Springboot |成功响应时，请在请求时使无效响应主体

Question

像这样的Springboot项目中返回响应：

@GetMapping("/users")
public ResponseEntity<List<UserDto>> getUsers() {
    return ResponseEntity.ok(adminService.getUsers());
}

AdminService方法：

@Override
public List<UserDto> getUsers() {
    return userRepo.findAll()
            .stream()
            .map(this::convertEntityToDto)
            .collect(Collectors.toList());
}

我正在获取用户，但是在这样的成功主体之后，Null

[
{
    "id": 7,
    "title": "title",
    "description": "describtion",
    "email": "[email protected]",
    "creationDate": "2022-04-21T12:17:40.000+00:00",
    "plannedFinishDate": "2022-04-21T12:17:40.000+00:00"
},
{
    "id": 8,
    "title": "title2",
    "description": "describtion2",
    "email": "[email protected]",
    "creationDate": "2022-04-21T12:17:40.000+00:00",
    "plannedFinishDate": "2022-04-21T12:17:40.000+00:00"
}
]null

没有邮递员（在Alamofire的iOS Project中）尝试了此操作，但仍在这里。