如何解决Flutter“正在运行 Gradle 任务 ''assembleDebug''...”（启动 Gradle 守护进程）永远不会结束 日志：？

当我运行 Flutter run -v 时。

预期结果： 组装调试过程结束，应用程序在 Flutter run

实际结果：

卡在Running Gradle task ''assembleDebug''...上 和 Starting a Gradle Daemon,"N (ANY NUMBER)" busy Daemons Could not be reused,use --status for details 并且运行过程永无止境！

日志：

Flutter run -v

[  +56 ms] executing: [C:\src\Flutter/] git -c log.showSignature=false log -n 1 --pretty=format:%H
[ +185 ms] Exit code 0 from: git -c log.showSignature=false log -n 1 --pretty=format:%H
[   +1 ms] f4abaa0735eba4dfd8f33f73363911d63931fe03
[        ] executing: [C:\src\Flutter/] git tag --points-at f4abaa0735eba4dfd8f33f73363911d63931fe03
[  +47 ms] Exit code 0 from: git tag --points-at f4abaa0735eba4dfd8f33f73363911d63931fe03
[        ] 2.2.3
[   +5 ms] executing: [C:\src\Flutter/] git rev-parse --abbrev-ref --symbolic @{u}
[  +35 ms] Exit code 0 from: git rev-parse --abbrev-ref --symbolic @{u}
[        ] origin/stable
[        ] executing: [C:\src\Flutter/] git ls-remote --get-url origin
[  +31 ms] Exit code 0 from: git ls-remote --get-url origin
[        ] https://github.com/Flutter/Flutter.git
[  +95 ms] executing: [C:\src\Flutter/] git rev-parse --abbrev-ref HEAD
[  +35 ms] Exit code 0 from: git rev-parse --abbrev-ref HEAD
[        ] stable
[  +54 ms] Artifact Instance of ''AndroidGenSnapshotArtifacts'' is not required,skipping update.
[        ] Artifact Instance of ''AndroidInternalBuildArtifacts'' is not required,skipping update.
[        ] Artifact Instance of ''IOSEngineArtifacts'' is not required,skipping update.
[        ] Artifact Instance of ''FlutterWebSdk'' is not required,skipping update.
[   +2 ms] Artifact Instance of ''WindowsEngineArtifacts'' is not required,skipping update.
[        ] Artifact Instance of ''MacOSEngineArtifacts'' is not required,skipping update.
[        ] Artifact Instance of ''LinuxEngineArtifacts'' is not required,skipping update.
[        ] Artifact Instance of ''LinuxFuchsiaSDKArtifacts'' is not required,skipping update.
[        ] Artifact Instance of ''MacOSFuchsiaSDKArtifacts'' is not required,skipping update.
[        ] Artifact Instance of ''FlutterRunnerSDKArtifacts'' is not required,skipping update.
[        ] Artifact Instance of ''FlutterRunnerDebugSymbols'' is not required,skipping update.
[  +42 ms] executing: C:\Users\Raven\AppData\Local\Android\sdk\platform-tools\adb.exe devices -l
[  +37 ms] List of devices attached
           emulator-5554          device product:sdk_gphone_x86_arm model:sdk_gphone_x86_arm device:generic_x86_arm transport_id:1
[   +4 ms] C:\Users\Raven\AppData\Local\Android\sdk\platform-tools\adb.exe -s emulator-5554 shell getprop
[  +38 ms] Artifact Instance of ''AndroidInternalBuildArtifacts'' is not required,skipping update.
[   +1 ms] Artifact Instance of ''WindowsEngineArtifacts'' is not required,skipping update.
[  +65 ms] Skipping pub get: version match.
[  +77 ms] Generating C:\Users\Raven\AndroidStudioProjects\testapp\android\app\src\main\java\io\Flutter\plugins\GeneratedpluginRegistrant.java
[  +37 ms] ro.hardware = ranchu
[   +9 ms] Using hardware rendering with device sdk gphone x86 arm. If you notice graphics artifacts,consider enabling software rendering with "--enable-software-rendering".
[  +18 ms] Initializing file store
[   +8 ms] Skipping target: gen_localizations
[   +5 ms] complete
[   +3 ms] Launching lib\main.dart on sdk gphone x86 arm in debug mode...
[   +3 ms] C:\src\Flutter\bin\cache\dart-sdk\bin\dart.exe --disable-dart-dev C:\src\Flutter\bin\cache\artifacts\engine\windows-x64\frontend_server.dart.snapshot --sdk-root
C:\src\Flutter\bin\cache\artifacts\engine\common\Flutter_patched_sdk/ --incremental --target=Flutter --debugger-module-names --experimental-emit-debug-Metadata -DFlutteR_WEB_AUTO_DETECT=true --output-dill
C:\Users\Raven\AppData\Local\Temp\Flutter_tools.9d1246b8\Flutter_tool.faedfc72\app.dill --packages C:\Users\Raven\AndroidStudioProjects\testapp\.dart_tool\package_config.json -Ddart.vm.profile=false -Ddart.vm.product=false
--enable-asserts --track-widget-creation --filesystem-scheme org-dartlang-root --initialize-from-dill build\3c113a45063dc6628e68a4111abcacad.cache.dill.track.dill --enable-experiment=alternative-invalidation-strategy
[  +12 ms] executing: C:\Users\Raven\AppData\Local\Android\sdk\platform-tools\adb.exe -s emulator-5554 shell -x logcat -v time -t 1
[   +5 ms] <- compile package:testapp/main.dart
[  +34 ms] --------- beginning of main
           07-22 21:52:26.801 W/Binder:217_2(  217): type=1400 audit(0.0:151): avc: denied { read } for name="wakeup35" dev="sysfs" ino=19023 scontext=u:r:system_suspend:s0 tcontext=u:object_r:sysfs:s0 tclass=dir permissive=0
[   +8 ms] executing: C:\Users\Raven\AppData\Local\Android\sdk\platform-tools\adb.exe version
[  +28 ms] Android Debug Bridge version 1.0.41
           Version 30.0.5-6877874
           Installed as C:\Users\Raven\AppData\Local\Android\sdk\platform-tools\adb.exe
[   +1 ms] executing: C:\Users\Raven\AppData\Local\Android\sdk\platform-tools\adb.exe start-server
[  +24 ms] Building APK
[  +13 ms] Running Gradle task ''assembleDebug''...
[   +5 ms] Using gradle from C:\Users\Raven\AndroidStudioProjects\testapp\android\gradlew.bat.
[  +10 ms] executing: C:\Program Files\Android\Android Studio\jre\bin\java -version
[ +105 ms] Exit code 0 from: C:\Program Files\Android\Android Studio\jre\bin\java -version
[        ] openjdk version "11.0.8" 2020-07-14
           OpenJDK Runtime Environment (build 11.0.8+10-b944.6842174)
           OpenJDK 64-Bit Server VM (build 11.0.8+10-b944.6842174,mixed mode)
[   +1 ms] executing: [C:\Users\Raven\AndroidStudioProjects\testapp\android/] C:\Users\Raven\AndroidStudioProjects\testapp\android\gradlew.bat -Pverbose=true -Ptarget-platform=android-x86
-Ptarget=C:\Users\Raven\AndroidStudioProjects\testapp\lib\main.dart -Pdart-defines=RkxVVFRFUl9XRUJfQVVUT19ERVRFQ1Q9dHJ1ZQ== -Pdart-obfuscation=false -Ptrack-widget-creation=true -Ptree-shake-icons=false
-Pfilesystem-scheme=org-dartlang-root assembleDebug
[+3365 ms] Starting a Gradle Daemon,129 busy Daemons Could not be reused,use --status for details
[+3591 ms] Starting a Gradle Daemon,130 busy Daemons Could not be reused,use --status for details
[+3499 ms] Starting a Gradle Daemon,131 busy Daemons Could not be reused,use --status for details
[+3500 ms] Starting a Gradle Daemon,132 busy Daemons Could not be reused,133 busy Daemons Could not be reused,134 busy Daemons Could not be reused,135 busy Daemons Could not be reused,use --status for details
[+3498 ms] Starting a Gradle Daemon,136 busy Daemons Could not be reused,137 busy Daemons Could not be reused,138 busy Daemons Could not be reused,139 busy Daemons Could not be reused,140 busy Daemons Could not be reused,use --status for details
Terminate batch job (Y/N)? Y

Flutter analyze

Analyzing testapp...
No issues found! (ran in 1.0s)

Flutter doctor -v

[√] Flutter (Channel stable,2.2.3,on Microsoft Windows [Version 10.0.18363.778],locale en-US)
    • Flutter version 2.2.3 at C:\src\Flutter
    • Framework revision f4abaa0735 (3 weeks ago),2021-07-01 12:46:11 -0700
    • Engine revision 241c87ad80
    • Dart version 2.13.4

[!] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
    • Android SDK at C:\Users\Raven\AppData\Local\Android\sdk
    • Platform android-30,build-tools 30.0.2
    • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6842174)
    X Android license status unkNown.
      Run `Flutter doctor --android-licenses` to accept the SDK licenses.
      See https://Flutter.dev/docs/get-started/install/windows#android-setup for more details.

[√] Chrome - develop for the web
    • Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe

[√] Android Studio (version 4.1.0)
    • Android Studio at C:\Program Files\Android\Android Studio
    • Flutter plugin can be installed from:
       https://plugins.jetbrains.com/plugin/9212-Flutter
    • Dart plugin can be installed from:
       https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6842174)

[√] VS Code (version 1.58.2)
    • VS Code at C:\Users\Raven\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension version 3.24.0

[√] Connected device (3 available)
    • sdk gphone x86 arm (mobile) • emulator-5554 • android-x86    • Android 11 (API 30) (emulator)
    • Chrome (web)                • chrome        • web-javascript • Google Chrome 91.0.4472.164
    • Edge (web)                  • edge          • web-javascript • Microsoft Edge 91.0.864.67

! Doctor found issues in 1 category.

更新：

当我尝试运行 Flutter doctor 所说的命令时，还有另一个问题：

Flutter doctor --android-licenses

Exception in thread "main" java.lang.NoClassDefFoundError: javax/xml/bind/annotation/XmlSchema
        at com.android.repository.api.SchemaModule$SchemaModuLeversion.<init>(SchemaModule.java:156)
        at com.android.repository.api.SchemaModule.<init>(SchemaModule.java:75)
        at com.android.sdklib.repository.AndroidSdkHandler.<clinit>(AndroidSdkHandler.java:81)
        at com.android.sdklib.tool.sdkmanager.sdkmanagerCli.main(sdkmanagerCli.java:73)
        at com.android.sdklib.tool.sdkmanager.sdkmanagerCli.main(sdkmanagerCli.java:48)
Caused by: java.lang.classNotFoundException: javax.xml.bind.annotation.XmlSchema
        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
        at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
        at java.base/java.lang.classLoader.loadClass(ClassLoader.java:522)
        ... 5 more

解决方法

X Android license status unknown.
      Run `flutter doctor --android-licenses` to accept the SDK licenses.

flutter doctor --android-licenses

$ gradle -q tasks

$ gradle -q tasks --all

$ gradle yayGradle0 groupTherapy

$ gradle gT
$ gradle yG0

$ gradle groupTherapy -x yayGradle0

$ gradle groupTherapy -is
#或者
$ gradle groupTherapy -i-s

$ gradle -h

$ gradle groupTherapy --daemon

$ ps aux | grep gradle

$ gradle groupTherapy --no-daemon

$ gradle --stop

task hellWorld{
    doLast{
        println ''Hello world!''
    }
}

$ gradle -q helloWorld

task helloWorld << {
    println ''Hello world!''
}

task startSession << {
    chant()
}
def chant(){
    ant.echo(message: ''Repeat after me ...'')            //1
}
3.times{
    task "yayGradle$it" << {                            //2
        println ''gradle rocks''
    }
}
yayGradle0.dependsOn startSession
yayGradle2.dependsOn yayGradle1, yayGradle0            //3
task groupTherapy(dependsOn: yayGradle2)

$ gradle groupTherapy

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath "gradle.plugin.org.akhikhl.gretty:gretty:2.0.0"
    }
}
plugins {
    id ''java''
    id ''war''
    id ''org.akhikhl.gretty'' version "2.0.0"
}

gretty {
    httpPort = 8081
    // ''jetty7'', ''jetty8'', ''jetty9'', ''jetty93'', ''jetty94'', ''tomcat7'', ''tomcat8''
    servletContainer = ''jetty9''
    contextPath = ''/''
}