Java 部署后在google app engine上运行servlet时出错
您正试图通过在前端实例上创建后台线程。此方法只能由上运行的代码调用Java 部署后在google app engine上运行servlet时出错,java,google-app-engine,Java,Google App Engine,您正试图通过在前端实例上创建后台线程。此方法只能由上运行的代码调用 相反,请尝试使用ThreadManager.createThreadForCurrentRequest()。此线程将与您的请求并行运行,但限制是它不能超过启动它的请求。您好,欢迎使用堆栈溢出。您刚刚转储了大量堆栈跟踪。这不是一个问题。你有生成此跟踪的代码吗?我有代码是的,但我忘了发布它了Hanks@Peter Knego它真的很有帮助 Uncaught exception from servlet java.lang.Illeg
相反,请尝试使用
ThreadManager.createThreadForCurrentRequest()
。此线程将与您的请求并行运行,但限制是它不能超过启动它的请求。您好,欢迎使用堆栈溢出。您刚刚转储了大量堆栈跟踪。这不是一个问题。你有生成此跟踪的代码吗?我有代码是的,但我忘了发布它了Hanks@Peter Knego它真的很有帮助
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)