Java Web App over App Engine 错误访问

Question

我正在使用 Google App Engine 开发一个 Java Web 应用程序，该应用程序使用 Maven、JSF 和 Objectify，并且在 devserver 中运行良好，但在生产中出现以下错误：

com.sun.faces.config.ConfigureListener contextInitialized: Critical error during deployment: 
  java.security.AccessControlException: access denied ("java.lang.RuntimePermission" "modifyThreadGroup")
    at java.security.AccessControlContext.checkPermission(AccessControlContext.java:375)
    at java.security.AccessController.checkPermission(AccessController.java:565)
    at java.lang.SecurityManager.checkPermission(SecurityManager.java:549)
    at com.google.apphosting.runtime.security.CustomSecurityManager.checkPermission(CustomSecurityManager.java:56)
    at com.google.apphosting.runtime.security.CustomSecurityManager.checkAccess(CustomSecurityManager.java:131)
    at java.lang.ThreadGroup.checkAccess(ThreadGroup.java:315)
    at java.lang.Thread.init(Thread.java:378)
    at java.lang.Thread.<init>(Thread.java:575)
    at com.sun.faces.util.MojarraThreadFactory.newThread(MojarraThreadFactory.java:74)
    at java.util.concurrent.ThreadPoolExecutor$Worker.<init>(ThreadPoolExecutor.java:599)
    at java.util.concurrent.ThreadPoolExecutor.addWorker(ThreadPoolExecutor.java:931)
    at java.util.concurrent.ThreadPoolExecutor.ensurePrestart(ThreadPoolExecutor.java:1611)
    at java.util.concurrent.ScheduledThreadPoolExecutor.delayedExecute(ScheduledThreadPoolExecutor.java:305)
    at java.util.concurrent.ScheduledThreadPoolExecutor.scheduleAtFixedRate(ScheduledThreadPoolExecutor.java:542)
    at com.sun.faces.config.ConfigureListener.initConfigMonitoring(ConfigureListener.java:480)
    at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:227)
    at org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java:548)
    at org.mortbay.jetty.servlet.Context.startContext(Context.java:136)
    at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250)
    at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517)
    at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.createHandler(AppVersionHandlerMap.java:199)
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.getHandler(AppVersionHandlerMap.java:174)
    at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:134)
    at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:484)
    at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:438)
    at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:445)
    at com.google.tracing.CurrentContext.runInContext(CurrentContext.java:220)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:309)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:301)
    at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:442)
    at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251)
    at java.lang.Thread.run(Thread.java:724)

有人遇到过类似的问题，可以帮助我提示或者知道解决方案吗？

Answer 1

这已被问过很多次，请参阅以下问题以获取示例：

某些线程操作 are disallowed in App Engine，您的部分代码违反了规则。

Answer 2

像 Adam 指出的那样 Google App Engine 有一些限制，尤其是对于本机线程，如下所述：
https://cloud.google.com/appengine/docs/java/#threads
在 JSF 中，Google App Engine 使用的单线程环境的解决方案描述如下：
http://java.wildstartech.com/Java-Platform-Enterprise-Edition/JavaServer-Faces/javaserver-faces-20/configuring-javaserver-faces-20-to-run-on-the-google-appengine/javaserverfaces-20-and-google-app-engine-compatibility-issues
此外，处理 JSF 会话可能存在另一个问题，此处描述了一个可能的解决方案： Session lost in Google App Engine using JSF

最后，这里描述了 App Engine 中 JSF 的一个很好的详细示例： http://java.wildstartech.com/Java-Platform-Enterprise-Edition/JavaServer-Faces/javaserver-faces-22/configuring-jsf-22-to-run-on-the-google-app-engine-using-eclipse

Java Web App over App Engine 错误访问

Java Web App over App Engine error access

java

google-app-engine

maven

objectify