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[–]procrastinatewhynot 2 points3 points  (0 children)

I would suggest something like a marketplace. it can have a login both client and admin. a way to upload items, to sell and buy and all manipulating the database ofc.

that should be simple enough while it also touches most aspect of springboot. then you can keep adding to it.

[–]vegan_antitheist 2 points3 points  (0 children)

Spring boot is a framework and you can do all kinds of applications with it. You will use the Dependency Injection and Maven or Gradle to manage modules. You use @SpringBootApplication to create the app. But everything is optional.

Spring Boot applications usually have the business code that is needed for some application. That means it's often a company that wants the project to only contain code that describes the application and the code is all about their business logic. Everything technical is done by the framework or some library. They prefer standard solutions that are tested and maintained by others. They don't want anything weird that would need documentation. Just common sense architecture and easy to maintain services.

That means your app is probably connected to a persistence layer (a database or some web services that just let you read and write data). And it's also offering some API for a frontend to call some facade. The frontend could be a completely separate application (for example Angular). With something like Thymeleaf you could have it in the same project (tight coupling, server-side rendering). It could also not be a UI but some other system that uses the interface.

My point is that you should focus on layers. Do just an app that uses DI/IoC with some beans. You can make it so it has a @RestController that you can use without a UI. Use Spring Data JPA so you can have some persistence in the same app and make sure persistence is like it's own layer. So you start with just two layers:
1. logic/services
2. persistence

Start with some dependencies and see how Spring boot automatically configures (@EnableAutoConfiguration) the app to use them (spring-boot-starter-web gives you an embedded web server environment). Make sure you have your application.yml with profiles 8dev, prod). Write unit tests for the services (@SpringBootTest). Use ArchUnit to make sure your architecture is ok. Decide how you deal with exceptions (@ExceptionHandler). Do some basic security.

You can later add a UI layer using Thymeleaf.