What methods are used to implement interaction between individual microservices?

In the architecture of a Spring application, the repository is responsible for interacting with the database or other data sources. It encapsulates data access logic, providing a convenient interface for CRUD operations (create, read, update, delete). This helps separate business logic from storage details, improving modularity and testability.

In Spring, the repository pattern is often used together with Spring Data, where repository interfaces are automatically implemented by the framework.

Example of a repository interface for a User entity:

public interface UserRepository extends JpaRepository<User, Long> {
    List<User> findByLastName(String lastName);
}

Thus, the repository simplifies data handling and promotes a clean architecture.