Insert

Service

public DepartmentDTO insert(DepartmentDTO dto) {
    Department department = new Department();

    department.setId(UUID.randomUUID());
    department.setName(dto.getName());

    departmentRepository.save(department);
    return new DepartmentDTO(department);
}

Controller

@PostMapping
public ResponseEntity<DepartmentDTO> insert(@RequestBody DepartmentDTO dto) {
    dto = departmentService.insert(dto);

    URI uri = URI.create("/departments/" + dto.getId());
    return ResponseEntity.created(uri).body(dto);
}