conf/logback.xml

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

<configuration scan="true" scanPeriod="30 seconds">
  <appender name="A1" class="ch.qos.logback.core.ConsoleAppender">
    <encoder>
      <pattern>%-4r [%t] %-5p %c - %m%n</pattern>
    </encoder>
  </appender>
  <logger name="org.apache.zookeeper" level="WARN"/>
  <root level="INFO">
    <appender-ref ref="A1"/>
  </root>
</configuration>