API Explorer出错 - 无法检索状态为500的API配置

时间：2017-02-09 16:35:21

标签： google-app-engine objectify

我一直在使用GAE为我的Android应用程序构建后端，而我正在使用Endpoints API。到目前为止，我已经能够在开发服务器上成功部署后端。今天，突然之间我在部署后端时遇到了这个异常。我根本没有改变后端代码，只是完全在前端工作。以下是例外：

    "C:\Program Files\Java\jdk1.8.0_102\bin\java" -javaagent:C:\Users\Digvijay\.gradle\appengine-sdk\appengine-java-sdk-1.9.49\lib\agent\appengine-agent.jar -Xbootclasspath/p:C:\Users\Digvijay\.gradle\appengine-sdk\appengine-java-sdk-1.9.49\lib\override\appengine-dev-jdk-overrides.jar -Didea.launcher.port=7533 "-Didea.launcher.bin.path=C:\Program Files\Android\Android Studio\bin" -Dfile.encoding=windows-1252 -classpath "C:\Users\Digvijay\.gradle\appengine-sdk\appengine-java-sdk-1.9.49\lib\appengine-tools-api.jar;C:\Program Files\Android\Android Studio\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain com.google.appengine.tools.development.DevAppServerMain --address=localhost --port=8080 C:\Users\Digvijay\AndroidStudioProjects\LearnCity\backend\build\exploded-app
    Feb 09, 2017 9:51:16 PM java.util.prefs.WindowsPreferences <init>
    WARNING: Could not open/create prefs root node Software\JavaSoft\Prefs at root 0x80000002. Windows RegCreateKeyEx(...) returned error code 5.
    Feb 09, 2017 9:51:18 PM com.google.appengine.tools.development.SystemPropertiesManager setSystemProperties
    INFO: Overwriting system property key 'java.util.logging.config.file', value 'C:\Users\Digvijay\.gradle\appengine-sdk\appengine-java-sdk-1.9.49\config\sdk\logging.properties' with value 'WEB-INF/logging.properties' from 'C:\Users\Digvijay\AndroidStudioProjects\LearnCity\backend\build\exploded-app\WEB-INF\appengine-web.xml'
    Feb 09, 2017 9:51:18 PM com.google.apphosting.utils.jetty.JettyLogger info
    INFO: Logging to JettyLogger(null) via com.google.apphosting.utils.jetty.JettyLogger
    Feb 09, 2017 4:21:18 PM com.google.apphosting.utils.jetty.JettyLogger info
    INFO: jetty-6.1.x
    Feb 09, 2017 4:21:19 PM com.google.apphosting.utils.jetty.JettyLogger info
    INFO: Started SelectChannelConnector@localhost:8080
    Feb 09, 2017 4:21:19 PM com.google.appengine.tools.development.AbstractModule startup
    INFO: Module instance default is running at http://localhost:8080/
    Feb 09, 2017 4:21:19 PM com.google.appengine.tools.development.AbstractModule startup
    INFO: The admin console is running at http://localhost:8080/_ah/admin
    Feb 09, 2017 9:51:19 PM com.google.appengine.tools.development.DevAppServerImpl doStart
    INFO: Dev App Server is now running
    Feb 09, 2017 9:51:48 PM com.google.appengine.tools.development.LocalResourceFileServlet doGet
    WARNING: No file found for: /favicon.ico
    Feb 09, 2017 9:51:50 PM com.google.apphosting.utils.jetty.JettyLogger warn
    WARNING: Error for /_ah/spi/BackendService.getApiConfigs
    java.lang.StackOverflowError
        at java.lang.System.getProperty(System.java:714)
        at com.google.appengine.tools.development.agent.runtime.Runtime.checkRestricted(Runtime.java:62)
        at com.googlecode.objectify.impl.FieldProperty.<init>(FieldProperty.java:36)
        at com.googlecode.objectify.impl.translate.ClassPopulator.getDeclaredProperties(ClassPopulator.java:209)
        at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:84)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEmbeddedClassTranslator(ClassTranslatorFactory.java:75)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:50)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
        at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
        at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
        at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
        at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:49)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
        at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
        at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
        at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
        at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEmbeddedClassTranslator(ClassTranslatorFactory.java:75)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:50)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
        at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
        at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
        at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
        at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:49)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
        at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
        at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
        at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
        at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEmbeddedClassTranslator(ClassTranslatorFactory.java:75)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:50)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
        at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
        at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
        at 
  com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:49)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
        at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
        at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
        at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
        at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEmbeddedClassTranslator(ClassTranslatorFactory.java:75)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:50)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
        at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
        at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
        at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
        at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:49)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
        at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
        at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
        at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
        at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEmbeddedClassTranslator(ClassTranslatorFactory.java:75)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:50)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
        at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
        at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
        at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
        at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:49)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
        at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
        at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
        at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
        at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEmbeddedClassTranslator(ClassTranslatorFactory.java:75)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:50)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
        at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
        at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
        at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
        at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:49)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
        at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
        at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
        at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
        at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEmbeddedClassTranslator(ClassTranslatorFactory.java:75)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:50)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
        at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
        at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
        at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
        at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:49)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
        at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
        at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
        at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
        at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEmbeddedClassTranslator(ClassTranslatorFactory.java:75)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:50)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
        at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
        at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
        at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
        at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:49)
        at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
        at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)

    Feb 09, 2017 9:51:50 PM com.google.apphosting.utils.jetty.JettyLogger warn
    WARNING: /_ah/api/explorer: java.io.IOException: Failed to retrieve API configs with status: 500
    Feb 09, 2017 9:52:07 PM com.google.apphosting.utils.jetty.JettyLogger warn
    WARNING: /_ah/spi/BackendService.getApiConfigs
    java.lang.NullPointerException
        at com.google.api.server.spi.SystemServiceServlet.execute(SystemServiceServlet.java:100)
        at com.google.api.server.spi.SystemServiceServlet.doPost(SystemServiceServlet.java:71)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
        at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
        at com.googlecode.objectify.ObjectifyFilter.doFilter(ObjectifyFilter.java:48)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
        at com.google.appengine.api.socket.dev.DevSocketFilter.doFilter(DevSocketFilter.java:74)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
        at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:128)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
        at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
        at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:63)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
        at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:48)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
        at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
        at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectRequest(DevAppServerModulesFilter.java:366)
        at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectModuleRequest(DevAppServerModulesFilter.java:349)
        at com.google.appengine.tools.development.DevAppServerModulesFilter.doFilter(DevAppServerModulesFilter.java:116)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
        at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
        at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
        at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
        at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
        at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:95)
        at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
        at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:508)
        at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
        at org.mortbay.jetty.Server.handle(Server.java:326)
        at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
        at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
        at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
        at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)

    Feb 09, 2017 9:52:07 PM com.google.apphosting.utils.jetty.JettyLogger warn
    WARNING: /_ah/api/discovery/v1/apis/myApi/v1/rest: java.io.IOException: Failed to retrieve API configs with status: 500

    Process finished with exit code -1

有没有人对上述问题有任何线索？

1 个答案:

答案 0 :(得分：0)

我现在正在黑暗中拍摄几个小时的答案后发布答案。

第一条线索：异常跟踪显示Objectify的重复调用，并且@stickfigure要求我发布我试图坚持的实体，他的猜测是正确的 - 问题在于实体。

我不知道这是故意的还是偶然的，但是我现在要揭露的是Objectify的一个警告。我正在使用Objectify 5.1.14（最新版本），这也可能适用于旧版本。

显然，Objectify不允许2个引用交叉引用。例如，我有两个实体 Entity1 和 Entity2 ，如下所示：

@Entity
public class Entity1 {

    @Id
    private long id;
    private Entity2 entity2;
}

@Entity
public class Entity2 {

    @Id
    private long id;
    private Entity1 entity1;
}

如果你为它们（你自己或GAE插件）生成端点，后端将编译得很好并将被部署。但任何持久或访问API Explorer的尝试都会导致上述异常。

解决方案：显而易见的解决方案是没有交叉引用。还有另一种解决方案，但是如果您不在乎交叉引用没有被保留在数据存储区中 - 请使用@Ignore Objectify注释，如下所示：

@Entity
    public class Entity1 {

    @Id
    private long id;
    @Ignore
    private Entity2 entity2;
}

@Entity
public class Entity2 {

    @Id
    private long id;
    @Ignore
    private Entity1 entity1;
}

注意：任何一个实体只需要1个@Ignore即可。

您可以测试上述方案，并且会出现异常，如交叉引用中所述。

最后，我不确定，但基于搜索，问题似乎存在于发现文档的生成中。

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