我按照official guide中的说明完成了Android Studio 3中一些项目的迁移，但是在尝试在App Engine endpoints 后端模块上的gradle上运行 endpointsDiscoveryDocs 目标时出现错误 .
该错误是嵌套 NoClassDefFound 初始化 GenClientLibAction ：
引起：java.lang.NoClassDefFoundError：无法初始化类com.google.api.server.spi.tools.GenClientLibAction
这是我的设置文件：
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.google.cloud.tools:endpoints-framework-gradle-plugin:1.0.2'
classpath 'com.google.cloud.tools:appengine-gradle-plugin:1.3.3'
}
}
repositories {
jcenter();
}
apply plugin: 'java'
apply plugin: 'war'
//apply plugin: 'appengine'
apply plugin: 'com.google.cloud.tools.appengine' // App Engine tasks
apply plugin: 'com.google.cloud.tools.endpoints-framework-server'
sourceCompatibility = JavaVersion.VERSION_1_7
targetCompatibility = JavaVersion.VERSION_1_7
dependencies {
//appengineSdk 'com.google.appengine:appengine-java-sdk:1.9.54'
providedCompile group: 'javax.servlet', name: 'servlet-api', version:'2.5'
compile 'com.google.endpoints:endpoints-framework:2.0.8'
compile 'com.google.endpoints:endpoints-framework-tools:2.0.8'
compile 'javax.inject:javax.inject:1'
compile 'javax.servlet:servlet-api:2.5'
implementation 'com.googlecode.objectify:objectify:5.1.17'
implementation 'com.ganyo:gcm-server:1.0.2'
implementation 'com.google.firebase:firebase-server-sdk:3.0.3'
implementation 'com.google.appengine.tools:appengine-gcs-client:0.6'
}
endpointsServer {
// Endpoints Framework Plugin server-side configuration
hostname = "libre-gluten.appspot.com"
}
堆栈如下
org.gradle.api.tasks.TaskExecutionException：任务'：后端：endpointsDiscoveryDocs'的执行失败 . 在org.gradle上的org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions（ExecuteActionsTaskExecuter.java:100）org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute（ExecuteActionsTaskExecuter.java:70）位于org.gradle.api.internal的org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute（SkipUpToDateTaskExecuter.java:63）上的.api.internal.tasks.execution.SkipCachedTaskExecuter.execute（SkipCachedTaskExecuter.java:106）位于org.gradle.api.internal.tasks.execution的org.gradle.api.internal.tasks.execution.ResolveBuildCacheKeyExecuter.execute（ResolveBuildCacheKeyExecuter.java:60）.tasks.execution.ResolveTaskOutputCachingStateExecuter.execute（ResolveTaskOutputCachingStateExecuter.java:54） . 在org.gradle.api.internal.tasks.exe . 执行（ValidatingTaskExecuter.java:58）org.gradle.api.internal.tasks.exe . 执行（SkipEmptySourceFilesTaskExecuter.java:88）org.gradle.api.internal.tasks.execution.ResolveTaskArtifac org.gradle.api.internal.tasks.exe . 执行（SkipTaskWithNoActionsExecuter.java:52）org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute中的tStateTaskExecuter.execute（ResolveTaskArtifactStateTaskExecuter.java:52） SkipOnlyIfTaskExecuter.java:54）org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute（ExecuteAtMostOnceTaskExecuter.java:43）at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute（CatchExceptionTaskExecuter.java： 34）在org.gradle上的org.gradle.execution.taskgraph.DefaultTaskGraphExecuter $ EventFiringTaskWorker $ 1.run（DefaultTaskGraphExecuter.java:248）org.gradle.internal.progress.DefaultBuildOperationExecutor $ RunnableBuildOperationWorker.execute（DefaultBuildOperationExecutor.java:336） . org.gradle.internal.progress.DefaultBuildOperationExecutor.execu中的internal.progress.DefaultBuildOperationExecutor $ RunnableBuildOperationWorker.execute（DefaultBuildOperationExecutor.java:328） org.gradle.internal.progress.DefaultBupeOperationExecutor.run（DefaultBuildOperationExecutor.java:107）中的org.gradle.execution.taskgraph.DefaultTaskGraphExecuter $ EventFiringTaskWorker.execute（DefaultTaskGraphExecuter.java:241）at org上的te（DefaultBuildOperationExecutor.java:197） .gradle.execution.taskgraph.DefaultTaskGraphExecuter $ EventFiringTaskWorker.execute（DefaultTaskGraphExecuter.java:230）org.gradle.execution.taskgraph.DefaultTaskPlanExecutor $ TaskExecutorWorker.processTask（DefaultTaskPlanExecutor.java:124）at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor $ TaskExecutorWorker.access $ 200（DefaultTaskPlanExecutor.java:80）org.gradle.execution.taskgraph.DefaultTaskPlanExecutor $ TaskExecutorWorker $ 1.execute（DefaultTaskPlanExecutor.java:105）at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor $ TaskExecutorWorker $ 1.execute（ DefaultTaskPlanExecutor.java:99）org.gradle.ex上的org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.execute（DefaultTaskExecutionPlan.java:625）在org.gradle.execution.taskgraph.DefaultTaskPlanExecutor $ TaskExecutorWorker.run（DefaultTaskPlanExecutor.java:99）的orcution.taskgraph.DefaultTaskExecutionPlan.executeWithTask（DefaultTaskExecutionPlan.java:580）org.gradle.internal.concurrent.ExecutorPolicy $ CatchAndRecordFailures.onExecute（ ExecutorPolicy.java:63）atg.gradle.internal.concurrent.ManagedExecutorImpl $ 1.run（ManagedExecutorImpl.java:46）at org.gradle.internal.concurrent.ThreadFactoryImpl $ ManagedThreadRunnable.run（ThreadFactoryImpl.java:55）引起： java.lang.NoClassDefFoundError：无法在com.google.api.server.spi.tools.EndpointsTool . （EndpointsTool.java:55）初始化com.google.api.server.spi.tools.GenClientLibAction类 . com.google.cloud.tools.gradle.endpoints.framework.server.task.GenerateDiscoveryDocsTask.generateDiscoveryDocs(GenerateDiscoveryDocsTask.java:137）org.gradle.internal.reflect.JavaMethod.invoke（JavaMethod.java:73）at org . gradle.api.internal.project.taskfactory.DefaultTaskClassInfoStore $ StandardTaskAction.doExecute（DefaultTaskClassInfoStore.java:141）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）位于org.gradle.api的org.gradle.api.internal.AbstractTask $ TaskActionWrapper.execute（AbstractTask.java:731） . internal.AbstractTask $ TaskActionWrapper.execute（AbstractTask.java:705）atg.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter $ 1.run（ExecuteActionsTaskExecuter.java:122）org.gradle.internal.progress.DefaultBuildOperationExecutor $ RunnableBuildOperation ord.gradle.internal.progress.DefaultBuildOperationExecutor.execute中的org.gradle.internal.progress.DefaultBuildOperationExecutor $ RunnableBuildOperationWorker.execute（DefaultBuildOperationExecutor.java:328）上的Worker.execute（DefaultBuildOperationExecutor.java:336）（DefaultBuildOperationExecutor.java:197） org.gradle.internal.progress.DefaultBuildOperationExecutor.run（DefaultBuildOperationExecutor.java:107）位于org.gradle.api.internal的org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction（ExecuteActionsTaskExecuter.java:111） .tasks.execution.ExecuteActionsTaskExecuter.executeActions（ExecuteActionsTaskExecuter.java:92）... 29更多
在Github项目中已经有一个open issue，但项目所有者没有反馈意见 .
我有几个项目停止因为这个问题，有人遇到这个，有任何想法如何解决这个错误？