Add logger to your project

Add dependency for logger (in maven) on your system. Logger will help you to see how your application is working and catch some unexpected behaviour from logs.

Hint: You can use slf4j logger (https://mvnrepository.com/artifact/org.slf4j).
For logging with slf4j you should use (as minimum) next artifacts (names of libs): "slf4j-api" and "slf4j-simple". The first one is a core of logger library and the second one is an implementation of logger.

Also hint: to find some external libraries you can google it something like: "%name_of_lib maven"