Question: slf4j how to use logback?
Answer: Step 0 - Add LOGBack dependency libraries. ... 
Step 1 - Add LOGBack dependency to your Maven POM. ... 
Step 2 - Import existing (starter) XML configuration files. ... 
Step 3 - Customize the XML configuration just enough to test. ... 
Step 4 - Put logging code in your classes. ... 
Step 5 - Run your app and make sure it works.