Architecting Modern Java EE Applications

Flat module package

An even simpler and more straightforward approach to organize module contents is to directly put all related classes into this module package in a flat hierarchy. For the users package this means to place all classes, including user related use case entry points, user database access code, potential external system functionality, and the user entity classes themselves, directly into this package.

Depending on the complexity of the modules this can be a clean and straightforward approach or it can become too unorganized over time. Especially entities, value objects, and transfer objects can reach a number of classes that, if put into a single package, drastically reduce clarity and overview. However, it makes a lot of sense ...