For Spring Boot users who is sometimes as tired of verbose logging output, especially when running tests, as I am. It is a working way to turn off loggigng messages (completely or filter them to some less verbose level, e.g. ERROR).

How-to-turn-off-SpringBoot-logging.txt

resources/application.yml:

spring:
  main:
    banner-mode: off
logging:
  level:
    root: error # or "off" for permanent silence
    
resources/logback.xml:

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <logger name="org.springframework" level="ERROR"/> <!--or "OFF" as in file above-->
</configuration>
<!--Name file as "logback-test.xml" if using in test package-->