Hi all,
When we migrate our website to the GAE ,occurred
NotSerializableException .I don't know how to deal with .Are there
official document about the "Serializable" about GAE/J .
Thanks in advance .Below is the stacks-trace .

java.lang.RuntimeException: java.io.NotSerializableException:
org.mortbay.jetty.Request
        at
com.google.apphosting.runtime.jetty.SessionManager.serialize(SessionManager.java:
393)
        at
com.google.apphosting.runtime.jetty.SessionManager.createEntityForSession(SessionManager.java:
370)
        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
$RequestHandler.headerComplete(HttpConnection.java:923)
        at
com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:
76)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
        at
com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:
135)
        at
com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java:
261)
        at com.google.apphosting.base.RuntimePb$EvaluationRuntime
$2.handleRequest(RuntimePb.java:9285)
        at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:
437)
        at com.google.net.rpc.impl.Server$RpcTask.runInContext(Server.java:
573)
        at com.google.tracing.TraceContext$TraceContextRunnable
$1.run(TraceContext.java:448)
        at com.google.tracing.TraceContext.runInContext(TraceContext.java:
688)
        at com.google.tracing.TraceContext
$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:
326)
        at com.google.tracing.TraceContext
$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:
318)
        at com.google.tracing.TraceContext
$TraceContextRunnable.run(TraceContext.java:446)
        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)
Caused by: java.io.NotSerializableException: org.mortbay.jetty.Request
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:
1173)
        at
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:
1526)
        at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:
1491)
        at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:
1409)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:
1167)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:
343)
        at java.util.HashMap.writeObject(HashMap.java:1018)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:
57)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
43)
        at java.lang.reflect.Method.invoke(Method.java:616)
        at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:
962)
        at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:
1478)
        at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:
1409)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:
1167)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:
343)
        at
com.google.apphosting.runtime.jetty.SessionManager.serialize(SessionManager.java:
390)
        ... 31 more

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