Error with generic type

[digows]

Hello,

I have these Dart class:

@jsonSerializable
class PageImpl<T>
{
  List<T>? content;
  PageRequest? pageable;
  bool? empty;
  bool? first;
  bool? last;
  int? number;
  int? numberOfElements;
  int? size;
  Sort? sort;
  int? totalElements;
  int? totalPages;
}

@jsonSerializable
class Advertising extends AbstractEntity
{
  String? title;
  double? price;
  int? quantity;
  String? description;
  AdvertisingCondition? condition;
  AdvertisingStatus? status;
  List<String>? images;
  List<String>? sourceImages;
  String? sourceId;
  String? sourceUrl;
  Store? store;
  Product? product;
}

When I try to deserialize this sample json:

{
   "content":[
      {
         "id":25438,
         "created":"2024-07-04T18:46:31.048683Z",
         "updated":"2024-07-04T20:45:00.030320Z",
         "title":"SCOOTER HOVERBOARD BATERIA"
      }
   ],
   "last":false,
   "totalPages":23962,
   "totalElements":23962,
   "first":true,
   "size":1,
   "number":0,
   "numberOfElements":1,
   "empty":false
}

via:

JsonMapper.deserialize<PageImpl<Advertising>>(json)

I got this error:

[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: type 'List<dynamic>' is not a subtype of type 'Map<dynamic, dynamic>'
#0      JsonMapper._deserializeObject (package:dart_json_mapper/src/mapper.dart:954:9)
#1      JsonMapper._deserializeObject.<anonymous closure> (package:dart_json_mapper/src/mapper.dart:1035:13)
#2      JsonMapper._enumeratePublicProperties (package:dart_json_mapper/src/mapper.dart:593:14)
#3      JsonMapper._deserializeObject (package:dart_json_mapper/src/mapper.dart:1000:5)
#4      JsonMapper.deserialize (package:dart_json_mapper/src/mapper.dart:53:21)

The issue is related to PageImpl.content which is generic.
Any tips on how to solve this?

Thanks