Twelve chapters in, this project has a domain model, a persistence layer, a service layer, an exception handler and something close to a hundred tests, and yet there is no entry point to fire up everything. There is nothing to start. No main method, no application context, no datasource.
Source: [Dev.to](https://dev.to/kamenivanov/bootstrapping-the-system-part-1-nothing-is-a-bean-yet-chapter-13-2l4o)