title: Flutter and Firebase: Execution failed for task ':firebase_auth:compileDebugJavaWithJavac'
body: <p>I am trying to build my flutter application to interact with firebase. I have placed my google-services.json in the right place. However whenever i try to build the Android application i get the following run log:</p>
  
  <pre><code>Running "flutter packages get" in smart_diet_flutter...          2.6s
  Launching lib\main.dart on ONEPLUS A6003 in debug mode...
  Initializing gradle...
  Resolving dependencies...
  Gradle task 'assembleDebug'...
  registerResGeneratingTask is deprecated, use registerGeneratedResFolders(FileCollection)
  registerResGeneratingTask is deprecated, use registerGeneratedResFolders(FileCollection)
  registerResGeneratingTask is deprecated, use registerGeneratedResFolders(FileCollection)
  registerResGeneratingTask is deprecated, use registerGeneratedResFolders(FileCollection)
  registerResGeneratingTask is deprecated, use registerGeneratedResFolders(FileCollection)
  C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.8.0\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java:9: error: cannot find symbol
  import androidx.annotation.NonNull;
                            ^
    symbol:   class NonNull
    location: package androidx.annotation
  C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.8.0\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java:10: error: cannot find symbol
  import androidx.annotation.Nullable;
                            ^
    symbol:   class Nullable
    location: package androidx.annotation
  C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.8.0\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java:638: error: cannot find symbol
    private void reportException(Result result, @Nullable Exception exception) {
                                                 ^
    symbol:   class Nullable
    location: class FirebaseAuthPlugin
  C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.8.0\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java:550: error: cannot find symbol
      public void onComplete(@NonNull Task&lt;AuthResult&gt; task) {
                              ^
    symbol:   class NonNull
    location: class FirebaseAuthPlugin.SignInCompleteListener
  C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.8.0\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java:569: error: cannot find symbol
      public void onComplete(@NonNull Task&lt;Void&gt; task) {
                              ^
    symbol:   class NonNull
    location: class FirebaseAuthPlugin.TaskVoidCompleteListener
  C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.8.0\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java:587: error: cannot find symbol
      public void onComplete(@NonNull Task&lt;SignInMethodQueryResult&gt; task) {
                              ^
    symbol:   class NonNull
    location: class FirebaseAuthPlugin.GetSignInMethodsCompleteListener
  C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.8.0\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java:186: error: cannot find symbol
                        public void onComplete(@NonNull Task&lt;AuthResult&gt; task) {
                                                ^
    symbol: class NonNull
  C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.8.0\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java:445: error: cannot find symbol
                public void onComplete(@NonNull Task&lt;GetTokenResult&gt; task) {
                                        ^
    symbol: class NonNull
  C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.8.0\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java:499: error: cannot find symbol
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                                            ^
    symbol: class NonNull
  Note: C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.8.0\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java uses unchecked or unsafe operations.
  Note: Recompile with -Xlint:unchecked for details.
  9 errors
  
  FAILURE: Build failed with an exception.
  
  * What went wrong:
  Execution failed for task ':firebase_auth:compileDebugJavaWithJavac'.
  &gt; Compilation failed; see the compiler error output for details.
  
  * Try:
  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
  
  * Get more help at https://help.gradle.org
  
  BUILD FAILED in 22s
  Finished with error: Gradle task assembleDebug failed with exit code 1
  </code></pre>
  
  <p>From my research I found that i might need to upgrade to AndroidX. I followed this <a href="https://developer.android.com/jetpack/androidx/migrate#migrate" rel="noreferrer">link</a> to upgrade my android. However i still got the same errors when trying to build and run the app.</p>
  
  <p>I am using InteliJ as my IDE with a flutter project and my pubspec.yaml is as follows:</p>
  
  <pre><code>name: smart_diet_flutter
  description: A new Flutter project.
  
  # The following defines the version and build number for your application.
  # A version number is three numbers separated by dots, like 1.2.43
  # followed by an optional build number separated by a +.
  # Both the version and the builder number may be overridden in flutter
  # build by specifying --build-name and --build-number, respectively.
  # Read more about versioning at semver.org.
  version: 1.0.0+1
  
  environment:
    sdk: "&gt;=2.0.0-dev.68.0 &lt;3.0.0"
  
  dependencies:
    flutter:
      sdk: flutter
  
    # The following adds the Cupertino Icons font to your application.
    # Use with the CupertinoIcons class for iOS style icons.
    cupertino_icons: ^0.1.2
    firebase_auth: 0.8.0
    firebase_database: 1.1.0+1
  
  dev_dependencies:
    flutter_test:
      sdk: flutter
  
  
  # For information on the generic Dart part of this file, see the
  # following page: https://www.dartlang.org/tools/pub/pubspec
  
  # The following section is specific to Flutter.
  flutter:
  
    # The following line ensures that the Material Icons font is
    # included with your application, so that you can use the icons in
    # the material Icons class.
    uses-material-design: true
  
    # To add assets to your application, add an assets section, like this:
    # assets:
    #  - images/a_dot_burr.jpeg
    #  - images/a_dot_ham.jpeg
  
    # An image asset can refer to one or more resolution-specific "variants", see
    # https://flutter.io/assets-and-images/#resolution-aware.
  
    # For details regarding adding assets from package dependencies, see
    # https://flutter.io/assets-and-images/#from-packages
  
    # To add custom fonts to your application, add a fonts section here,
    # in this "flutter" section. Each entry in this list should have a
    # "family" key with the font family name, and a "fonts" key with a
    # list giving the asset and other descriptors for the font. For
    # example:
    # fonts:
    #   - family: Schyler
    #     fonts:
    #       - asset: fonts/Schyler-Regular.ttf
    #       - asset: fonts/Schyler-Italic.ttf
    #         style: italic
    #   - family: Trajan Pro
    #     fonts:
    #       - asset: fonts/TrajanPro.ttf
    #       - asset: fonts/TrajanPro_Bold.ttf
    #         weight: 700
    #
    # For details regarding fonts from package dependencies,
    # see https://flutter.io/custom-fonts/#from-packages
  
  assets:
    - assets/flutter-icon.png
  </code></pre>