升级Android Studio至3.1.2后出现:app:compileDebugJavaWithJavac编译失败

嘿，升级AS到3.1.2后碰到编译失败的情况太常见了，我之前踩过不少坑，给你几个靠谱的解决思路：

• 对齐Gradle插件与Gradle版本
  AS 3.1.2对应的官方兼容Gradle插件版本是com.android.tools.build:gradle:3.1.2，同时Gradle wrapper建议使用4.4或更高版本（比如4.6）。你需要：

  1. 打开项目根目录下的build.gradle，确保dependencies里的classpath是这个版本：

     dependencies {
         classpath 'com.android.tools.build:gradle:3.1.2'
     }
     

  2. 修改gradle/wrapper/gradle-wrapper.properties中的distributionUrl：

     distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip
     

• 清理缓存并重建项目
  缓存紊乱是这类问题的高发原因，直接来个狠的：

  1. 点击AS顶部菜单栏的File -> Invalidate Caches / Restart，选择Invalidate and Restart重启AS；
  2. 手动删除项目根目录下的.gradle、build文件夹，以及用户目录（比如~/.gradle）下的缓存文件夹，然后重新同步项目（点击Sync Now按钮）。

• 配置Java 8兼容性
  AS 3.1.2对Java 8的要求更严格，很多旧项目没配置的话会编译失败。在app模块的build.gradle里添加：

  android {
      compileOptions {
          sourceCompatibility JavaVersion.VERSION_1_8
          targetCompatibility JavaVersion.VERSION_1_8
      }
      // 如果用了Kotlin，还要加下面这段
      kotlinOptions {
          jvmTarget = "1.8"
      }
  }
  

• 排查依赖冲突
  有些旧依赖和新版Gradle插件不兼容，比如过时的注解处理器或者第三方库。执行以下命令查看依赖树：

  ./gradlew app:dependencies
  

  找出冲突的依赖，比如多个版本的support库，然后用exclude排除或者升级到兼容的版本。

• 临时关闭Lint严格检查（应急用）
  如果是Lint报错导致编译终止，可以先临时关闭abortOnError，但之后一定要修复Lint提示的问题：

  android {
      lintOptions {
          abortOnError false
      }
  }
  

附上你提供的错误日志：

org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:compileDebugJavaWithJavac'. at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:100) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:70) at org.gradle.api.internal.tasks.execution.OutputDirectoryCreatingTaskExecuter.execute(OutputDirectoryCreatingTaskExecuter.java:51) at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:62) at org.gradle.api.internal.tasks.execution.ResolveTaskOutputCachingStateExecuter.execute(ResolveTaskOutputCachingStateExecuter.java:54) at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:60) at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:97) at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:87) at org.gradle.api.internal.tasks.execution.ResolveTaskArtifactStateTaskExecuter.execute(ResolveTaskArtifactStateTaskExecuter.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:54) at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43) at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:34) at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker$1.run(DefaultTaskGraphExecuter.java:248) at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336) at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328) at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199) at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110) at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:241) at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:230) at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.processTask(DefaultTaskPlanExecutor.java:123) at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.access$200(DefaultTaskPlanExecutor.java:79) at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:104) at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:98) at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.execute(DefaultTaskExecutionPlan.java:626) at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.executeWithTask(DefaultTaskExecutionPlan.java:581) at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.run(DefaultTaskPlanExecutor.java:98) at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor.process(DefaultTaskPlanExecutor.java:59) at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:128) 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$1.proceed(DefaultBuildExecuter.java:43) at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:46) at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:37) at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:30) at org.gradle.initialization.DefaultGradleLauncher$ExecuteTasks.run(DefaultGradleLauncher.java:314) at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336) at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328) at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199) at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110) at org.gradle.initialization.DefaultGradleLauncher.runTasks(DefaultGradleLauncher.java:204) at org.gradle.initialization.DefaultGradleLaunch

内容的提问来源于stack exchange，提问作者drojokef