在android中获取java.lang.NullPointerException
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【中文标题】在android中获取java.lang.NullPointerException【英文标题】：getting java.lang.NullPointerException in android 【发布时间】：2020-06-01 05:28:52 【问题描述】：我正在使用 firebase crashlytics 测试版来解决 ndk 崩溃问题。我正在遵循here 给出的所有步骤。但我面临一个问题，无法上传符号文件。每当我要运行任务./gradlew uploadCrashlyticsSymbolFileDebug --stacktrace 时，它都会显示java.lang.NullPointerException。但是为什么以及在哪里是 null？
这里是这个任务的完整堆栈跟踪
> Task :app:generateCrashlyticsSymbolFileDebug FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:generateCrashlyticsSymbolFileDebug'.
> java.lang.NullPointerException (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 ':app:generateCrashlyticsSymbolFileDebug'.
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$3.accept(ExecuteActionsTaskExecuter.java:151)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$3.accept(ExecuteActionsTaskExecuter.java:148)
at org.gradle.internal.Try$Failure.ifSuccessfulOrElse(Try.java:191)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:141)
at org.gradle.api.internal.tasks.execution.ResolveBeforeExecutionStateTaskExecuter.execute(ResolveBeforeExecutionStateTaskExecuter.java:75)
at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:62)
at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:108)
at org.gradle.api.internal.tasks.execution.ResolveBeforeExecutionOutputsTaskExecuter.execute(ResolveBeforeExecutionOutputsTaskExecuter.java:67)
at org.gradle.api.internal.tasks.execution.ResolveAfterPreviousExecutionStateTaskExecuter.execute(ResolveAfterPreviousExecutionStateTaskExecuter.java:46)
at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:94)
at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:46)
at org.gradle.api.internal.tasks.execution.ResolveTaskExecutionModeExecuter.execute(ResolveTaskExecutionModeExecuter.java:95)
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:73)
at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:52)
at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:49)
at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:416)
at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:406)
at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:165)
at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:250)
at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:158)
at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:102)
at org.gradle.internal.operations.DelegatingBuildOperationExecutor.call(DelegatingBuildOperationExecutor.java:36)
at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:49)
at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:43)
at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:355)
at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:343)
at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:336)
at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:322)
at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker$1.execute(DefaultPlanExecutor.java:134)
at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker$1.execute(DefaultPlanExecutor.java:129)
at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:202)
at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.executeNextNode(DefaultPlanExecutor.java:193)
at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:129)
at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63)
at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:46)
at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55)
Caused by: java.lang.NullPointerException
at com.google.firebase.crashlytics.buildtools.ndk.internal.dwarf.DwarfDataParser.processDebugInfoEntry(DwarfDataParser.java:297)
at com.google.firebase.crashlytics.buildtools.ndk.internal.dwarf.DwarfDataParser.processChildDebugInfoEntries(DwarfDataParser.java:269)
at com.google.firebase.crashlytics.buildtools.ndk.internal.dwarf.DwarfDataParser.processCompilationUnit(DwarfDataParser.java:194)
at com.google.firebase.crashlytics.buildtools.ndk.internal.dwarf.DwarfDataParser.readCompilationUnit(DwarfDataParser.java:173)
at com.google.firebase.crashlytics.buildtools.ndk.internal.dwarf.DwarfDataParser.readCompilationUnit(DwarfDataParser.java:139)
at com.google.firebase.crashlytics.buildtools.ndk.internal.dwarf.DwarfDataParser.parse(DwarfDataParser.java:63)
at com.google.firebase.crashlytics.buildtools.ndk.internal.elf.ElfDataParser.parseElf(ElfDataParser.java:132)
at com.google.firebase.crashlytics.buildtools.ndk.internal.elf.ElfDataParser.parse(ElfDataParser.java:101)
at com.google.firebase.crashlytics.buildtools.ndk.internal.elf.ElfDataParser.parse(ElfDataParser.java:39)
at com.google.firebase.crashlytics.buildtools.ndk.internal.csym.ElfCSymFactory.createCSymFromFile(ElfCSymFactory.java:92)
at com.google.firebase.crashlytics.buildtools.ndk.internal.csym.NdkCSymGenerator.generateCodeMappings(NdkCSymGenerator.java:101)
at com.google.firebase.crashlytics.buildtools.ndk.internal.csym.NdkCSymGenerator.generateCodeMappings(NdkCSymGenerator.java:90)
at com.google.firebase.crashlytics.buildtools.ndk.internal.csym.NdkCSymGenerator.generateFromDirectories(NdkCSymGenerator.java:44)
at com.google.firebase.crashlytics.buildtools.Buildtools.generateNativeSymbolFile(Buildtools.java:157)
at com.google.firebase.crashlytics.buildtools.Buildtools$generateNativeSymbolFile$3.call(Unknown Source)
at com.google.firebase.crashlytics.buildtools.gradle.tasks.GenerateSymbolFileTask.generateSymbols(GenerateSymbolFileTask.groovy:45)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:103)
at org.gradle.api.internal.project.taskfactory.StandardTaskAction.doExecute(StandardTaskAction.java:48)
at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:41)
at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:28)
at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:702)
at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:669)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$5.run(ExecuteActionsTaskExecuter.java:404)
at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:402)
at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:394)
at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:165)
at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:250)
at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:158)
at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:92)
at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:393)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:376)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.access$200(ExecuteActionsTaskExecuter.java:80)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$TaskExecution.execute(ExecuteActionsTaskExecuter.java:213)
at org.gradle.internal.execution.steps.ExecuteStep.lambda$execute$1(ExecuteStep.java:33)
at org.gradle.internal.execution.steps.ExecuteStep.execute(ExecuteStep.java:33)
at org.gradle.internal.execution.steps.ExecuteStep.execute(ExecuteStep.java:26)
at org.gradle.internal.execution.steps.CleanupOutputsStep.execute(CleanupOutputsStep.java:58)
at org.gradle.internal.execution.steps.CleanupOutputsStep.execute(CleanupOutputsStep.java:35)
at org.gradle.internal.execution.steps.ResolveInputChangesStep.execute(ResolveInputChangesStep.java:48)
at org.gradle.internal.execution.steps.ResolveInputChangesStep.execute(ResolveInputChangesStep.java:33)
at org.gradle.internal.execution.steps.CancelExecutionStep.execute(CancelExecutionStep.java:39)
at org.gradle.internal.execution.steps.TimeoutStep.executeWithoutTimeout(TimeoutStep.java:73)
at org.gradle.internal.execution.steps.TimeoutStep.execute(TimeoutStep.java:54)
at org.gradle.internal.execution.steps.CatchExceptionStep.execute(CatchExceptionStep.java:35)
at org.gradle.internal.execution.steps.CreateOutputsStep.execute(CreateOutputsStep.java:51)
at org.gradle.internal.execution.steps.SnapshotOutputsStep.execute(SnapshotOutputsStep.java:45)
at org.gradle.internal.execution.steps.SnapshotOutputsStep.execute(SnapshotOutputsStep.java:31)
at org.gradle.internal.execution.steps.CacheStep.executeWithoutCache(CacheStep.java:201)
at org.gradle.internal.execution.steps.CacheStep.execute(CacheStep.java:70)
at org.gradle.internal.execution.steps.CacheStep.execute(CacheStep.java:45)
at org.gradle.internal.execution.steps.BroadcastChangingOutputsStep.execute(BroadcastChangingOutputsStep.java:49)
at org.gradle.internal.execution.steps.StoreSnapshotsStep.execute(StoreSnapshotsStep.java:43)
at org.gradle.internal.execution.steps.StoreSnapshotsStep.execute(StoreSnapshotsStep.java:32)
at org.gradle.internal.execution.steps.RecordOutputsStep.execute(RecordOutputsStep.java:38)
at org.gradle.internal.execution.steps.RecordOutputsStep.execute(RecordOutputsStep.java:24)
at org.gradle.internal.execution.steps.SkipUpToDateStep.executeBecause(SkipUpToDateStep.java:96)
at org.gradle.internal.execution.steps.SkipUpToDateStep.lambda$execute$0(SkipUpToDateStep.java:89)
at org.gradle.internal.execution.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:54)
at org.gradle.internal.execution.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:38)
at org.gradle.internal.execution.steps.ResolveChangesStep.execute(ResolveChangesStep.java:77)
at org.gradle.internal.execution.steps.ResolveChangesStep.execute(ResolveChangesStep.java:37)
at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsFinishedStep.execute(MarkSnapshottingInputsFinishedStep.java:36)
at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsFinishedStep.execute(MarkSnapshottingInputsFinishedStep.java:26)
at org.gradle.internal.execution.steps.ResolveCachingStateStep.execute(ResolveCachingStateStep.java:90)
at org.gradle.internal.execution.steps.ResolveCachingStateStep.execute(ResolveCachingStateStep.java:48)
at org.gradle.internal.execution.impl.DefaultWorkExecutor.execute(DefaultWorkExecutor.java:33)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:120)
... 35 more
我已按照 firebase ndk crashlytics 的所有步骤进行操作。但没有运气
这是我的应用级build.gradle 文件
apply plugin: 'com.android.application'
apply plugin: 'com.google.firebase.crashlytics'
android
compileSdkVersion 29
defaultConfig
applicationId "com.ndk.demo"
minSdkVersion 18
targetSdkVersion 29
versionCode 1
versionName "1.0"
multiDexEnabled true
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
externalNativeBuild
cmake
//version "3.10.2"
cppFlags "-std=c++11 -frtti -fexceptions"
abiFilters "arm64-v8a", "armeabi-v7a", "x86", "x86_64"
sourceSets.main
jniLibs.srcDirs = ['libs']
jni.srcDirs = []
externalNativeBuild
cmake
path "CMakeLists.txt"
splits
abi
enable true
reset()
include "arm64-v8a", "armeabi-v7a", "x86", "x86_64"
exclude "armeabi"
universalApk true
buildTypes
release
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
firebaseCrashlytics
nativeSymbolUploadEnabled true
// mappingFileUploadEnabled true
debug
minifyEnabled false
debuggable true
firebaseCrashlytics
nativeSymbolUploadEnabled true
// mappingFileUploadEnabled true
dexOptions
preDexLibraries false
javaMaxHeapSize "4g"
configurations.all
resolutionStrategy.force 'com.google.code.findbugs:jsr305:1.3.9'
dataBinding
enabled = true
compileOptions
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
packagingOptions
doNotStrip "*/armeabi/*.so"
/*afterEvaluate
if (gradle.startParameter.taskNames.contains(":app:assembleDebug"))
assembleDebug.finalizedBy("uploadCrashlyticsSymbolFileDebug")
else if (gradle.startParameter.taskNames.contains(":app:assembleRelease"))
assembleRelease.finalizedBy("uploadCrashlyticsSymbolFileRelease")
*/
dependencies
implementation 'androidx.appcompat:appcompat:1.1.0'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
implementation 'androidx.multidex:multidex:2.0.1'
//new crashlytics
implementation 'com.google.android.gms:play-services-auth:17.0.0'
implementation 'com.google.firebase:firebase-core:17.2.2'
implementation 'com.google.firebase:firebase-analytics:17.2.2'
implementation 'com.google.firebase:firebase-crashlytics:17.0.0-beta01'
implementation 'com.google.firebase:firebase-crashlytics-ndk:17.0.0-beta01'
apply plugin: 'com.google.gms.google-services'
apply from: "../artifacts.gradle"
请有人帮我解决这个错误。
提前致谢。
【问题讨论】：
如果您在buildTypes 中删除nativeSymbolUploadEnabled 以进行调试和发布，您还能获得NPE 吗？
@harrytmthy 没有nativeSymbolUploadEnabled 我将如何运行uploadCrashlyticsSymbolFileDebug 任务？这是 ndk crashlytics 的必需参数
我在我们的项目中遇到了同样的问题，并通过 GitHub 报告了它：github.com/firebase/firebase-android-sdk/issues/1357。我还联系了他们的开发支持，他们说团队目前正在对此进行调查。我的猜测是它是由解析我们的一个静态库引起的。
我不知道为什么，但现在我没有收到此错误。我做了一些更改，但我不记得了。
【参考方案1】：
您不应该一起组装、安装和运行。特别是如果您启用了并行构建，那将是一个问题。 install 和 installDevice 是不同的。 install 来自 Android 插件并安装在所有设备上。 installDevice 来自我们的插件并安装在给定的设备上。默认情况下第一个，可以用 -PdeviceId=
覆盖您可以尝试以下方法：
您能与我们分享您的 gradle 和 Android 插件版本吗？ 尝试使用 ./gradlew runDebug。这将为您组装和安装。 您也可以在常规的 Android installDebug 任务之后执行 startDebug。如果您需要自己运行安装任务，这将只是启动而不是安装和启动，这很有用。 如果您启用了并行，您可以尝试使用 --no-parallel 命令行参数吗？
【讨论】：
感谢您的回复，能否详细说明您的答案？我听不懂你在说什么。什么是 install 和 installDevice 和 -PdeviceId=。我在哪里可以找到这个？而且我没有任何名为runDebug 的任务。我将如何运行此任务？
请注意，没有afterEvaluate我可以成功运行应用程序
我使用的是 3.5.3 gradle 版本
“我正在使用 firebase crashlytics beta 版解决 ndk 崩溃问题”，这是您的问题，请报告此错误并希望得到修复！以上是关于在android中获取java.lang.NullPointerException的主要内容，如果未能解决你的问题，请参考以下文章
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