findAll

Service

Antes

@Transactional(readOnly = true)
public List<UserDTO> findAll() {
    List<UserDTO> result = repository.findAll().stream().map(x -> new UserDTO(x)).toList();
    return result;
}

Depois

public Flux<UserDTO> findAll() {
    return repository.findAll().map(UserDTO::new);
}

Controller

Antes

@GetMapping
public ResponseEntity<List<UserDTO>> findAll() {
    List<UserDTO> list = service.findAll();
    return ResponseEntity.ok().body(list);
}

Depois

@GetMapping
public Flux<UserDTO> findAll() {
    return service.findAll();
}