When using sessions, these are (also) stored in memcache by GAE. Unfortunately, it seems like any memcache hiccup can crash the process, turning an otherwise fine page into a 500 page on the way out.
To me that looks like a design flaw. After all, Memcache is optional, and its expected to be unavailable or breaking every now and then. As of 1.6 you can even provide a policy to silently ignore memcache errors inside your application. We're using setErrorHandler(ErrorHandlers.getConsistentLogAndContinue(Level.SEVERE)) with Objectify just fine, but it doesn't seem to have any effect on the Session-Save process. This seems to be entirely outside our control. These errors are really annoying some of our clients. Is there maybe some kind of other error handler I'm missing? Here's the stracktrace for reference: com.google.appengine.api.memcache.MemcacheServiceException: Memcache put: Error setting single item (_ahsOH7nik8bCRTbIXblKurKQQ) at com.google.appengine.api.memcache.AsyncMemcacheServiceImpl$7.transform(AsyncMemcacheServiceImpl.java:426) at com.google.appengine.api.memcache.AsyncMemcacheServiceImpl$7.transform(AsyncMemcacheServiceImpl.java:418) at com.google.appengine.api.memcache.MemcacheServiceApiHelper$RpcResponseHandler.convertResponse(MemcacheServiceApiHelper.java:60) at com.google.appengine.api.memcache.MemcacheServiceApiHelper$1.wrap(MemcacheServiceApiHelper.java:112) at com.google.appengine.api.memcache.MemcacheServiceApiHelper$1.wrap(MemcacheServiceApiHelper.java:105) at com.google.appengine.api.utils.FutureWrapper.wrapAndCache(FutureWrapper.java:57) at com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:98) at com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:90) at com.google.appengine.api.memcache.MemcacheServiceImpl.quietGet(MemcacheServiceImpl.java:28) at com.google.appengine.api.memcache.MemcacheServiceImpl.put(MemcacheServiceImpl.java:81) at com.google.apphosting.runtime.jetty.MemcacheSessionStore.saveSession(MemcacheSessionStore.java:39) at com.google.apphosting.runtime.jetty.SessionManager$AppEngineSession.save(SessionManager.java:164) at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:41) 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: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$RequestHandler.headerComplete(HttpConnection.java:923) at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76) at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:135) at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:477) at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:449) at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:455) at com.google.tracing.TraceContext.runInContext(TraceContext.java:695) at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:333) at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:325) at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:453) at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251) at java.lang.Thread.run(Thread.java:679) And here's the code I tried, but which didn't help: MemcacheService service = MemcacheServiceFactory.getMemcacheService(); service.setErrorHandler(new LogAndContinueErrorHandler(Level.SEVERE)); Any help would be appreciated! Kind regards, Per -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To view this discussion on the web visit https://groups.google.com/d/msg/google-appengine/-/0OKQJv8QomMJ. To post to this group, send email to google-appengine@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.