Have you had experience applying DDD principles in your projects?

Yes, I have applied the principles of Domain-Driven Design (DDD) in my Java projects. The main idea of DDD is to focus on business logic and domain modeling rather than technical details. In my projects, I identified domain models, aggregates, repositories, and services to clearly separate responsibilities and ensure a clean architecture.

For example, in a project for order management, I created an 'Order' aggregate that encapsulated all business rules related to orders, and a repository responsible for saving and loading these aggregates from the database. This approach made it easy to maintain and extend the system without mixing business logic with infrastructure code.