@RestController: Spring’s annotation to signal that this class doesn’t process templates but instead that all outputs are directly serialized to the HTML response

EmployeeRepository: We are injecting the repository we defined earlier in this section through constructor injection

@GetMapping: Maps HTTP GET /api/employees calls to this method

Flux: Indicates that this returns one (or more) Employee records

repository.findAll(): By using the prebuilt findAll method from Spring Data Commons’ ReactiveCrudRepository interface, we already have a method that will fetch all the data

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@RestController

public class ApiController {

  private final EmployeeRepository repository;

  public ApiController(EmployeeRepository repository) {

    this.repository = repository;

  }

}

   @GetMapping("/api/employees")

    Flux<Employee> employees() {

      return repository.findAll();

    }