无法读取映射文件，Gradle 任务执行异常 [Android]

Question

在构建发布版本时，我从 Gradle 收到了这个奇怪的错误。我在我的项目中设置了不同的风格，即 QC、Staging、Live。在 QC 和 Live 风格上构建发布版本非常有效，但是每当我尝试通过 Staging Flavor 创建发布版本时，它都会抛出这个 gradle 异常。

:app:retraceStagingReleaseMainDexClassList FAILED
FAILURE: Build failed with an exception.
* Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:retraceStagingReleaseMainDexClassList'.
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:69)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:46)
    at org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecutionAnalysisTaskExecuter.java:35)
    at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:64)
    at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:58)
    at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:42)
    at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52)
    at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:53)
    at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43)
    at org.gradle.api.internal.AbstractTask.executeWithoutThrowingTaskFailure(AbstractTask.java:310)
    at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.executeTask(AbstractTaskPlanExecutor.java:79)
    at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.processTask(AbstractTaskPlanExecutor.java:63)
    at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.run(AbstractTaskPlanExecutor.java:51)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor.process(DefaultTaskPlanExecutor.java:23)
    at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:88)
    at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:37)
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:62)
    at org.gradle.execution.DefaultBuildExecuter.access$200(DefaultBuildExecuter.java:23)
    at org.gradle.execution.DefaultBuildExecuter$2.proceed(DefaultBuildExecuter.java:68)
    at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:32)
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:62)
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:55)
    at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:149)
    at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:106)
    at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:86)
    at org.gradle.launcher.exec.InProcessBuildActionExecuter$DefaultBuildController.run(InProcessBuildActionExecuter.java:90)
    at org.gradle.tooling.internal.provider.runner.BuildModelActionRunner.run(BuildModelActionRunner.java:54)
    at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35)
    at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:41)
    at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:28)
    at org.gradle.launcher.daemon.server.exec.ExecuteBuild.doBuild(ExecuteBuild.java:49)
    at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36)
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)
    at org.gradle.launcher.daemon.server.exec.WatchForDisconnection.execute(WatchForDisconnection.java:37)
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)
    at org.gradle.launcher.daemon.server.exec.ResetDeprecationLogger.execute(ResetDeprecationLogger.java:26)
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)
    at org.gradle.launcher.daemon.server.exec.RequestStopIfSingleUsedDaemon.execute(RequestStopIfSingleUsedDaemon.java:34)
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)
    at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:74)
    at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:72)
    at org.gradle.util.Swapper.swap(Swapper.java:38)
    at org.gradle.launcher.daemon.server.exec.ForwardClientInput.execute(ForwardClientInput.java:72)
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)
    at org.gradle.launcher.daemon.server.health.DaemonHealthTracker.execute(DaemonHealthTracker.java:47)
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)
    at org.gradle.launcher.daemon.server.exec.LogToClient.doBuild(LogToClient.java:66)
    at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36)
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)
    at org.gradle.launcher.daemon.server.exec.EstablishBuildEnvironment.doBuild(EstablishBuildEnvironment.java:71)
    at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36)
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)
    at org.gradle.launcher.daemon.server.health.HintGCAfterBuild.execute(HintGCAfterBuild.java:41)
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)
    at org.gradle.launcher.daemon.server.exec.StartBuildOrRespondWithBusy$1.run(StartBuildOrRespondWithBusy.java:50)
    at org.gradle.launcher.daemon.server.DaemonStateCoordinator$1.run(DaemonStateCoordinator.java:246)
    at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:54)
    at org.gradle.internal.concurrent.StoppableExecutorImpl$1.run(StoppableExecutorImpl.java:40)
Error:java.lang.RuntimeException: unable to read mapping file.
    at com.android.build.gradle.internal.tasks.multidex.RetraceMainDexList.createDict(RetraceMainDexList.groovy:113)
    at com.android.build.gradle.internal.tasks.multidex.RetraceMainDexList$createDict.callStatic(Unknown Source)
    at com.android.build.gradle.internal.tasks.multidex.RetraceMainDexList.retrace(RetraceMainDexList.groovy:85)
    at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:75)
    at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.doExecute(AnnotationProcessingTaskFactory.java:226)
    at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:219)
    at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:208)
    at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:589)
    at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:572)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:80)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:61)

我在我的 Android 项目中启用了 Multidex 和 proguard。自从我将编译和构建 SDK 升级到 Android M 以来，一直抛出此错误。我已按照 Google Docs 中有关升级项目的所有说明进行操作。这是build.gradle文件的sn-p。

android {
    compileSdkVersion 23
    buildToolsVersion "22.0.1"
    useLibrary 'org.apache.http.legacy'

    defaultConfig {
        applicationId "com.example"
        minSdkVersion 10
        targetSdkVersion 23
        versionCode 15091000
        versionName "5.0.2"
        multiDexEnabled true
    }

    dexOptions {
        incremental true
        preDexLibraries = false
        jumboMode = true
        javaMaxHeapSize "4G"

    }

    productFlavors {
        qc {
            applicationId = "com.example.qc"
            versionName "5.0.2.8"
            buildConfigField  "int", "appMode", "1"
        }
        dev {
            applicationId = "com.example.dev"
            versionName "5.0.2.8"
            buildConfigField  "int", "appMode", "2"
        }
        staging {
            applicationId = "com.example.staging"
            versionName "5.0.2.8"
            buildConfigField  "int", "appMode", "4"
        }
        prod {
            applicationId = "com.example"
            versionName "5.0.2.8"
            buildConfigField  "int", "appMode", "5"
        }
    }
    buildTypes {
        debug {
//            applicationIdSuffix ".debug"
            minifyEnabled false
            shrinkResources false
            debuggable true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
        release {
            minifyEnabled true
            shrinkResources true
            zipAlignEnabled true
            debuggable false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    packagingOptions {
        exclude 'META-INF/DEPENDENCIES.txt'
        exclude 'META-INF/LICENSE.txt'
        exclude 'META-INF/NOTICE.txt'
        exclude 'META-INF/NOTICE'
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/DEPENDENCIES'
        exclude 'META-INF/notice.txt'
        exclude 'META-INF/license.txt'
        exclude 'META-INF/dependencies.txt'
        exclude 'META-INF/LGPL2.1'
    }
}

我在 Stackoverflow 和 Google 论坛上对此问题进行了很多研究。他们说，这可能是由于达到了 64k 方法限制，为此，我现在使用 MultiDex 支持，为方法数大于 64k 的项目构建多个 dex 文件。但我想，这与 Staging Build 抛出此错误没有任何关系，而其他风格正在生成没有任何错误的发布版本。

我在 build.gradle 文件中看不出产品风格有什么不同。有没有人碰巧遇到过这种问题？请帮忙！

Answer 1

我对 ProGuard 和 MultiDex 也有同样的问题。我发现 NewRelic 插件（v1.3.+）在 mapping.txt 中附加了一行，例如“# NR_BUILD_ID: XXXXX-XXXXXX-XXXXXXX-XXXXXXXX”，我认为这就是问题所在。

正如您在 Android gradle googlesource 中看到的，groovy 文件 RetraceMainDexList（第 105 行），如果在 mapping.txt 中找到以 no-space 开头的行，它将引发 RuntimeException("unable to read mapping file.")并且不包含“->”字符串。因此，NR 附加到 ma​​pping.txt 的行会引发此异常并使 :retraceMainDexClassList 任务崩溃。

如果您删除 # NR_BUILD_ID 行，应用程序运行正常。

我已将此问题发送给 NewRelic 支持，他们证实了我的发现。他们告诉我该问题已发送给开发人员以供其处理。

我希望这会有所帮助。