Hi
I got DatastoreTimeoutException when I using HttpSession at production
mode. This code does not create error at local development
environment.
Purpose to use session is cashing userID(google e-mail string ) when
user login at first time. So I created Session_User class which have
SeesionID, UserID, and UserNickName propaty and store this instance to
memcashe(Key:SessionID. Value Session Instance) and use memcash to
identify user when they access server 2nd time.
I am not using HttpSession.setAttribute method because I can use
Google userService.getCurrentUser() method when cashed data is
expired.
It is written that when we add <sessions-enabled>true</sessions-
enabled> to appengine-web.xml then GoogleSDK automatically creates
datastore entities of the kind _ah_SESSION but I could not find
_ah_SESSION class in my source code.
So Is this the reason for this DatastoreTimeoutException?
And if so what should I do to make GoogleSDK creates datastore
entities _ah_SESSION?
<<<<<<<Error List at production mode >>>>>>
A server error has occurred.
Uncaught exception from servlet
com.google.appengine.api.datastore.DatastoreTimeoutException: Unknown
at
com.google.appengine.api.datastore.DatastoreApiHelper.translateError
(DatastoreApiHelper.java:38)
at com.google.appengine.api.datastore.DatastoreApiHelper.makeSyncCall
(DatastoreApiHelper.java:56)
at com.google.appengine.api.datastore.DatastoreServiceImpl$2.run
(DatastoreServiceImpl.java:170)
at
com.google.appengine.api.datastore.TransactionRunner.runInTransaction
(TransactionRunner.java:30)
at com.google.appengine.api.datastore.DatastoreServiceImpl.put
(DatastoreServiceImpl.java:158)
at com.google.appengine.api.datastore.DatastoreServiceImpl.put
(DatastoreServiceImpl.java:138)
at com.google.appengine.api.datastore.DatastoreServiceImpl.put
(DatastoreServiceImpl.java:130)
at com.google.apphosting.runtime.jetty.SessionManager.createSession
(SessionManager.java:333)
at com.google.apphosting.runtime.jetty.SessionManager
$AppEngineSession.<init>(SessionManager.java:135)
at com.google.apphosting.runtime.jetty.SessionManager.newSession
(SessionManager.java:265)
at com.google.apphosting.runtime.jetty.SessionManager.newSession
(SessionManager.java:50)
at org.mortbay.jetty.servlet.AbstractSessionManager.newHttpSession
(AbstractSessionManager.java:413)
at org.mortbay.jetty.Request.getSession(Request.java:1005)
at askerDB.S_GoogleLogin.doPost(S_GoogleLogin.java:57)
at askerDB.S_GoogleLogin.doGet(S_GoogleLogin.java:102)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:693)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
487)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1093)
at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter
(SaveSessionFilter.java:35)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter
(TransactionCleanupFilter.java:43)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
at org.mortbay.jetty.servlet.ServletHandler.handle
(ServletHandler.java:360)
at org.mortbay.jetty.security.SecurityHandler.handle
(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle
(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle
(ContextHandler.java:712)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
405)
at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle
(AppVersionHandlerMap.java:237)
at org.mortbay.jetty.handler.HandlerWrapper.handle
(HandlerWrapper.java:139)
at org.mortbay.jetty.Server.handle(Server.java:313)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
506)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete
(HttpConnection.java:830)
at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable
(RpcRequestParser.java:76)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
at
com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest
(JettyServletEngineAdapter.java:139)
at com.google.apphosting.runtime.JavaRuntime.handleRequest
(JavaRuntime.java:235)
at com.google.apphosting.base.RuntimePb$EvaluationRuntime
$6.handleBlockingRequest(RuntimePb.java:4950)
at com.google.apphosting.base.RuntimePb$EvaluationRuntime
$6.handleBlockingRequest(RuntimePb.java:4948)
at com.google.net.rpc.impl.BlockingApplicationHandler.handleRequest
(BlockingApplicationHandler.java:24)
at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:
359)
at com.google.net.rpc.impl.Server$2.run(Server.java:823)
at com.google.tracing.LocalTraceSpanRunnable.run
(LocalTraceSpanRunnable.java:56)
at com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan
(LocalTraceSpanBuilder.java:516)
at com.google.net.rpc.impl.Server.startRpc(Server.java:778)
at com.google.net.rpc.impl.Server.processRequest(Server.java:351)
at com.google.net.rpc.impl.ServerConnection.messageReceived
(ServerConnection.java:437)
at com.google.net.rpc.impl.RpcConnection.parseMessages
(RpcConnection.java:319)
at com.google.net.rpc.impl.RpcConnection.dataReceived
(RpcConnection.java:290)
at com.google.net.async.Connection.handleReadEvent(Connection.java:
428)
at com.google.net.async.EventDispatcher.processNetworkEvents
(EventDispatcher.java:762)
at com.google.net.async.EventDispatcher.internalLoop
(EventDispatcher.java:207)
at com.google.net.async.EventDispatcher.loop(EventDispatcher.java:
101)
at com.google.net.rpc.RpcService.runUntilServerShutdown
(RpcService.java:251)
at com.google.apphosting.runtime.JavaRuntime$RpcRunnable.run
(JavaRuntime.java:392)
at java.lang.Thread.run(Unknown Source)
Unexpected exception from servlet:
com.google.appengine.api.datastore.DatastoreTimeoutException: Unknown
<<<<<<<Login Servlet code >>>>>>
public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws IOException
{
HttpSession session;
UserService userService = UserServiceFactory.getUserService();
User user = userService.getCurrentUser();
if (user == null)
{
resp.sendRedirect(userService.createLoginURL(req.getRequestURI()));
}
else
{
req.getSession(true).invalidate();
session = req.getSession(true);
Session_User SessionUser=new Session_User();
SessionUser.setSessionID(session.getId());
SessionUser.setUserID(user.getEmail());
SessionUser.setNick(user.getNickname());
AppCash.SessionUser_Put(SessionUser);
}
}
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