How do I turn off the “NioEndPoint” Logging in Spring Boot?

[Bulldog13]

I am working on a Spring Boot web application where I add a long running process to a ScheduledExecutorService.

To make sure it is acting the way I think I am using System.out.println() for debugging that long running process.

My problem is I keep getting these

NioEndpoint FINER | timeout completed: keys processed=1; now=1492721057929; nextExpiration=1492721057927; keyCount=0; hasEvents=false; eval=false {timeout() / 18} 04:44.714 NioEndpoint FINER | timeout completed: keys processed=0; now=1492721058713; nextExpiration=1492721058712; keyCount=0; hasEvents=false; eval=false {timeout() / 17} 04:44.931 NioEndpoint FINER | timeout completed: keys processed=1; now=1492721058931; nextExpiration=1492721058929; keyCount=0; hasEvents=false; eval=false {timeout() / 18} 04:44.718 NioEndpoint FINER | timeout completed

Messages spammed in the output window, which makes deciphering the other logging impossible.

I tried adding logging.level.root=ERROR to application.properties, but that did not remove them.

How do I get them not to appear...and what do they signify ?