部署後在谷歌應用引擎上運行servlet時出錯

-2

Uncaught exception from servlet 
java.lang.IllegalStateException: This feature is only available to backend instances. 
    at com.google.appengine.api.system.SystemServiceImpl.translateException(SystemServiceImpl.java:40) 
    at com.google.appengine.api.system.SystemServiceImpl.startBackgroundRequest(SystemServiceImpl.java:28) 
    at com.google.apphosting.runtime.ApiProxyImpl$BackgroundThreadFactory.newThread(ApiProxyImpl.java:1125) 
    at com.google.appengine.api.ThreadManager.createBackgroundThread(ThreadManager.java:88) 
    at newscrawler.crawlerServlet.doGet(crawlerServlet.java:22) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:617) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166) 
    at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:125) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
    at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
    at com.google.apphosting.utils.servlet.JdbcMySqlConnectionCleanupFilter.doFilter(JdbcMySqlConnectionCleanupFilter.java:57) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
    at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43) 
    at org.mortbay.jetty.servlet.ServletHandler$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.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:266) 
    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$RequestHandler.headerComplete(HttpConnection.java:923) 
    at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76) 
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) 
    at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:146) 
    at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:438) 
    at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:480) 
    at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:487) 
    at com.google.tracing.TraceContext.runInContext(TraceContext.java:774) 
    at com.google.tracing.TraceContext$DoInTraceContext.runInContext(TraceContext.java:751) 
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:342) 
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:334) 
    at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:484) 
    at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251) 
    at java.lang.Thread.run(Thread.java:679)

來源

2013-04-27 dab7

嗨，歡迎來到Stack Overflow。你剛剛拋棄了大量的堆棧跟蹤。這不是一個問題。你有產生這個痕跡的代碼嗎？ – Ben 2013-04-27 13:15:32

我有代碼是的，但我忘了發佈 – dab7 2013-04-27 15:30:24

您正試圖通過ThreadManager.createBackgroundThread()在前端實例上創建後臺線程。此方法只能通過在backend instances上運行的代碼調用。

請嘗試使用ThreadManager.createThreadForCurrentRequest()。此線程將與您的請求並行運行，但限制是它不能超過啓動它的請求。

來源

2013-04-27 14:12:46

謝謝@Peter Knego它真的幫助 – dab7 2013-04-27 15:31:01

部署後在谷歌應用引擎上運行servlet時出錯

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