Spring boot - Cannot turn off logging

Add the following to the the package of your choice.

logging.level.<package>=OFF

logging.level.root=OFF doesn´t work for me

To answer my own question: after trial and error, I finally ended up with the following which suppresses all output on startup via the application.properties file:

 logging.level.root=OFF
 logging.level.org.springframework.boot=OFF
 spring.main.banner-mode=OFF