问题在于通过 Room 创建数据库答案

【问题标题】：The problem is in creating a database through the Room问题在于通过 Room 创建数据库
【发布时间】：2020-12-24 18:07:46
【问题描述】：

我尝试使用 kotlin 中的 Room 将数据保存到本地数据库。我在 gradle.build 中的依赖项：

    def room_version = "2.2.0-rc01"
    implementation "androidx.room:room-runtime:$room_version"
    kapt "androidx.room:room-compiler:$room_version"

    compile 'com.google.code.gson:gson:2.2.4'
    implementation 'io.reactivex.rxjava2:rxandroid:2.0.2'
    implementation 'io.reactivex.rxjava2:rxjava:2.1.17'

插件：

id 'kotlin-kapt'

处理这个注解时，数据库类发生错误

@Database(entities = [CarsInfoDatabase::class], version = 1)

Execution failed for task ':homework5:kaptDebugKotlin'.
> A failure occurred while executing org.jetbrains.kotlin.gradle.internal.KaptExecution
   > java.lang.reflect.InvocationTargetException (no error message)

* Try:
Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':homework5:kaptDebugKotlin'.
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.lambda$executeIfValid$1(ExecuteActionsTaskExecuter.java:200)
    at org.gradle.internal.Try$Failure.ifSuccessfulOrElse(Try.java:263)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeIfValid(ExecuteActionsTaskExecuter.java:198)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:179)
    at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:109)
    at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:46)
    at org.gradle.api.internal.tasks.execution.ResolveTaskExecutionModeExecuter.execute(ResolveTaskExecutionModeExecuter.java:62)
    at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:57)
    at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:56)
    at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:36)
    at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:77)
    at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:55)
    at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:52)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:200)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:195)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:75)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:68)
    at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:153)
    at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:68)
    at org.jetbrains.kotlin.kapt3.base.AnnotationProcessingKt.doAnnotationProcessing$default(annotationProcessing.kt:35)
    at org.jetbrains.kotlin.kapt3.base.Kapt.kapt(Kapt.kt:45)
    ... 31 more

我该如何解决这个问题？ :(

【问题讨论】：

标签： android kotlin android-room kapt

【解决方案1】：

你可以试试这个吗？将编译替换为实现

应用级 build.gradle

apply plugin: 'kotlin-kapt'
...
implementation 'com.google.code.gson:gson:2.8.5'
implementation 'androidx.room:room-runtime:2.2.4'
implementation 'androidx.room:room-ktx:2.2.4' //I think this dependency remain
implementation "androidx.room:room-rxjava2:2.2.4"
kapt 'androidx.room:room-compiler:2.2.4'

项目级 build.gradle

classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.61'

【讨论】：

【解决方案2】：

你应该添加你的插件

apply plugin: 'kotlin-kapt'

【讨论】：