填坑app:compileDebugJavaWithJavac

Android Error:Execution failed for task':app:compileDebugJavaWithJavac'和':app:transformJackWithJackForDebug'.

以前在mac上開發的一個項目，現在想換到pc上

安裝jdk->配置環境變量->安裝Android Studio 3.1.2， ok，一切都順利進行，導入項目，修改了一些版本更新後的操做，ok，也沒有問題，運行項目，好吧，出問題了，

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.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:63)
	at org.gradle.api.internal.tasks.execution.ResolveTaskOutputCachingStateExecuter.execute(ResolveTaskOutputCachingStateExecuter.java:54)
	at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:58)
	at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:88)
	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$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328)
	at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:197)
	at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:107)
	at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$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:124)
	at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.access$200(DefaultTaskPlanExecutor.java:80)
	at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:105)
	at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:99)
	at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.execute(DefaultTaskExecutionPlan.java:625)
	at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.executeWithTask(DefaultTaskExecutionPlan.java:580)
	at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.run(DefaultTaskPlanExecutor.java:99)
	at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63)
	at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:46)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55)
	at java.lang.Thread.run(Thread.java:745)
Caused by: org.gradle.api.internal.tasks.compile.CompilationFailedException: Compilation failed; see the compiler error output for details.
	at org.gradle.api.internal.tasks.compile.JdkJavaCompiler.execute(JdkJavaCompiler.java:51)
	at org.gradle.api.internal.tasks.compile.JdkJavaCompiler.execute(JdkJavaCompiler.java:36)
	at org.gradle.api.internal.tasks.compile.NormalizingJavaCompiler.delegateAndHandleErrors(NormalizingJavaCompiler.java:99)
	at org.gradle.api.internal.tasks.compile.NormalizingJavaCompiler.execute(NormalizingJavaCompiler.java:52)
	at org.gradle.api.internal.tasks.compile.NormalizingJavaCompiler.execute(NormalizingJavaCompiler.java:37)
	at org.gradle.api.internal.tasks.compile.CleaningJavaCompilerSupport.execute(CleaningJavaCompilerSupport.java:35)
	at org.gradle.api.internal.tasks.compile.CleaningJavaCompilerSupport.execute(CleaningJavaCompilerSupport.java:25)
	at org.gradle.api.tasks.compile.JavaCompile.performCompilation(JavaCompile.java:198)
	at org.gradle.api.tasks.compile.JavaCompile.compile(JavaCompile.java:183)
	at org.gradle.api.tasks.compile.JavaCompile.compile(JavaCompile.java:120)
	at com.android.build.gradle.tasks.factory.AndroidJavaCompile.compile(AndroidJavaCompile.java:49)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:73)
	at org.gradle.api.internal.project.taskfactory.DefaultTaskClassInfoStore$IncrementalTaskAction.doExecute(DefaultTaskClassInfoStore.java:173)
	at org.gradle.api.internal.project.taskfactory.DefaultTaskClassInfoStore$StandardTaskAction.execute(DefaultTaskClassInfoStore.java:134)
	at org.gradle.api.internal.project.taskfactory.DefaultTaskClassInfoStore$StandardTaskAction.execute(DefaultTaskClassInfoStore.java:121)
	at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$1.run(ExecuteActionsTaskExecuter.java:122)
	at org.gradle.internal.progress.DefaultBuildOperationExecutor$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:197)
	at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:107)
	at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:111)
	at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:92)
	... 30 more複製代碼

第一反應就是去clean一下，而後rebuild，再次運行，仍是不行。

接下來老規矩，問google，發現關於這個問題的博客還真很多，解決方案以下：

1. 關閉增量編譯，在bulide.gradle文件中android{ ... } 下compileOptions{}中加一行incremental = false;
2. 將項目中用到java8的方法還原到java7；
3. Check build.gradle(Module: Android) fixed problem 升級build.gradle中的buildToolsVersion到最新的版本；
   
4. 升級Android Studio的版本（Help->Check for Updates...） 以及 配置JAVA_HOME的路徑；
5. 移除

   jackOptions{
       enabled true 
   }compileOptions {
       sourceCompatibility JavaVersion.VERSION_1_8
       targetCompatibility JavaVersion.VERSION_1_8
       incremental false
   }
   複製代碼

一個一個來，全都試完了，仍是不能解決這個問題，腦殼大了

有問題總得結局，硬着頭皮在google上搜了兩天，終於功夫不負有心人，找到了答案：

形成 app:compileDebugJavaWithJavac的緣由是jdk8 編譯的方式和以前版本的編譯方式變了，因此代碼裏面有語法錯誤或者類路徑錯誤會致使編譯不能經過而報出這個異常，這裏簡單講下新版和舊版的jdk的編譯方式的區別。

舊版 javac 工具鏈：
javac (.java –> .class) –> dx (.class –> .dex)新版 Jack 工具鏈：
Jack (.java –> .jack –> .dex)
複製代碼

（僞裝很懂的樣子...）

知道問題緣由了，就來解決問題

在Teriminal中輸入命令：

gradlew compileDebugSources --stacktrace -info
複製代碼

回車

All input files are considered out-of-date for incremental task ':app:compileDebugJavaWithJavac'.
Compiling with source level 1.8 and target level 1.8.
file or directory 'E:\android-studio\AndroidStudioProjects\Ailianmeng\app\src\debug\java', not found
Compiling with JDK Java compiler API.
E:\android-studio\AndroidStudioProjects\Ailianmeng\app\src\main\java\com\aili\ailianmeng\application\AlmApplication.java:18: 錯誤: 程序包com.hyphenate.chat不存在
import com.hyphenate.chat.EMClient;
                         ^
E:\android-studio\AndroidStudioProjects\Ailianmeng\app\src\main\java\com\aili\ailianmeng\application\AlmApplication.java:19: 錯誤: 程序包com.hyphenate.chat不存在
import com.hyphenate.chat.EMOptions;
                         ^
E:\android-studio\AndroidStudioProjects\Ailianmeng\app\src\main\java\com\aili\ailianmeng\moudle\easeui\EaseuiHelper.java:32: 錯誤: 找不到符號
import com.hyphenate.EMConnectionListener;
                    ^
  符號:   類 EMConnectionListener
  位置: 程序包 com.hyphenate
E:\android-studio\AndroidStudioProjects\Ailianmeng\app\src\main\java\com\aili\ailianmeng\moudle\easeui\EaseuiHelper.java:33: 錯誤: 找不到符號
import com.hyphenate.EMError;
                    ^
  符號:   類 EMError
  位置: 程序包 com.hyphenate
E:\android-studio\AndroidStudioProjects\Ailianmeng\app\src\main\java\com\aili\ailianmeng\moudle\easeui\EaseuiHelper.java:34: 錯誤: 找不到符號
import com.hyphenate.EMMessageListener;
                    ^
  符號:   類 EMMessageListener
  位置: 程序包 com.hyphenate
E:\android-studio\AndroidStudioProjects\Ailianmeng\app\src\main\java\com\aili\ailianmeng\moudle\easeui\EaseuiHelper.java:35: 錯誤: 程序包com.hyphenate.chat不存在
import com.hyphenate.chat.EMClient;複製代碼

環信的問題，找到問題所在位置，挨個兒解決吧