Reputation: 2098

flutter pub run build_runner build failed

flutter version:

flutter_macos_v1.9.1+hotfix.2-stable

create new project in terminal:

flutter create myapp

open vscode, edit pubspec.yaml:

dependencies:
  json_annotation: ^3.0.0

dev_dependencies:
  build_runner: ^1.7.0
  json_serializable: ^3.2.2

get packages in terminal:

flutter pub get

new /lib/user.dart and filling below:

import 'package:json_annotation/json_annotation.dart';

part 'user.g.dart';

@JsonSerializable()
class User extends Object {
  @JsonKey(name: 'seed')
  String seed;

  @JsonKey(name: 'results')
  int results;

  @JsonKey(name: 'page')
  int page;

  @JsonKey(name: 'version')
  String version;

  User(
    this.seed,
    this.results,
    this.page,
    this.version,
  );

  factory User.fromJson(Map<String, dynamic> srcJson) =>
      _$UserFromJson(srcJson);

  Map<String, dynamic> toJson() => _$UserToJson(this);
}

run flutter pub run build_runner build in terminal:

[INFO] Generating build script...
[INFO] Generating build script completed, took 321ms

[INFO] Creating build script snapshot......
[INFO] Creating build script snapshot... completed, took 10.4s

[INFO] Initializing inputs
[INFO] Building new asset graph...
[INFO] Building new asset graph completed, took 698ms

[INFO] Checking for unexpected pre-existing outputs....
[INFO] Checking for unexpected pre-existing outputs. completed, took 2ms

[INFO] Running build...
[SEVERE] json_serializable:json_serializable on lib/user.dart:

Invalid argument(s): Path must be absolute : dart:core
[SEVERE] json_serializable:json_serializable on lib/main.dart:

Invalid argument(s): Path must be absolute : dart:core
[SEVERE] json_serializable:json_serializable on test/widget_test.dart:

Invalid argument(s): Path must be absolute : dart:core
[INFO] Running build completed, took 1.5s

[INFO] Caching finalized dependency graph...
[INFO] Caching finalized dependency graph completed, took 36ms

[SEVERE] Failed after 1.6s

why never succeeded?!

Upvotes: 61

Answers (25)

Amarchand K

Reputation: 5

this is the new command - dart run build_runner build --delete-conflicting-outputs

Upvotes: 0

sanal parakkal

Reputation: 71

dart run build_runner build --delete-conflicting-outputs

Upvotes: 5

Momen Mahmoud

Reputation: 1

this proplem happens with me , if you have analyzer: package try to remove it and make : 1- flutter clean 2- delete pubspec.lock 3- flutter pub get 4- flutter pub run build_runner clean it will work 100% after doing that you can adding you analyzer again and make flutter pub get

Upvotes: 0

krrskl

Reputation: 121

In my case, when using flutter 3.22.2, the problem was due to overwriting a version of the meta package.

Upvotes: 0

Og'abek Norpulatov

Reputation: 1

dependencies:

retrofit: '>=4.0.0 <5.0.0'

logger: any #for logging purpose

json_annotation: ^4.8.1

dev_dependencies:

retrofit_generator: '>=7.0.0 <8.0.0' // required dart >=2.19

build_runner: '>=2.3.0 <4.0.0'

json_serializable: ^6.6.2

Upvotes: 0

Golnar sheikh bahaie

Reputation: 202

add hive_generator
flutter pub get 
flutter packages pub run build_runner build

Upvotes: 0

Siewe Rostand

Reputation: 41

I had the same error while running flutter pub run build_runner build --delete-conflicting-outputs but it was showing this error

Failed to build build_runner:build_runner:
../../../.pub-cache/hosted/pub.dev/watcher-1.0.2/lib/src/constructable_file_system_event.dart:7:57: Error: The class 'FileSystemEvent' can't be extended, implemented, or mixed in outside of its library because it's a sealed class.

After trying everything here without success, I simply did a flutter pub get and everything works well after when I did flutter pub run build_runner build --delete-conflicting-outputs

Upvotes: 0

Mr B

Reputation: 109

make sure the class name is same with the generated file name. For ex:

part 'User.g.dart';

class User {

}

Upvotes: 0

Maharun Afroz

Reputation: 116

First make sure to maintain small letter and underscore style here:

part 'course_box.g.dart';

Then, run this:

dart pub run build_runner build --delete-conflicting-outputs

It worked for me.

Upvotes: 1

Imad Bouirmane

Reputation: 31

In my side I edited the build_runner_core-version package source code outside my flutter project with adding a method to the class BuildForInputLogger in the following code below:

Stream<Level?> get onLevelChanged {

return Stream.empty(); }

And yeah it's worked to me

Upvotes: 0

merterkoc

Reputation: 11

This is working you should definitely try it

I was getting the message "Success after 1.0 seconds with 0 output (0 actions)" when I used it with dart frog. He needed to create a "bin" file and put the factories in it so he could see it. This worked for me!

Image of Code

Upvotes: 1

Cyber

Reputation: 2704

Looks like flutter clean is resolving the issue. Try running it before i.e. openApi Generator.

Upvotes: 0

tazboy

Reputation: 1754

My class name was:

class Game

but my filename was game_model.dart So you'll need to use:

part 'game_model.g.dart';

You may also need to add hive_generator dependency.

Upvotes: 0

mostafa sami

Reputation: 52

you may need hive_generator in your dependencies

Upvotes: 1

samin

Reputation: 522

I had the same error. I simply installed the build runner package in pubspec.yaml file like -

dev_dependencies:

build_runner: ^1.3.1

mobx_codegen: ^0.3.9

Upvotes: 1

Suhad Bin Zubair

Reputation: 804

Please create default empty constructor for models class before flutter packages pub run build_runner build command

Upvotes: 8

Supun Sandaruwan

Reputation: 2418

I tried with many solutions, But error not gone. flutter packages pub run build_runner watch command ran with endless log.

I deleted pubspec.lock and ran flutter pub get and installed dependency again and ran above command. After this error gone.

Upvotes: 31

Jiten Basnet

Reputation: 1820

Update 2020/8/24: seems to break build_runner or json_serializable in version:

Analyzer: 0.39.16

Going back to dart analyzer version:

Analyzer: 0.39.14

fixed it for me. So, something is broken in 0.39.16.

Upvotes: 0

yulkin

Reputation: 41

I got this to work with the latest build_runner and json_serializable versions after a long process of trying all of the above suggestions: build_runner: ^1.10.2 json_serializable: ^3.4.0 Not sure what ultimately worked, but looks like one of the issues in my case was a slightly outdated dart SDK, so that's one more thing to keep an eye on

Upvotes: 4

Noorus Khan

Reputation: 1476

add dependency in pubsec.yaml, analyzer: '0.39.14'

flutter clean
flutter pub cache repair
flutter pub run build_runner clean

Then run,

flutter pub run build_runner build

Upvotes: 53

VasilKanev

Reputation: 1562

Try this.

flutter pub get && flutter pub run build_runner build --delete-conflicting-outputs

Upvotes: 115

Augusto Castro Vera

Reputation: 81

I had the same issue, so I just saved the changes first in the class (in your case User class).
And then I just retried using:

flutter pub run build_runner build

Upvotes: 8

Andy

Reputation: 753

It might not be the case in this situation, but I had a similar problem caused by my auto formatter removing this line:

part 'my_class.g.dart';

Once I added that line and ran the command again it worked fine.

Upvotes: 3

Reda Lazri

Reputation: 131

Looks like Analyzer is breaking it, downgrading to analyzer: 0.38.2 solved it for me.

Source: https://github.com/dart-lang/sdk/issues/38499#issuecomment-533812652

Upvotes: 2

Karthikc

Reputation: 31

I had the same issue.

Successfully generating all *.g.dart files with:

build_runner 0.9.2

json_serializable 0.5.8+1

json_annotation 0.2.9+1

Upvotes: 2

flutter pub run build_runner build failed

Answers (25)

Successfully generating all *.g.dart files with:

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