logback.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
  <jmxConfigurator/>
  <appender name="CONSOLE_ERR" class="ch.qos.logback.core.ConsoleAppender">
    <target>System.err</target>
    <encoder class="org.spf4j.log.ReadableLogbackEncoder"/>
    <!-- you want JSON, use this: <encoder class="org.spf4j.log.AvroLogbackEncoder"/> -->
    <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
      <level>error</level>
    </filter>
  </appender>
  <appender name="CONSOLE_OUT" class="ch.qos.logback.core.ConsoleAppender">
    <target>System.out</target>
    <encoder class="org.spf4j.log.ReadableLogbackEncoder"/>
    <!-- you want JSON, use this: <encoder class="org.spf4j.log.AvroLogbackEncoder"/> -->
    <filter class="org.spf4j.log.UpToThresholdFilter">
      <level>warn</level>
    </filter>
  </appender>
  <logger name="org.spf4j" level="info" additivity="false">
    <appender-ref ref="CONSOLE_ERR" />
    <appender-ref ref="CONSOLE_OUT" />
  </logger>
  <root level="warn">
    <appender-ref ref="CONSOLE_ERR" />
    <appender-ref ref="CONSOLE_OUT" />    
  </root>
</configuration>