错误：任务':app:compileDebugJavaWithJavac'的执行失败 . >扩展RealmObject类后编译失败

我正在尝试学习Realm for Android，并按照https://realm.io/docs/java/latest/#installation的安装说明进行操作 .

项目build.gradle文件

buildscript {
repositories {
    jcenter()
}
dependencies {
    classpath 'com.android.tools.build:gradle:2.2.2'
    classpath "io.realm:realm-gradle-plugin:2.1.1"

    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
}
}

allprojects {
repositories {
    jcenter()
}
}

task clean(type: Delete) {
 delete rootProject.buildDir
}

app level build.gradle文件

apply plugin: 'com.android.application'
apply plugin: 'realm-android'

android {
compileSdkVersion 25
buildToolsVersion "25.0.0"
defaultConfig {
    applicationId "com.app.practice.realm.realmpractice"
    minSdkVersion 18
    targetSdkVersion 25
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}
}

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
    exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:25.0.0'
testCompile 'junit:junit:4.12'
 }

然后我添加了一个用户扩展RealmObject的类，并尝试编译项目只是为了看到evrything是好的..但我收到错误

Error:Execution failed for task ':app:compileDebugJavaWithJavac'.

编译失败;请参阅编译器错误输出以获取详细信

用户类：

package com.app.practice.realm.realmpractice;

import io.realm.RealmObject;

public class User extends RealmObject {

private int id;
private String name;
}

我的应用程序文件

import android.app.Application;

import io.realm.Realm;

public class MyApplication extends Application {

@Override
public void onCreate() {
    super.onCreate();
    Realm.init(this);
}
}

--Stacktrace o / p

Note: Processing class User
Note: Creating DefaultRealmModule
An exception has occurred in the compiler (1.8.0_05). Please file a bug at     the Java Developer Connection (http://java.sun.com/webapps/bugreport)  after   checking the Bug Parade for duplicates. Include your program and the following diagnostic in your report.  Thank you.

com.sun.tools.javac.code.Symbol $ CompletionFailure：找不到rx.Observable的类文件

FAILED

FAILURE：构建因异常而失败 .

• 出了什么问题：任务执行失败'：app：compileDebugJavaWithJavac' .

编译失败;请参阅编译器错误输出以获取详细信

• 尝试：使用--info或--debug选项运行以获取更多日志输出 .

• 异常是：org.gradle.api.tasks.TaskExecutionException：任务'：app：compileDebugJavaWithJavac'的执行失败 . 在org.gradle上的org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions（ExecuteActionsTaskExecuter.java:69）org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute（ExecuteActionsTaskExecuter.java:46） .api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute（PostExecutionAnalysisTaskExecuter.java:35）在org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute（SkipUpToDateTaskExecuter.java:66）在org.gradle.api.internal .tasks.execution.ValidatingTaskExecuter.execute（ValidatingTaskExecuter.java:58）在org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute（SkipEmptySourceFilesTaskExecuter.java:52）在org.gradle.api.internal.tasks.execution .skipTaskWithNoActionsExecuter.execute（SkipTaskWithNoActionsExecuter.java:52）org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute（SkipOnlyIfTaskExecuter.java:53）at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecu org.gradle.execution.taskgraph.DefaultTaskGraphExecuter上的ter.execute（ExecuteAtMostOnceTaskExecuter.java:43）org.gradle.execution.taskgraph.DefaultTaskGraphExecuter $ EventFiringTaskWorker.exe（EventTaskTraphExecuter.java） 185）在org.gradle.execution.taskgraph.AbstractTaskPlanExecutor $ TaskExecutorWorker.processTask（AbstractTaskPlanExecutor.java:66）在org.gradle.execution.taskgraph.AbstractTaskPlanExecutor $ TaskExecutorWorker.run（AbstractTaskPlanExecutor.java:50）在org.gradle.execution .taskgraph.DefaultTaskPlanExecutor.process（DefaultTaskPlanExecutor.java:25）org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute（DefaultTaskGraphExecuter.java:110）at org.gradle.execution.SelectedTaskExecutionAction.execute（SelectedTaskExecutionAction.java:37）at at org.gradle.execution.DefaultBuildExecuter.execute（DefaultBuildExecuter.java:37）at org.gradle.execution.DefaultBuildExecuter.access $ 000（DefaultBuildExecuter.jav）一：23）在org.gradle.execution.DefaultBuildExecuter $ 1.proceed（在org.gradle.execution.DefaultBuildExecuter.execute DefaultBuildExecuter.java:43）在org.gradle.execution.DryRunBuildExecutionAction.execute（DryRunBuildExecutionAction.java:32）（ DefaultBuildExecuter.java:37）org.gradle.execution.DefaultBuildExecuter.execute（DefaultBuildExecuter.java:30）org.gradle.initialization.DefaultGradleLauncher $ 4.run（DefaultGradleLauncher.java:153）atg.gradle.internal.Factories $ 1 . 或者org.gradle.internal.progress.DefaultOperationExecutor.run（DefaultBuildOperationExecutor.java:53）org.gradle.internal.progress.DefaultBuildOperationExecutor.run（DefaultBuildOperationExecutor.java:91）中的.create（Factories.java:22） . gradle.initialization.DefaultGradleLauncher.doBuildStages（DefaultGradleLauncher.java:150）org.gradle.initialization.DefaultGradleLauncher.access $ 200（DefaultGradleLauncher.java:32）org.gradle.initialization.DefaultGradleLauncher $ 1.create（DefaultGradleLauncher.java:98）在组织 . gradle.initialization.DefaultGradleLauncher $ 1.create（DefaultGradleLauncher.java:92）org.gradle.internal.progress.DefaultBuildOperationExecutor.run（DefaultBuildOperationExecutor.java:91）org.gradle.internal.progress.DefaultBuildOperationExecutor.run（DefaultBuildOperationExecutor.java） ：63）在org.gradle.initialization.DefaultGradleLauncher.doBuild（DefaultGradleLauncher.java:92）at atorg.gradle.initialization.DefaultGradleLauncher.run（DefaultGradleLauncher.java:83）org.gradle.launcher.exec.InProcessBuildActionExecuter $ DefaultBuildController.run（InProcessBuildActionExecuter.java:99）at org.gradle.tooling.internal.provider.runner . org.gradle.launcher.exec.ChainingBuildActionRunner.run（ChainingBuildActionRunner.java:35）中的BuildModelActionRunner.run（BuildModelActionRunner.java:46）位于org.gradle.tooling.internal.provider.runner.SubscribableBuildActionRunner.run（SubscribableBuildActionRunner.java： 58）org.gradle.launcher.exec.ChainingBuildActionRunner.run（ChainingBuildActionRunner.java：35）atg.gradle.launcher.exec.InProcessBuildActionExecuter.execute（InProcessBuildActionExecuter.java:48）org.gradle.launcher.exec.InProcessBuildActionExecuter .execute（InProcessBuildActionExecuter.java:30）org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute（ContinuousBuildActionExecuter.java:81）at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute（Contin uousBuildActionExecuter.java:46）org.gradle.launcher.daemon.server.exe.ExecuteBuild.doBuild（ExecuteBuild.java:52）atg.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute（BuildCommandOnly.java： 36）org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed（DaemonCommandExecution.java:120）org.gradle.launcher.daemon.server.exec.WatchForDisconnection.execute（WatchForDisconnection.java:37）at org .gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed（DaemonCommandExecution.java:120）位于org.gradle.launcher的org.gradle.launcher.daemon.server.exec.ResetDeprecationLogger.execute（ResetDeprecationLogger.java:26） org.gradle.launcher.daemon.server上的org.gradle.launcher.daemon.server.exec.RequestStopIfSingleUsedDaemon.execute（RequestStopIfSingleUsedDaemon.java:34）中的.daemon.server.api.DaemonCommandExecution.proceed（DaemonCommandExecution.java:120） .api.DaemonCommandExecution.proceed（DaemonCommandExecution.java:120）位于org.gradle.launcher.daemon.server.exec . 在org.gradle.util.Swapper.swap的org.gradle.launcher.daemon.server.exec.ForwardClientInput $ 2.call（ForwardClientInput.java:72）中的ForwardClientInput $ 2.call（ForwardClientInput.java:74）（Swapper.java： 38）org.gradle.launcher.daemon.server.exec.ForwardClientInput.execute（ForwardClientInput.java:72）org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed（DaemonCommandExecution.java:120）at org .gradle.launcher.daemon.server.health.DaemonHealthTracker.execute（DaemonHealthTracker.java:47）位于org.gradle.launcher的org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed（DaemonCommandExecution.java:120）位于org.gradle.launcher.daemon.server的org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute（BuildCommandOnly.java:36）中的.daemon.server.exec.LogToClient.doBuild（LogToClient.java:60） .api.DaemonCommandExecution.proceed（DaemonCommandExecution.java:120）at org.gradle.launcher.daemon.server.exec.EstablishBuildEnvironment.doBuild（EstablishBuildEnvironment.java:72）a org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute（BuildCommandOnly.java:36）org.gradle上的org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed（DaemonCommandExecution.java:120）位于org.gradle.launcher.daemon的org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed（DaemonCommandExecution.java:120）的.launcher.daemon.server.health.HintGCAfterBuild.execute（HintGCAfterBuild.java:41） org.gradle.launcher.server.DaemonStateCoordinator $ 1.run（DaemonStateCoordinator.java:237）中的.server.exec.StartBuildOrRespondWithBusy $ 1.run（StartBuildOrRespondWithBusy.java:50）org.gradle.internal.concurrent.ExecutorPolicy $ CatchAndRecordFailures .onExecute（ExecutorPolicy.java:54）at org.gradle.internal.concurrent.StoppableExecutorImpl $ 1.run（StoppableExecutorImpl.java:40）引起：org.gradle.api.internal.tasks.compile.CompilationFailedException：编译失败;请参阅编译器错误输出以获取详细信org.gradle.api.internal.tasks.compile.JdkJavaCompiler.execute（JdkJavaCompiler.java:48）在org.gradle的org.gradle.api.internal.tasks.compile.JdkJavaCompiler.execute（JdkJavaCompiler.java:33）位于org.gradle.api.internal的org.gradle.api.internal.tasks.compile.NormalizingJavaCompiler.execute（NormalizingJavaCompiler.java:53）中的.api.internal.tasks.compile.NormalizingJavaCompiler.delegateAndHandleErrors（NormalizingJavaCompiler.java:104） .tasks.compile.NormalizingJavaCompiler.execute（NormalizingJavaCompiler.java:38）atorg.gradle.api.internal.tasks.compile.CleaningJavaCompilerSupport.execute（CleaningJavaCompilerSupport.java:35）位于org.gradle的org.gradle.api.internal.tasks.compile.CleaningJavaCompilerSupport.execute（CleaningJavaCompilerSupport.java:25） . 位于org.gradle.api.apas.apas.compile.JavaCompile的org.gradle.api.tasks.compile.JavaCompile.compile（JavaCompile.java:145）中的api.tasks.compile.JavaCompile.performCompilation（JavaCompile.java:163） . 在com.android.build.gradle.tasks.factory.AndroidJavaCompile.compile（AndroidJavaCompile.java:49）中编译（JavaCompile.java:93）org.gradle.internal.reflect.JavaMethod.invoke（JavaMethod.java:75） at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory $ IncrementalTaskAction.doExecute（AnnotationProcessingTaskFactory.java:245）at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory $ StandardTaskAction.execute（AnnotationProcessingTaskFactory.java:221）在org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFacto在org.gradle.api.internal.tasks.execution的org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory $ StandardTaskAction.execute（AnnotationProcessingTaskFactory.java:210）中获取$ IncrementalTaskAction.execute（AnnotationProcessingTaskFactory.java:232） . 在org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions（ExecuteActionsTaskExecuter.java:61）的ExecuteActionsTaskExecuter.executeAction（ExecuteActionsTaskExecuter.java:80）... 70更多