I am getting following exception while getting data from session. I
have following 2 servlets. One set session and other retrieve
attribute from it. I have also sett session enable tag in appengine
web xml file. (note: Using twitter4j)

[FIRST SERVLET]

 Twitter twitter = new Twitter();
                   twitter.setOAuthConsumer("<masked>", "<masked>");
                   RequestToken requestToken = null;
                try {
                        requestToken = twitter.getOAuthRequestToken();
                        log.info("OAuth token has been taken");
                } catch (TwitterException e) {
                        log.warning(e.toString());
                }

                HttpSession session = request.getSession();
                if (session.getAttribute("twitter")==null){
                        session.setAttribute("twitter", twitter);
                        out.println("-----------------------------> session is 
set");
                }

                if (session.getAttribute("token")==null){
                        session.setAttribute("token", requestToken);
                        out.println("-----------------------------> session is 
set");
                }
                String authUrl = requestToken.getAuthorizationURL();



[SECOND SERVLET]


                        HttpSession session = request.getSession();

                        twitter = (Twitter)session.getAttribute("twitter");
                        r  = (RequestToken)session.getAttribute("token");

                        twitter.setOAuthAccessToken(r.getAccessToken());

                        twitter.updateStatus("Hello World!");




#
09-22 01:34PM 12.913

EXCEPTION
javax.servlet.ServletException: java.lang.ArrayStoreException:
[Ljava.lang.String;
        at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle
(AppVersionHandlerMap.java:239)
        at org.mortbay.jetty.handler.HandlerWrapper.handle
(HandlerWrapper.java:139)
        at org.mortbay.jetty.Server.handle(Server.java:313)
        at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
506)
        at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete
(HttpConnection.java:830)
        at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable
(RpcRequestParser.java:76)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
        at
com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest
(JettyServletEngineAdapter.java:139)
        at com.google.apphosting.runtime.JavaRuntime.handleRequest
(JavaRuntime.java:235)
        at com.google.apphosting.base.RuntimePb$EvaluationRuntime
$6.handleBlockingRequest(RuntimePb.java:4950)
        at com.google.apphosting.base.RuntimePb$EvaluationRuntime
$6.handleBlockingRequest(RuntimePb.java:4948)
        at com.google.net.rpc.impl.BlockingApplicationHandler.handleRequest
(BlockingApplicationHandler.java:24)
        at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:
359)
        at com.google.net.rpc.impl.Server$2.run(Server.java:823)
        at com.google.tracing.LocalTraceSpanRunnable.run
(LocalTraceSpanRunnable.java:56)
        at com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan
(LocalTraceSpanBuilder.java:516)
        at com.google.net.rpc.impl.Server.startRpc(Server.java:778)
        at com.google.net.rpc.impl.Server.processRequest(Server.java:351)
        at com.google.net.rpc.impl.ServerConnection.messageReceived
(ServerConnection.java:437)
        at com.google.net.rpc.impl.RpcConnection.parseMessages
(RpcConnection.java:319)
        at com.google.net.rpc.impl.RpcConnection.dataReceived
(RpcConnection.java:290)
        at com.google.net.async.Connection.handleReadEvent(Connection.java:
428)
        at com.google.net.async.EventDispatcher.processNetworkEvents
(EventDispatcher.java:762)
        at com.google.net.async.EventDispatcher.internalLoop
(EventDispatcher.java:207)
        at com.google.net.async.EventDispatcher.loop(EventDispatcher.java:
101)
        at com.google.net.rpc.RpcService.runUntilServerShutdown
(RpcService.java:251)
        at com.google.apphosting.runtime.JavaRuntime$RpcRunnable.run
(JavaRuntime.java:392)
        at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ArrayStoreException: [Ljava.lang.String;
        at java.io.ObjectInputStream.readArray(Unknown Source)
        at java.io.ObjectInputStream.readObject0(Unknown Source)
        at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
        at java.io.ObjectInputStream.readSerialData(Unknown Source)
        at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
        at java.io.ObjectInputStream.readObject0(Unknown Source)
        at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
        at java.io.ObjectInputStream.defaultReadObject(Unknown Source)
        at java.text.SimpleDateFormat.readObject(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.invokeReadObject(Unknown Source)
        at java.io.ObjectInputStream.readSerialData(Unknown Source)
        at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
        at java.io.ObjectInputStream.readObject0(Unknown Source)
        at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
        at java.io.ObjectInputStream.readSerialData(Unknown Source)
        at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
        at java.io.ObjectInputStream.readObject0(Unknown Source)
        at java.io.ObjectInputStream.readObject(Unknown Source)
        at java.util.HashMap.readObject(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.invokeReadObject(Unknown Source)
        at java.io.ObjectInputStream.readSerialData(Unknown Source)
        at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
        at java.io.ObjectInputStream.readObject0(Unknown Source)
        at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
        at java.io.ObjectInputStream.readSerialData(Unknown Source)
        at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
        at java.io.ObjectInputStream.readObject0(Unknown Source)
        at java.io.ObjectInputStream.readObject(Unknown Source)
        at com.google.apphosting.runtime.jetty.SessionManager.deserialize
(SessionManager.java:385)
        at com.google.apphosting.runtime.jetty.SessionManager.loadSession
(SessionManager.java:307)
        at com.google.apphosting.runtime.jetty.SessionManager.getSession
(SessionManager.java:282)
        at org.mortbay.jetty.servlet.AbstractSessionManager.getHttpSession
(AbstractSessionManager.java:237)
        at org.mortbay.jetty.Request.getSession(Request.java:998)
        at org.mortbay.jetty.servlet.SessionHandler.handle
(SessionHandler.java:192)
        at org.mortbay.jetty.handler.ContextHandler.handle
(ContextHandler.java:712)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
405)
        at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle
(AppVersionHandlerMap.java:237)
        ... 27 more

#
W 09-22 01:34PM 12.920

Nested in javax.servlet.ServletException:
java.lang.ArrayStoreException: [Ljava.lang.String;:
java.lang.ArrayStoreException: [Ljava.lang.String;
        at java.io.ObjectInputStream.readArray(Unknown Source)
        at java.io.ObjectInputStream.readObject0(Unknown Source)
        at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
        at java.io.ObjectInputStream.readSerialData(Unknown Source)
        at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
        at java.io.ObjectInputStream.readObject0(Unknown Source)
        at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
        at java.io.ObjectInputStream.defaultReadObject(Unknown Source)
        at java.text.SimpleDateFormat.readObject(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.invokeReadObject(Unknown Source)
        at java.io.ObjectInputStream.readSerialData(Unknown Source)
        at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
        at java.io.ObjectInputStream.readObject0(Unknown Source)
        at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
        at java.io.ObjectInputStream.readSerialData(Unknown Source)
        at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
        at java.io.ObjectInputStream.readObject0(Unknown Source)
        at java.io.ObjectInputStream.readObject(Unknown Source)
        at java.util.HashMap.readObject(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.invokeReadObject(Unknown Source)
        at java.io.ObjectInputStream.readSerialData(Unknown Source)
        at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
        at java.io.ObjectInputStream.readObject0(Unknown Source)
        at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
        at java.io.ObjectInputStream.readSerialData(Unknown Source)
        at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
        at java.io.ObjectInputStream.readObject0(Unknown Source)
        at java.io.ObjectInputStream.readObject(Unknown Source)
        at com.google.apphosting.runtime.jetty.SessionManager.deserialize
(SessionManager.java:385)
        at com.google.apphosting.runtime.jetty.SessionManager.loadSession
(SessionManager.java:307)
        at com.google.apphosting.runtime.jetty.SessionManager.getSession
(SessionManager.java:282)
        at org.mortbay.jetty.servlet.AbstractSessionManager.getHttpSession
(AbstractSessionManager.java:237)
        at org.mortbay.jetty.Request.getSession(Request.java:998)
        at org.mortbay.jetty.servlet.SessionHandler.handle
(SessionHandler.java:192)
        at org.mortbay.jetty.handler.ContextHandler.handle
(ContextHandler.java:712)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
405)
        at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle
(AppVersionHandlerMap.java:237)
        at org.mortbay.jetty.handler.HandlerWrapper.handle
(HandlerWrapper.java:139)
        at org.mortbay.jetty.Server.handle(Server.java:313)
        at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
506)
        at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete
(HttpConnection.java:830)
        at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable
(RpcRequestParser.java:76)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
        at
com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest
(JettyServletEngineAdapter.java:139)
        at com.google.apphosting.runtime.JavaRuntime.handleRequest
(JavaRuntime.java:235)
        at com.google.apphosting.base.RuntimePb$EvaluationRuntime
$6.handleBlockingRequest(RuntimePb.java:4950)
        at com.google.apphosting.base.RuntimePb$EvaluationRuntime
$6.handleBlockingRequest(RuntimePb.java:4948)
        at com.google.net.rpc.impl.BlockingApplicationHandler.handleRequest
(BlockingApplicationHandler.java:24)
        at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:
359)
        at com.google.net.rpc.impl.Server$2.run(Server.java:823)
        at com.google.tracing.LocalTraceSpanRunnable.run
(LocalTraceSpanRunnable.java:56)
        at com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan
(LocalTraceSpanBuilder.java:516)
        at com.google.net.rpc.impl.Server.startRpc(Server.java:778)
        at com.google.net.rpc.impl.Server.processRequest(Server.java:351)
        at com.google.net.rpc.impl.ServerConnection.messageReceived
(ServerConnection.java:437)
        at com.google.net.rpc.impl.RpcConnection.parseMessages
(RpcConnection.java:319)
        at com.google.net.rpc.impl.RpcConnection.dataReceived
(RpcConnection.java:290)
        at com.google.net.async.Connection.handleReadEvent(Connection.java:
428)
        at com.google.net.async.EventDispatcher.processNetworkEvents
(EventDispatcher.java:762)
        at com.google.net.async.EventDispatcher.internalLoop
(EventDispatcher.java:207)
        at com.google.net.async.EventDispatcher.loop(EventDispatcher.java:
101)
        at com.google.net.rpc.RpcService.runUntilServerShutdown
(RpcService.java:251)
        at com.google.apphosting.runtime.JavaRuntime$RpcRunnable.run
(JavaRuntime.java:392)
        at java.lang.Thread.run(Un
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