Arquivo de configuração simples de exemplo do logback com ativação do JMX.

logback.xml

<?xml version="1.0" encoding="UTF-8" ?>

<configuration scan="true" scanPeriod="3 seconds">
  <jmxConfigurator />

  <statusListener class=
      	"ch.qos.logback.core.status.OnConsoleStatusListener"/>

  <appender name="STDOUT"
            class="ch.qos.logback.core.ConsoleAppender">
    <layout class="ch.qos.logback.classic.PatternLayout">
      <pattern>
        %d{HH:mm:ss.SSS} %-5level %logger{16} - %msg%n
      </pattern>
    </layout>
  </appender>

  <root>
    <level value="DEBUG"/>
    <appender-ref ref="STDOUT"/>
  </root>

</configuration>