Since we are still using Spring Boot, the build file does not need any modification; we will use the same file as in the last chapter. The package structure, however, is a bit different. This time, we do something more complicated than getting a request and responding to whatever the backend services deliver to us. Now, we have to implement complex business logic that, as we will see, needs many classes. When we have more than 10 classes, give or take, in a certain package, it is time to think about putting them into separate packages. The classes that are related to each other and have a similar functionality should be put into one package. This way, we will have a package for the following:
- The controllers (though we have only one in this example, but usually there are more)
- Data storing beans that have no functionality other than storing data, hence...