gradlew:appengineEnhance失败

Question

我使用Java创建一个移动后端Google App Engine用Android Studio.为了启动本地服务器公开我的API,我使用gradlew [module name]:appengineRun.

但是,当我去http://localhost:8080/_ah/api/explorer,并尝试使用API​​时,我收到以下错误:

apr 29, 2014 10:52:32 PM com.google.api.server.spi.SystemService invokeServiceMethod
SEVERE: The class "com.mthoresen.fest.backend.LocationBean" is not persistable. 
This means that it either hasnt been enhanced, or that the enhanced version of 
the file is not in the CLASSPATH (or is hidden by an unenhanced version), or the 
Meta-Data/annotations for the class are not found.

此外,这个过程永远不会结束 - 它被困在了 Building 88% > :[module name]:appengineRun

---

编辑

这个烂摊子是通过loosebazooka的答案来解决的,但appengineRun仍然会遇到同样的错误.

所以我尝试了gradlew [module name]:appengineEnhance,它给了我以下输出:

Relying on packaging to define the extension of the main artifact has been deprecated and is scheduled to be removed in Gradle 2.0
:backend:appengineDownloadSdk                                                        
:backend:compileJava UP-TO-DATE                                                  
:backend:appengineEnhance FAILED          

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':backend:appengineEnhance'.
> An error occurred enhancing DataNucleus classes.

* Try:         
Run with --stacktrace option to get the stack trace. Run with --info or --debug option  to get more log output.

BUILD FAILED   

--info什么也没给我什么,并且--debug是很多输出的方式.--stacktrace也没有真正的帮助:

* Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task     ':backend:appengineEnhance'.
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:69)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:46)
    at org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecutionAnalysisTaskExecuter.java:35)
    at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:64)
    at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:58)
    at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:42)
    at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52)
    at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:53)
    at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43)
    at org.gradle.api.internal.AbstractTask.executeWithoutThrowingTaskFailure(AbstractTask.java:289)
    at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.executeTask(AbstractTaskPlanExecutor.java:79)
    at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.processTask(AbstractTaskPlanExecutor.java:63)
    at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.run(AbstractTaskPlanExecutor.java:51)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor.process(DefaultTaskPlanExecutor.java:23)
    at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:86)
    at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:29)
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:61)
    at org.gradle.execution.DefaultBuildExecuter.access$200(DefaultBuildExecuter.java:23)
    at org.gradle.execution.DefaultBuildExecuter$2.proceed(DefaultBuildExecuter.java:67)
    at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:32)
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:61)
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:54)
    at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:166)
    at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:113)
    at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:81)
    at org.gradle.launcher.exec.InProcessBuildActionExecuter$DefaultBuildController.run(InProcessBuildActionExecuter.java:64)
    at org.gradle.launcher.cli.ExecuteBuildAction.run(ExecuteBuildAction.java:33)
    at org.gradle.launcher.cli.ExecuteBuildAction.run(ExecuteBuildAction.java:24)
    at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:35)
    at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:26)
    at org.gradle.launcher.cli.RunBuildAction.run(RunBuildAction.java:50)
    at org.gradle.internal.Actions$RunnableActionAdapter.execute(Actions.java:171)
    at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:201)
    at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:174)
    at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:170)
    at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:139)
    at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:33)
    at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:22)
    at org.gradle.launcher.Main.doAction(Main.java:46)
    at org.gradle.launcher.bootstrap.EntryPoint.run(EntryPoint.java:45)
    at org.gradle.launcher.Main.main(Main.java:37)
    at org.gradle.launcher.bootstrap.ProcessBootstrap.runNoExit(ProcessBootstrap.java:50)
    at org.gradle.launcher.bootstrap.ProcessBootstrap.run(ProcessBootstrap.java:32)
    at org.gradle.launcher.GradleMain.main(GradleMain.java:23)
    at org.gradle.wrapper.BootstrapMainStarter.start(BootstrapMainStarter.java:33)
    at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:130)
    at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:48)
Caused by: org.gradle.api.GradleException: An error occurred enhancing DataNucleus classes.
    at com.google.appengine.task.EnhanceTask.enhanceClasses(EnhanceTask.groovy:58)
    at com.google.appengine.task.EnhanceTask.executeTask(EnhanceTask.groovy:34)
    at com.google.appengine.task.AbstractTask.start(AbstractTask.groovy:38)
    at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:63)
    at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.doExecute(AnnotationProcessingTaskFactory.java:219)
    at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:212)
    at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:201)
    at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:533)
    at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:516)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:80)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:61)
    ... 46 more
Caused by: : Java returned: 1
    at org.apache.tools.ant.taskdefs.Java.execute(Java.java:111)
    at com.google.appengine.tools.enhancer.EnhancerTask.execute(EnhancerTask.java:97)
    at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
    at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
    at org.gradle.api.internal.project.ant.BasicAntBuilder.nodeCompleted(BasicAntBuilder.java:71)
    at org.gradle.api.internal.project.ant.BasicAntBuilder.doInvokeMethod(BasicAntBuilder.java:86)
    at org.gradle.api.internal.project.DefaultAntBuilder.super$3$invokeMethod(DefaultAntBuilder.groovy)
    at org.gradle.api.internal.project.DefaultAntBuilder.invokeMethod(DefaultAntBuilder.groovy:37)
    at com.google.appengine.task.EnhanceTask.enhanceClasses(EnhanceTask.groovy:42)
    ... 56 more

所有文件我可以从谷歌找到正在使用Eclipse与maven和ant,但Android Studio有一个Google App Engine插件,所以它是没有意义说,这是不支持的.

我要保存的java类:

import javax.jdo.annotations.IdGeneratorStrategy;
import javax.jdo.annotations.IdentityType;
import javax.jdo.annotations.Key;
import javax.jdo.annotations.PersistenceCapable;
import javax.jdo.annotations.Persistent;
import javax.jdo.annotations.PrimaryKey;

@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class LocationBean {

    @PrimaryKey
    @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
    private Key key;
    @Persistent
    private double lat;
    @Persistent
    private double lng;
    @Persistent
    private double rad;
    @Persistent
    private long endtime;

    /** Getters and setters */
}

挖掘输出--debug,我发现以下行:

Encountered a problem: Unexpected exception
Please see the logs [C:\Users\<username>\AppData\Local\Temp\enhance4980231719213251330.log] for further information.

所以我做了.这是日志文件:

java.lang.RuntimeException: Unexpected exception
at com.google.appengine.tools.enhancer.Enhancer.execute(Enhancer.java:76)
at com.google.appengine.tools.enhancer.Enhance.<init>(Enhance.java:71)
at com.google.appengine.tools.enhancer.Enhance.main(Enhance.java:51)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.appengine.tools.enhancer.Enhancer.execute(Enhancer.java:74)
... 2 more
Caused by: org.datanucleus.exceptions.NucleusException: Plugin (Bundle) "org.datanucleus.enhancer" is already registered. Ensure you dont have multiple JAR versions of the same plugin in the classpath. The URL "file:/C:/Users/Martin/.gradle/caches/modules-2/files-2.1/org.datanucleus/datanucleus-enhancer/3.1.1/b141c67d55cc19f14639f091b84e692e2198dc50/datanucleus-enhancer-3.1.1.jar" is already registered, and you are trying to register an identical plugin located at URL "file:/C:/Users/Martin/.gradle/appengine-sdk/appengine-java-sdk-1.9.3/lib/opt/tools/datanucleus/v1/datanucleus-enhancer-1.1.4.jar."
at org.datanucleus.plugin.NonManagedPluginRegistry.registerBundle(NonManagedPluginRegistry.java:541)
at org.datanucleus.plugin.NonManagedPluginRegistry.registerBundle(NonManagedPluginRegistry.java:395)
at org.datanucleus.plugin.NonManagedPluginRegistry.registerExtensions(NonManagedPluginRegistry.java:219)
at org.datanucleus.plugin.NonManagedPluginRegistry.registerExtensionPoints(NonManagedPluginRegistry.java:160)
at org.datanucleus.plugin.PluginManager.<init>(PluginManager.java:65)
at org.datanucleus.plugin.PluginManager.createPluginManager(PluginManager.java:427)
at org.datanucleus.NucleusContext.<init>(NucleusContext.java:224)
at org.datanucleus.NucleusContext.<init>(NucleusContext.java:204)
at org.datanucleus.enhancer.DataNucleusEnhancer.<init>(DataNucleusEnhancer.java:160)
at org.datanucleus.enhancer.DataNucleusEnhancer.main(DataNucleusEnhancer.java:1133)
... 7 more

有趣的是

Plugin (Bundle) "org.datanucleus.enhancer" is already registered. Ensure you dont have multiple JAR versions of the same plugin in the classpath. The URL 
"file:/C:/Users/<username>/.gradle/caches/modules-2/files-2.1/org.datanucleus/datanucleus-enhancer/3.1.1/b141c67d55cc19f14639f091b84e692e2198dc50/datanucleus-enhancer-3.1.1.jar" 
is already registered, and you are trying to register an identical plugin located at URL 
"file:/C:/Users/<username>/.gradle/appengine-sdk/appengine-java-sdk-1.9.3/lib/opt/tools/datanucleus/v1/datanucleus-enhancer-1.1.4.jar."

因此看起来存在两种截然不同的版本datanucleus-enhancer.不知何故,gradlew下载版本3.1.1(我已指定build.gradle),而该过程的一部分想要使用版本1.1.4.同样,我找不到任何有关如何更改此内容的资源,因为Web上的每个教程都使用Maven.

Answer 1

更新:

这个答案有点过时了,如果你使用gradle-appengine-plugin 1.9.5或更高版本,你应该使用新的配置

appengine {
  enhancer {
    version = "v2"
    enhanceOnBuild = true
  }
}

而不是下面的内容.

原答案:

您可能需要配置增强器以使用增强器的v2.

在build.gradle文件中

appengine {
  enhancerVersion = "v2"
}

[编辑]在创建战争之前自动增强运行

在build.gradle文件中

war.dependsOn appengineEnhance