The application has Wicket/JPA/Spring. It works locally on
dev_appserver. After I deploy it on GAE it fails with the following
track trace. I am failing to understand what might be the cause of the
error.

java.lang.RuntimeException: java.io.NotSerializableException:
org.datanucleus.store.appengine.query.DatastoreQuery$2
        at
com.google.apphosting.runtime.jetty.SessionManager.serialize(SessionManager.java:
387)
        at
com.google.apphosting.runtime.jetty.SessionManager.createEntityForSession(SessionManager.java:
364)
        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:
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
$RequestHandler.headerComplete(HttpConnection.java:923)
        at
com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:
76)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
        at
com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:
135)
        at
com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java:
251)
        at com.google.apphosting.base.RuntimePb$EvaluationRuntime
$6.handleBlockingRequest(RuntimePb.java:6784)

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