pekko-sample-distributed-data-java/src/test/resources/logback-test.xml

<configuration>

  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    <encoder>
      <pattern>[%date{ISO8601}] [%level] [%logger] [%marker] [%thread] - %msg%n</pattern>
    </encoder>
  </appender>

  <root level="INFO">
    <appender-ref ref="STDOUT"/>
  </root>

</configuration>