Same problem here with sessions. 100% reproducible.
Please star issue.

http://code.google.com/p/googleappengine/issues/detail?id=4224

On Aug 10, 7:48 am, Yoshihito Yamanaka <[email protected]> wrote:
> No, but other pages are using session.
> (Maybe 500 error page is using session. so this exception happend.)
> OK. I understood that don't use the session at Google App Engine as
> much as possible.
> If I use session, this exception will happen.
> I think the way I don't use session.
>
> If you know the way I continue to use session, please tell me.
> Thank you.
>
> On 7月29日, 午後11:48, "Ikai Lan (Google)" <[email protected]> wrote:
>
>
>
>
>
>
>
> > Any chance you're using sessions here?
>
> > --
> > Ikai Lan
> > Developer Programs Engineer, Google App Engine
> > plus.ikailan.com | twitter.com/ikai
>
> > On Thu, Jul 28, 2011 at 8:06 AM, Yoshihito Yamanaka 
> > <[email protected]>wrote:
>
> > > Hi,
>
> > > I found MemcacheServiceException at 2011/07/28 10:57 AM(PDT).
> > > What is this exception?
> > > I didn't write 1MB over data.
> > > And I could not found my class code line in stack trace.
> > > google app engine bug?
>
> > > In Addition, three thousand task queues retried after this exception
> > > is happened.
> > > Normally task queue retry after exception happen in task queue.
> > > But many task queues were running.
> > > Because of I received many error mail and mail quotas was over.
>
> > > Please help us.
> > > Thank you.
>
> > > stack trace:
> > > org.apache.jasper.runtime.JspFactoryImpl internalGetPageContext:
> > > Exception initializing page context
> > >com.google.appengine.api.memcache.MemcacheServiceException: Memcache
> > > put: Error setting single item (_ahsxvOfW0bieFkW1N2vYQoYnA)
> > >        at
>
> > > com.google.appengine.api.memcache.MemcacheServiceImpl.doPut(MemcacheServiceImpl.java:
> > > 427)
> > >        at
>
> > > com.google.appengine.api.memcache.MemcacheServiceImpl.put(MemcacheServiceImpl.java:
> > > 443)
> > >        at
>
> > > com.google.appengine.api.memcache.MemcacheServiceImpl.put(MemcacheServiceImpl.java:
> > > 470)
> > >        at
>
> > > com.google.apphosting.runtime.jetty.MemcacheSessionStore.saveSession(MemcacheSessionStore.java:
> > > 39)
> > >        at
>
> > > com.google.apphosting.runtime.jetty.SessionManager.createSession(SessionManager.java:
> > > 342)
> > >        at com.google.apphosting.runtime.jetty.SessionManager
> > > $AppEngineSession.<init>(SessionManager.java:125)
> > >        at
>
> > > com.google.apphosting.runtime.jetty.SessionManager.newSession(SessionManager.java:
> > > 273)
> > >        at
>
> > > com.google.apphosting.runtime.jetty.SessionManager.newSession(SessionManager.java:
> > > 43)
> > >        at
>
> > > org.mortbay.jetty.servlet.AbstractSessionManager.newHttpSession(AbstractSessionManager.java:
> > > 413)
> > >        at org.mortbay.jetty.Request.getSession(Request.java:1242)
> > >        at org.mortbay.jetty.Request.getSession(Request.java:1214)
> > >        at
> > > org.apache.jasper.runtime.PageContextImpl._initialize(PageContextImpl.java:
> > > 146)
> > >        at
> > > org.apache.jasper.runtime.PageContextImpl.initialize(PageContextImpl.java:
> > > 124)
> > >        at
>
> > > org.apache.jasper.runtime.JspFactoryImpl.internalGetPageContext(JspFactoryImpl.java:
> > > 107)
> > >        at org.apache.jasper.runtime.JspFactoryImpl.access
> > > $000(JspFactoryImpl.java:40)
> > >        at org.apache.jasper.runtime.JspFactoryImpl
> > > $PrivilegedGetPageContext.run(JspFactoryImpl.java:149)
> > >        at
>
> > > com.google.apphosting.runtime.security.shared.intercept.java.security.AccessController_.doPrivileged(AccessController_.java:
> > > 34)
> > >        at
>
> > > org.apache.jasper.runtime.JspFactoryImpl.getPageContext(JspFactoryImpl.java:
> > > 61)
> > >        at org.apache.jsp.error._500_jsp._jspService(_500_jsp.java:44)
> > >        at
> > > org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
> > >        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.handle(ServletHandler.java:
> > > 390)
> > >        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 
> > > org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:327)
> > >        at org.mortbay.jetty.servlet.Dispatcher.error(Dispatcher.java:135)
> > >        at com.google.apphosting.runtime.jetty.AppVersionHandlerMap
> > > $NullErrorHandler.mayHandleByErrorPage(AppVersionHandlerMap.java:403)
> > >        at com.google.apphosting.runtime.jetty.AppVersionHandlerMap
> > > $NullErrorHandler.handle(AppVersionHandlerMap.java:335)
> > >        at org.mortbay.jetty.Response.sendError(Response.java:274)
> > >        at
> > > org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:
> > > 475)
> > >        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:
> > > 249)
> > >        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
> > > $RequestHandler.headerComplete(HttpConnection.java:923)
> > >        at
>
> > > com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:
> > > 76)
> > >        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
> > >        at
>
> > > com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:
> > > 135)
> > >        at
> > > com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java:
> > > 260)
> > >        at com.google.apphosting.base.RuntimePb$EvaluationRuntime
> > > $2.handleRequest(RuntimePb.java:9805)
> > >        at 
> > > com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:
> > > 422)
> > >        at com.google.net.rpc.impl.Server$RpcTask.runInContext(Server.java:
> > > 579)
> > >        at com.google.tracing.TraceContext$TraceContextRunnable
> > > $1.run(TraceContext.java:449)
> > >        at com.google.tracing.TraceContext.runInContext(TraceContext.java:
> > > 689)
> > >        at com.google.tracing.TraceContext
>
> > > $AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:
> > > 327)
> > >        at com.google.tracing.TraceContext
> > > $AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:
> > > 319)
> > >        at com.google.tracing.TraceContext
> > > $TraceContextRunnable.run(TraceContext.java:447)
> > >        at
> > > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:
> > > 1110)
> > >        at java.util.concurrent.ThreadPoolExecutor
> > > $Worker.run(ThreadPoolExecutor.java:603)
> > >        at java.lang.Thread.run(Thread.java:636)
>
> > > --
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