Works fine on App Engine locally but get (session-related?) error after deploying to production

[Charles Falconer]

I made the necessary changes to appengine-web.xml to get Sitebricks to run in development mode:

	<sessions-enabled>true</sessions-enabled>

	
	<system-properties>
        	<property name="java.util.logging.config.file" value="WEB-INF/logging.properties"/>
	        <property name="mvel2.disable.jit" value="true"/>

	</system-properties>

But after I deploy to the production site, I get this error (looks session-related but I'm not sure how exactly):


/
java.lang.RuntimeException: java.io.NotSerializableException: com.google.sitebricks.binding.HttpSessionFlashCache
	at com.google.apphosting.runtime.jetty.SessionManager.serialize(SessionManager.java:361)

	at com.google.apphosting.runtime.jetty.SessionManager.createEntityForSession(SessionManager.java:341)
	at com.google.apphosting.runtime.jetty.SessionManager$AppEngineSession.save(SessionManager.java:162)
	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:238)

	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:243)
	at com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:5485)
	at com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:5483)

	at com.google.net.rpc.impl.BlockingApplicationHandler.handleRequest(BlockingApplicationHandler.java:24)
	at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:398)
	at com.google.net.rpc.impl.Server$2.run(Server.java:852)

	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:807)

	at com.google.net.rpc.impl.Server.processRequest(Server.java:369)
	at com.google.net.rpc.impl.ServerConnection.messageReceived(ServerConnection.java:442)
	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:474)
	at com.google.net.async.EventDispatcher.processNetworkEvents(EventDispatcher.java:831)

	at com.google.net.async.EventDispatcher.internalLoop(EventDispatcher.java:207)
	at com.google.net.async.EventDispatcher.loop(EventDispatcher.java:103)
	at com.google.net.rpc.RpcService.runUntilServerShutdown(RpcService.java:251)

	at com.google.apphosting.runtime.JavaRuntime$RpcRunnable.run(JavaRuntime.java:404)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.io.NotSerializableException: com.google.sitebricks.binding.HttpSessionFlashCache

	at java.io.ObjectOutputStream.writeObject0(Unknown Source)
	at java.io.ObjectOutputStream.writeObject(Unknown Source)
	at java.util.HashMap.writeObject(Unknown Source)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)

	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
	at java.io.ObjectOutputStream.writeObject0(Unknown Source)
	at java.io.ObjectOutputStream.writeObject(Unknown Source)

	at com.google.apphosting.runtime.jetty.SessionManager.serialize(SessionManager.java:358)
	... 39 more


Any ideas?

[Charles Falconer]

I should have mentioned that the app in question is simply the "Getting Started" example that prints "Hello".

[Dhanji R. Prasanna]

Doh, this is unfortunate. We had a GaeFlashCache built specifically for appengine.

Try doing:

bind(FlashCache.class).to(GaeFlashCache.class).in(Singleton.class);

And see if that helps things =)

Dhanji.

[Charles Falconer]

That worked. Thank you, Dhanji.

Now that you mention it, I see that this binding is already present in GaeModule.java but doesn't seem to have been sufficient:

http://code.google.com/p/google-sitebricks/source/browse/trunk/sitebricks/src/main/java/com/google/sitebricks/GaeModule.java

[Dhanji R. Prasanna]

Yea Im not sure what's wrong there. Need a solid day to debug all the appengine problems on hosted and local. =(

If you can identify what's wrong that'd be great too!

Dhanji.