[ 
https://issues.apache.org/jira/browse/MYFACES-2559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12842231#action_12842231
 ] 

Jakob Korherr commented on MYFACES-2559:
----------------------------------------

Got it too, it occurs when guessing the number right and hitting the back 
button:

javax.faces.FacesException: javax.crypto.BadPaddingException: Given final block 
not properly padded
        at 
org.apache.myfaces.context.ExceptionHandlerImpl.wrap(ExceptionHandlerImpl.java:241)
        at 
org.apache.myfaces.context.ExceptionHandlerImpl.handle(ExceptionHandlerImpl.java:156)
        at 
org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:157)
        at 
org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:88)
        at javax.faces.webapp.FacesServlet.service(FacesServlet.java:189)
        at 
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1093)
        at 
com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:97)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
        at 
com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
        at 
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
        at 
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
        at 
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
        at 
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
        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:238)
        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$RequestHandler.headerComplete(HttpConnection.java:830)
        at 
com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
        at 
com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:135)
        at 
com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java:235)
        at 
com.google.apphosting.base.RuntimePb$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:363)
        at com.google.net.rpc.impl.Server$2.run(Server.java:837)
        at 
com.google.tracing.LocalTraceSpanRunnable.run(LocalTraceSpanRunnable.java:56)
        at 
com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan(LocalTraceSpanBuilder.java:536)
        at com.google.net.rpc.impl.Server.startRpc(Server.java:792)
        at com.google.net.rpc.impl.Server.processRequest(Server.java:367)
        at 
com.google.net.rpc.impl.ServerConnection.messageReceived(ServerConnection.java:448)
        at 
com.google.net.rpc.impl.RpcConnection.parseMessages(RpcConnection.java:319)
        at 
com.google.net.rpc.impl.RpcConnection.dataReceived(RpcConnection.java:290)
        at com.google.net.async.Connection.handleReadEvent(Connection.java:474)
        at 
com.google.net.async.EventDispatcher.processNetworkEvents(EventDispatcher.java:774)
        at 
com.google.net.async.EventDispatcher.internalLoop(EventDispatcher.java:205)
        at com.google.net.async.EventDispatcher.loop(EventDispatcher.java:101)
        at 
com.google.net.rpc.RpcService.runUntilServerShutdown(RpcService.java:251)
        at 
com.google.apphosting.runtime.JavaRuntime$RpcRunnable.run(JavaRuntime.java:394)
        at java.lang.Thread.run(Unknown Source)
Caused by: javax.crypto.BadPaddingException: Given final block not properly 
padded
        at com.sun.crypto.provider.SunJCE_f.b(DashoA13*..)
        at com.sun.crypto.provider.SunJCE_f.b(DashoA13*..)
        at com.sun.crypto.provider.DESCipher.engineDoFinal(DashoA13*..)
        at javax.crypto.Cipher.doFinal(DashoA13*..)
        at 
org.apache.myfaces.shared_impl.util.StateUtils.symmetric(StateUtils.java:471)
        at 
org.apache.myfaces.shared_impl.util.StateUtils.symmetric(StateUtils.java:513)
        at 
org.apache.myfaces.shared_impl.util.StateUtils.decrypt(StateUtils.java:313)
        at 
org.apache.myfaces.shared_impl.util.StateUtils.reconstruct(StateUtils.java:262)
        at 
org.apache.myfaces.renderkit.html.HtmlResponseStateManager.getSavedState(HtmlResponseStateManager.java:213)
        at 
org.apache.myfaces.renderkit.html.HtmlResponseStateManager.getState(HtmlResponseStateManager.java:160)
        at 
org.apache.myfaces.application.jsp.JspStateManagerImpl.restoreView(JspStateManagerImpl.java:406)
        at 
org.apache.myfaces.shared_impl.view.ViewDeclarationLanguageBase.restoreView(ViewDeclarationLanguageBase.java:106)
        at 
org.apache.myfaces.application.ViewHandlerImpl.restoreView(ViewHandlerImpl.java:240)
        at 
com.sun.facelets.FaceletViewHandler.restoreView(FaceletViewHandler.java:318)
        at 
org.apache.myfaces.lifecycle.RestoreViewExecutor.execute(RestoreViewExecutor.java:109)
        at 
org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:138)
        ... 43 more


> Google App Engine Support for Myfaces 2
> ---------------------------------------
>
>                 Key: MYFACES-2559
>                 URL: https://issues.apache.org/jira/browse/MYFACES-2559
>             Project: MyFaces Core
>          Issue Type: Improvement
>          Components: JSR-314
>    Affects Versions: 2.0.0-beta
>         Environment: Google App Engine
>            Reporter: Ali Ok
>            Assignee: Matthias Weßendorf
>            Priority: Minor
>             Fix For: 2.0.0-beta-3
>
>         Attachments: 2559.patch
>
>
> Google App Engine Support for Myfaces 2

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