Android Studio：运行assembleDebugUnitTest gradle任务时出现空指针异常

Question

我正在尝试为 android studio 中的测试类运行一个简单的 JUNIT 测试。构建顺利。当我尝试运行 JUNIT 测试时，出现以下错误

*

Execution failed for task ':app:mockableAndroidJar'.
> java.lang.NullPointerException (no error message)

*

当我转储堆栈跟踪时，我得到以下信息。我不知道为什么会这样。

:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:mockableAndroidJar'.
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteAc
tionsTaskExecuter.java:69)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTa
skExecuter.java:46)
        at org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecu
tionAnalysisTaskExecuter.java:35)
        at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskEx
ecuter.java:64)
        at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecut
er.java:58)
        at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptyS
ourceFilesTaskExecuter.java:42)
        at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithN
oActionsExecuter.java:52)
        at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecut
er.java:53)
        at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMost
OnceTaskExecuter.java:43)
        at org.gradle.api.internal.AbstractTask.executeWithoutThrowingTaskFailure(AbstractTask.java:31
0)
        at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.executeTask(Abst
ractTaskPlanExecutor.java:79)
        at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.processTask(Abst
ractTaskPlanExecutor.java:63)
        at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.run(AbstractTask
PlanExecutor.java:51)
        at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor.process(DefaultTaskPlanExecutor.java
:23)
        at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.ja
va:88)
        at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:3
7)
        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:14
9)
        at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:106)
        at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:86)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter$DefaultBuildController.run(InProcessB
uildActionExecuter.java:90)
        at org.gradle.tooling.internal.provider.ExecuteBuildActionRunner.run(ExecuteBuildActionRunner.
java:28)
        at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.
java:41)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.
java:28)
        at org.gradle.launcher.exec.DaemonUsageSuggestingBuildActionExecuter.execute(DaemonUsageSugges
tingBuildActionExecuter.java:50)
        at org.gradle.launcher.exec.DaemonUsageSuggestingBuildActionExecuter.execute(DaemonUsageSugges
tingBuildActionExecuter.java:27)
        at org.gradle.launcher.cli.RunBuildAction.run(RunBuildAction.java:40)
        at org.gradle.internal.Actions$RunnableActionAdapter.execute(Actions.java:169)
        at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineAct
ionFactory.java:237)
        at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineAct
ionFactory.java:210)
        at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.jav
a:35)
        at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.jav
a:24)
        at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFacto
ry.java:206)
        at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFacto
ry.java:169)
        at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:33)
        at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:22)
        at org.gradle.launcher.Main.doAction(Main.java:33)
        at org.gradle.launcher.bootstrap.EntryPoint.run(EntryPoint.java:45)
        at org.gradle.launcher.bootstrap.ProcessBootstrap.runNoExit(ProcessBootstrap.java:54)
        at org.gradle.launcher.bootstrap.ProcessBootstrap.run(ProcessBootstrap.java:35)
        at org.gradle.launcher.GradleMain.main(GradleMain.java:23)
        at org.gradle.wrapper.BootstrapMainStarter.start(BootstrapMainStarter.java:33)
        at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:130)
        at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:48)
Caused by: java.lang.NullPointerException
        at org.objectweb.asm.MethodWriter.visitMaxs(Unknown Source)
        at org.objectweb.asm.tree.MethodNode.accept(Unknown Source)
        at org.objectweb.asm.tree.MethodNode.accept(Unknown Source)
        at org.objectweb.asm.tree.ClassNode.accept(Unknown Source)
        at com.android.builder.testing.MockableJarGenerator.rewriteClass(MockableJarGenerator.java:134
)
        at com.android.builder.testing.MockableJarGenerator.createMockableJar(MockableJarGenerator.jav
a:91)
        at com.android.build.gradle.internal.tasks.MockableAndroidJarTask.createMockableJar(MockableAn
droidJarTask.groovy:50)
        at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:75)
        at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAct
ion.doExecute(AnnotationProcessingTaskFactory.java:226)
        at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAct
ion.execute(AnnotationProcessingTaskFactory.java:219)
        at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAct
ion.execute(AnnotationProcessingTaskFactory.java:208)
        at org.gradle.api.internal.AbstractTask$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(ExecuteAct
ionsTaskExecuter.java:80)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteAc
tionsTaskExecuter.java:61)
        ... 49 more

使用的测试环境：

环境：1.2.2 SDK版本：API 21 构建工具 22.0.1 安卓插件版本：1.2.3 摇篮版本：2.5 JDK：1.7.0_79

你能帮我解决这个问题吗？我的设置有问题吗？

构建 Gradle 文件：

apply plugin: 'com.android.application'


android {
    compileSdkVersion 21
    buildToolsVersion "22.0.1"

    defaultConfig {
        applicationId "com.example.krishnaswamyna.testmathsapplication"
        minSdkVersion 21
        targetSdkVersion 21
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    compile 'com.android.support:recyclerview-v7:22.2.1'
    compile 'com.android.support:leanback-v17:22.2.1'
    testCompile 'junit:junit:4.12'
    testCompile 'org.mockito:mockito-core:2.0.31-beta'
    testCompile 'org.robolectric:robolectric:3.0'
}

Answer 1

删除项目中的.gradle文件即可

Answer 2

几周后我也遇到了同样的问题。我从here 看到了关于 SDK 问题的提示。

对我有用的是简单地通过 SDK 管理器删除 SDK，然后重新安装它。在删除和重新安装 SDK 之间，您可能还必须清理项目和/或使现金无效并重新启动 Android Studio。

Answer 3

我在安装 Android Studio 2.0 时遇到了同样的问题。

取消选中Enable all test artifacts：

文件->设置->构建、执行、部署->构建工具-> Gradle-> 实验 gradle

信息：link

Answer 4

清理构建并重新构建应用程序，这可能会起作用并解决问题。这个gradle错误可能是由于一些旧的编辑文件只是按照上面说的。