If you want to use slf4j simple, you need these jar files on your classpath:
- slf4j-api-1.6.1.jar
- slf4j-simple-1.6.1.jar
If you want to use slf4j and log4j, you need these jar files on your classpath:
- slf4j-api-1.6.1.jar
- slf4j-log4j12-1.6.1.jar
- log4j-1.2.16.jar
No more, no less. Using slf4j simple, you’ll get basic logging to your console at INFO level or higher. Using log4j, you must configure it accordingly.