xml_serializable 2.5.4 is incompatible with source_gen ^3.1.0

[Poloten]

New libs in Flutter switching to source_gen ^3.1.0 and build 2.7.1.
Do you have any plans to release a new version ?

[tnc1997]

Hi @Poloten, thank you very much for using this package and opening this issue.

I am planning to release an updated version of xml_serializable with the new dependency constraints this week.

[tnc1997]

Hi @Poloten, could I get you to verify that the changes in the main branch resolve this issue for you?

[Poloten]

Hi @Poloten, could I get you to verify that the changes in the main branch resolve this issue for you?

Hi tnc1997 An issue has arisen with incompatible versions of analyzer, source_gen, and build. I think we could provide an example of compatible dependency sets, allowing users to choose which version combination to build with.

analyzer ^7.0.0
source_gen to ^3.0.0

analyzer ^8.0.0
source_gen ^4.0.0
build ^4.0.0

I took the example from here https://pub.dev/packages/copy_with_extension_gen/changelog

[tnc1997]

Thank you for the heads up, it is definitely something that I will consider documenting, have you been able to validate that the package works as intended?

[Poloten]

Thank you for the heads up, it is definitely something that I will consider documenting, have you been able to validate that the package works as intended?

In my case I get error:

Resolving dependencies...
Because wallet.app depends on xml_serializable from git which depends on analyzer ^8.0.0, analyzer ^8.0.0 is required.
So, because wallet.app depends on analyzer ^7.7.1, version solving failed.
Failed to update packages.

[tnc1997]

You will need to use version 8.0.0 or above of the analyzer package in order to make use of the latest changes in the xml_serializable package.

[Poloten]

You will need to use version 8.0.0 or above of the analyzer package in order to make use of the latest changes in the xml_serializable package.

Yep, but Some othe libs, like a copy_with_extension pinned versions to

analyzer ^7.0.0
source_gen to ^3.0.0

and latest to

analyzer ^8.0.0
source_gen ^4.0.0

[tnc1997]

If you need to use an older version of the analyzer package in your application then could you use the current version of this package?

[Poloten]

If you need to use an older version of the analyzer package in your application then could you use the current version of this package?

it's possible to make:

analyzer: '>=7.4.0 <9.0.0' # Allow version 8, but don't require it, yet (to use its API) for compat with more third-party packages

https://github.com/objectbox/objectbox-dart/blob/main/generator/pubspec.yaml

In other cases I get a dependency conflict if analyzer pinned to 8.0.0 version

[tnc1997]

analyzer: '>=7.4.0 <9.0.0'

The changes to the xml_serializable package require minimum version 8.0.0 due to breaking changes introduced.

[Poloten]

analyzer: '>=7.4.0 <9.0.0'

The changes to the xml_serializable package require minimum version 8.0.0 due to breaking changes introduced.

it's possible to make compatibility with analyzer: '>=7.4.0 <9.0.0' ??

[tnc1997]

it's possible to make compatibility with analyzer: '>=7.4.0 \u003C9.0.0' ??

Unfortunately not without breaking changes to the xml_serializable package due to the way that metadata is accessed in version 7.4.0 and version 8.0.0.

[Poloten]

get error when optional element exist

import 'package:mess/soap_classes/account_api/get_message_history_of_contact.dart';
import 'package:xml/xml.dart';
import 'package:xml_annotation/xml_annotation.dart' as annotation;

part 'get_last_messages_after_id.g.dart';

@annotation.XmlRootElement(name: 'GetLastMessagesAfterIdResponse')
@annotation.XmlSerializable()
class GetLastMessagesAfterIdResponse {
  @annotation.XmlElement(name: 'GetLastMessagesAfterIdResult')
  int getLastMessagesAfterIdResult;
  @annotation.XmlElement(name: 'messages')
  Messages? messages;

  GetLastMessagesAfterIdResponse({
    required this.getLastMessagesAfterIdResult,
    this.messages,
  });

  factory GetLastMessagesAfterIdResponse.fromXmlElement(XmlElement element) =>
      _$GetLastMessagesAfterIdResponseFromXmlElement(element);

  void buildXmlChildren(
    XmlBuilder builder, {
    Map<String, String> namespaces = const {},
  }) =>
      _$GetLastMessagesAfterIdResponseBuildXmlChildren(
        this,
        builder,
        namespaces: namespaces,
      );

  void buildXmlElement(
    XmlBuilder builder, {
    Map<String, String> namespaces = const {},
  }) =>
      _$GetLastMessagesAfterIdResponseBuildXmlElement(
        this,
        builder,
        namespaces: namespaces,
      );

  List<XmlAttribute> toXmlAttributes({
    Map<String, String?> namespaces = const {},
  }) =>
      _$GetLastMessagesAfterIdResponseToXmlAttributes(
        this,
        namespaces: namespaces,
      );

  List<XmlNode> toXmlChildren({
    Map<String, String?> namespaces = const {},
  }) =>
      _$GetLastMessagesAfterIdResponseToXmlChildren(
        this,
        namespaces: namespaces,
      );

  XmlElement toXmlElement({
    Map<String, String?> namespaces = const {},
  }) =>
      _$GetLastMessagesAfterIdResponseToXmlElement(
        this,
        namespaces: namespaces,
      );
}

 Null check operator used on a null value
  #0      XmlSerializableGenerator._xmlSerializableSerializerGeneratorFactory (package:xml_serializable/src/xml_serializable_generator.dart:381:33)
  #1      XmlSerializableGenerator._xmlSerializableSerializerGeneratorFactory (package:xml_serializable/src/xml_serializable_generator.dart:402:11)
  #2      XmlSerializableGenerator._generateBuildXmlChildren (package:xml_serializable/src/xml_serializable_generator.dart:124:48)
  #3      XmlSerializableGenerator.generateForAnnotatedElement (package:xml_serializable/src/xml_serializable_generator.dart:53:7)
  #4      GeneratorForAnnotation.generate (package:source_gen/src/generator_for_annotation.dart:98:30)
  #5      _generate (package:source_gen/src/builder.dart:373:33)
  <asynchronous suspension>
  #6      Stream.toList.<anonymous closure> (dart:async/stream.dart:1416:7)
  <asynchronous suspension>
  #7      _Builder._generateForLibrary (package:source_gen/src/builder.dart:118:9)
  <asynchronous suspension>
  #8      _Builder.build (package:source_gen/src/builder.dart:109:5)
  <asynchronous suspension>
  #9      runBuilder.buildForInput (package:build_runner_core/src/generate/run_builder.dart:91:7)
  <asynchronous suspension>
  #10     Future.wait.<anonymous closure> (dart:async/future.dart:525:21)
  <asynchronous suspension>
  #11     BuildLogLogger.scopeLogAsync.<anonymous closure> (package:build_runner_core/src/logging/build_log_logger.dart:58:13)
  <asynchronous suspension>

[tnc1997]

Thank you for testing and reporting that error, I will aim to investigate it over the next couple of weeks.