Hi,

I am developing small application for GAE using Springframework (3.0
RC1). I am using controller with session form attribute. It was
working perfectly before 1.3.0 SDK release. Now I'm getting errors
that form was not found on session.

I verified that form implements Serializable. I have sessions enabled
in appengine config file.
I attached stacktrace below.

The strangest thing is that this code was working few weeks ago... :(
Any ideas what can cause this?

Thanks
Konrad

ST:

/product/add.htm
org.springframework.web.HttpSessionRequiredException: Session
attribute 'productForm' required - not found in session
        at
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter
$ServletHandlerMethodInvoker.raiseSessionRequiredException
(AnnotationMethodHandlerAdapter.java:612)
        at
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.resolveModelAttribute
(HandlerMethodInvoker.java:599)
        at
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.resolveHandlerArguments
(HandlerMethodInvoker.java:285)
        at
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod
(HandlerMethodInvoker.java:156)
        at
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod
(AnnotationMethodHandlerAdapter.java:378)
        at
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle
(AnnotationMethodHandlerAdapter.java:366)
        at org.springframework.web.servlet.DispatcherServlet.doDispatch
(DispatcherServlet.java:781)
        at org.springframework.web.servlet.DispatcherServlet.doService
(DispatcherServlet.java:726)
        at org.springframework.web.servlet.FrameworkServlet.processRequest
(FrameworkServlet.java:636)
        at org.springframework.web.servlet.FrameworkServlet.doPost
(FrameworkServlet.java:556)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
        at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
487)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1093)
        at com.myapp.tools.CharsetFilter.doFilter(CharsetFilter.java:21)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
        at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter
(ParseBlobUploadFilter.java:97)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
        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:238)
        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$RequestHandler.headerComplete
(HttpConnection.java:830)
        at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable
(RpcRequestParser.java:76)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
        at
com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest
(JettyServletEngineAdapter.java:135)
        at com.google.apphosting.runtime.JavaRuntime.handleRequest
(JavaRuntime.java:235)
        at com.google.apphosting.base.RuntimePb$EvaluationRuntime
$6.handleBlockingRequest(RuntimePb.java:5235)
        at com.google.apphosting.base.RuntimePb$EvaluationRuntime
$6.handleBlockingRequest(RuntimePb.java:5233)
        at com.google.net.rpc.impl.BlockingApplicationHandler.handleRequest
(BlockingApplicationHandler.java:24)
        at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:
363)
        at com.google.net.rpc.impl.Server$2.run(Server.java:838)
        at com.google.tracing.LocalTraceSpanRunnable.run
(LocalTraceSpanRunnable.java:56)
        at com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan
(LocalTraceSpanBuilder.java:536)
        at com.google.net.rpc.impl.Server.startRpc(Server.java:793)
        at com.google.net.rpc.impl.Server.processRequest(Server.java:368)
        at com.google.net.rpc.impl.ServerConnection.messageReceived
(ServerConnection.java:448)
        at com.google.net.rpc.impl.RpcConnection.parseMessages
(RpcConnection.java:319)
        at com.google.net.rpc.impl.RpcConnection.dataReceived
(RpcConnection.java:290)
        at com.google.net.async.Connection.handleReadEvent(Connection.java:
466)
        at com.google.net.async.EventDispatcher.processNetworkEvents
(EventDispatcher.java:759)
        at com.google.net.async.EventDispatcher.internalLoop
(EventDispatcher.java:205)
        at com.google.net.async.EventDispatcher.loop(EventDispatcher.java:
101)
        at com.google.net.rpc.RpcService.runUntilServerShutdown
(RpcService.java:251)
        at com.google.apphosting.runtime.JavaRuntime$RpcRunnable.run
(JavaRuntime.java:394)
        at java.lang.Thread.run(Unknown Source)

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