From SLF4J manual:
> SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
> SLF4J: Defaulting to no-operation (NOP) logger implementation SLF4J:
> See http://www.slf4j.org/codes.html#StaticLoggerBinder for further
> details.
This warning is printed because no slf4j binding could be found on your class path. The warning will disappear as soon as you add a binding to your class path. Assuming you add slf4j-simple-1.7.2.jar so that your class path contains: slf4j-api-1.7.2.jar slf4j-simple-1.7.2.jar ...