Gradle執行失敗的任務extractReleaseAnnotations> java.lang.NullPointerException

Question

我想設置一個Android庫模塊，它依賴於兩個其他庫模塊。我們使用android.support.annotation框架在一些方法上添加註釋。當我嘗試建立AAR的，這就是我得到：

:hce_entry:extractReleaseAnnotations FAILED 
Error:Execution failed for task ':hce_entry:extractReleaseAnnotations'. 
> java.lang.NullPointerException (no error message) 

我試圖得到一些與--stacktrace選項執行gradle這個版本的詳細信息，這是輸出：

... 
:hce_entry:extractReleaseAnnotations FAILED 

FAILURE: Build failed with an exception. 

What went wrong: 
Execution failed for task ':hce_entry:extractReleaseAnnotations'. 
java.lang.NullPointerException (no error message) 

Try: 
Run with --info or --debug option to get more log output. 

Exception is: 
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':hce_entry:extractReleaseAnnotations'. 
     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:52) 
     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.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:203) 
     at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:185) 
     at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.processTask(AbstractTaskPlanExecutor.java:62) 
     at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.run(AbstractTaskPlanExecutor.java:50) 
     at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor.process(DefaultTaskPlanExecutor.java:25) 
     at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:110) 
     at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:37) 
     at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:37) 
     at org.gradle.execution.DefaultBuildExecuter.access$000(DefaultBuildExecuter.java:23) 
     at org.gradle.execution.DefaultBuildExecuter$1.proceed(DefaultBuildExecuter.java:43) 
     at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:32) 
     at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:37) 
     at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:30) 
     at org.gradle.initialization.DefaultGradleLauncher$4.run(DefaultGradleLauncher.java:154) 
     at org.gradle.internal.Factories$1.create(Factories.java:22) 
     at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:90) 
     at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:52) 
     at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:151) 
     at org.gradle.initialization.DefaultGradleLauncher.access$200(DefaultGradleLauncher.java:32) 
     at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:99) 
     at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:93) 
     at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:90) 
     at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:62) 
     at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:93) 
     at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:82) 
     at org.gradle.launcher.exec.InProcessBuildActionExecuter$DefaultBuildController.run(InProcessBuildActionExecuter.java:94) 
     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:43) 
     at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:28) 
     at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:77) 
     at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:47) 
     at org.gradle.launcher.exec.DaemonUsageSuggestingBuildActionExecuter.execute(DaemonUsageSuggestingBuildActionExecuter.java:51) 
     at org.gradle.launcher.exec.DaemonUsageSuggestingBuildActionExecuter.execute(DaemonUsageSuggestingBuildActionExecuter.java:28) 
     at org.gradle.launcher.cli.RunBuildAction.run(RunBuildAction.java:43) 
     at org.gradle.internal.Actions$RunnableActionAdapter.execute(Actions.java:170) 
     at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:237) 
     at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:210) 
     at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:35) 
     at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:24) 
     at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:206) 
     at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:169) 
     at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:33) 
     at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:22) 
     at org.gradle.launcher.Main.doAction(Main.java:33) 
     at org.gradle.launcher.bootstrap.EntryPoint.run(EntryPoint.java:45) 
     at org.gradle.launcher.bootstrap.ProcessBootstrap.runNoExit(ProcessBootstrap.java:54) 
     at org.gradle.launcher.bootstrap.ProcessBootstrap.run(ProcessBootstrap.java:35) 
     at org.gradle.launcher.GradleMain.main(GradleMain.java:23) 
Caused by: java.lang.NullPointerException 
     at com.android.build.gradle.tasks.annotations.Extractor$AnnotationData.appendExpression(Extractor.java:1603) 
     at com.android.build.gradle.tasks.annotations.Extractor$AnnotationData.attributeString(Extractor.java:1592) 
     at com.android.build.gradle.tasks.annotations.Extractor$AnnotationData.write(Extractor.java:1545) 
     at com.android.build.gradle.tasks.annotations.Extractor$Item.write(Extractor.java:1792) 
     at com.android.build.gradle.tasks.annotations.Extractor.writeExternalAnnotations(Extractor.java:769) 
     at com.android.build.gradle.tasks.annotations.Extractor.export(Extractor.java:271) 
     at com.android.build.gradle.tasks.annotations.Extractor$export$0.call(Unknown Source) 
     at com.android.build.gradle.tasks.ExtractAnnotations.compile(ExtractAnnotations.groovy:172) 
     at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:75) 
     at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.doExecute(AnnotationProcessingTaskFactory.java:227) 
     at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:220) 
     at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:209) 
     at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:585) 
     at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:568) 
     at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:80) 
     at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:61) 
     ... 57 more 


BUILD FAILED 

這是我的build.gradle文件

apply plugin: 'com.android.library' 

android { 
    compileSdkVersion 19 
    buildToolsVersion '19.1.0' 

    buildTypes { 
     release { 
      minifyEnabled false 
      proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' 
     } 
     debug { 
      debuggable true 
      minifyEnabled false 
     } 
    } 
} 

dependencies { 
    compile project(':core') 
    compile project(':lib') 
    compile 'com.android.support:support-v4:23.2.0' 
} 

任何人都可以給我任何建議嗎？我有點迷路，找不到任何解決問題的方法。

預先感謝您。

Answer 1

我剛剛花了幾天的時間試圖跟蹤這個問題，發現它下降到我空着的@IntDef()。具體來說，我有@IntDef({})而不是@IntDef({CONSTANT1, CONSTANT2})