,SSS} [CB] %-5p [%C{2}] %m%n"/>
    </layout>
  </appender>

  <!-- Console Appender for default logging, the level has spaces where the couchbase one has [CB] -->
  <appender name="CONSOLE" class="org.apache.log4j.ConsoleAppender">
    <layout class="org.apache.log4j.PatternLayout">
      <param name="ConversionPattern" value="%d{HH:mm:ss,SSS}      %-5p [%c] %m%n"/>
    </layout>
  </appender>

  <!-- Activate tracing for couchbase namespace into the file only -->
  <logger name="com.couchbase.client" additivity="false">
    <level value="TRACE"/>
    <appender-ref ref="CB"/>
  </logger>

  <!-- Debug log into console, don't let it go into "normal" console -->
  <logger name="com.couchbase.client" additivity="false">
    <level value="DEBUG"/>
    <appender-ref ref="CBCONSOLE"/>
  </logger>

  <!-- ======================================================== -->
  <!-- Maybe copy your other appenders, root configuration here -->
  <!-- ======================================================== -->

  <root>
    <appender-ref ref="CONSOLE"/>
  </root>


</log4j:configuration>