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https://issues.apache.org/jira/browse/MYFACES-1838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12620266#action_12620266
 ] 

K. Ghadami commented on MYFACES-1838:
-------------------------------------

Thank you, I was ask to provide my full workaround for the patched version,
for the unpatched version it would be quite similar but don't hesitate to ask 
me:
 
The workaround with my ServletExceptionHandler  works fine in combination with 
the errorpage from my last preceding post.

//use for free but without warantie
public class ServletExceptionHandler {
        
        public void handle(PageContext context,String nicePage){
                Throwable ex = context.getErrorData().getThrowable();
                handle(context,ex, nicePage);
        }
        
        public void handle(PageContext context,Throwable ex,String nicePage){
                
        //try
                        
                        if (ex instanceof ViewExpiredException){
                                if (context.getResponse() instanceof 
HttpServletResponse )
                                {
                                        HttpServletResponse x = 
(HttpServletResponse) context.getResponse();
                                        
x.sendRedirect(context.getErrorData().getRequestURI());
                                        return;
                                }
                        }
       //...
       //lot of more code  but its not yet open source 
       // informe someone about the error
      //and forward the user to an jsf page to informe him too.
        }


> javax.crypto.BadPaddingException: Given final block not properly padded
> -----------------------------------------------------------------------
>
>                 Key: MYFACES-1838
>                 URL: https://issues.apache.org/jira/browse/MYFACES-1838
>             Project: MyFaces Core
>          Issue Type: Bug
>    Affects Versions: 1.2.2
>            Reporter: Guy Bashan
>         Attachments: MYFACES-1838.patch
>
>
> I keep getting this exception from time to time when moving between pages:
> javax.faces.FacesException: javax.crypto.BadPaddingException: Given final 
> block not properly padded
>       at 
> org.apache.myfaces.shared_impl.util.StateUtils.symmetric(StateUtils.java:373)
>       at 
> org.apache.myfaces.shared_impl.util.StateUtils.symmetric(StateUtils.java:411)
>       at 
> org.apache.myfaces.shared_impl.util.StateUtils.decrypt(StateUtils.java:291)
>       at 
> org.apache.myfaces.shared_impl.util.StateUtils.reconstruct(StateUtils.java:240)
>       at 
> org.apache.myfaces.renderkit.html.HtmlResponseStateManager.getSavedState(HtmlResponseStateManager.java:184)
>       at 
> org.apache.myfaces.renderkit.html.HtmlResponseStateManager.getState(HtmlResponseStateManager.java:136)
>       at 
> org.apache.myfaces.application.jsp.JspStateManagerImpl.restoreView(JspStateManagerImpl.java:289)
>       at 
> org.apache.myfaces.application.jsp.JspViewHandlerImpl.restoreView(JspViewHandlerImpl.java:505)
>       at 
> org.apache.myfaces.lifecycle.RestoreViewExecutor.execute(RestoreViewExecutor.java:85)
>       at 
> org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:103)
>       at 
> org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:76)
>       at javax.faces.webapp.FacesServlet.service(FacesServlet.java:148)
>       at 
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
>       at 
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
>       at 
> com.vdo.admin.model.persistence.OpenSessionInViewFilterIC.doFilterInternal(OpenSessionInViewFilterIC.java:155)
>       at 
> com.vdo.admin.model.persistence.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:61)
>       at 
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
>       at 
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
>       at 
> org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:147)
>       at 
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
>       at 
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
>       at 
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
>       at 
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
>       at 
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
>       at 
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
>       at 
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
>       at 
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
>       at 
> org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
>       at 
> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
>       at 
> org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
>       at java.lang.Thread.run(Thread.java:619)
> 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:369)
>       ... 30 more

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