Jsf Error : java.lang.ClassCastException

问题:

i am using jsf 2.0 on glassfish 3.0.1 to build an interface to my search engine , when i used Openfaces components on my jsf page and whenever i submit a form i get this error message :

java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to com.sun.faces.application.view.StateHolderSaver

i didnt find any help on the web , please what is the problem ? and how to get rid of it ?

thanks.

回答1:

This is known as JSF issue 1427. Partial state saving may fail when ajax requests are fired on a page which is been opened by a JSF POST navigation case. There are three solutions, in recommended order:

1. Do not use POST for page-to-page navigation. So replace <h:commandLink> by <h:link> or <h:outputLink>. See also h:outputLink vs h:commandLink.

2. Implement POST-Redirect-GET pattern. So if you're still using old fashioned <navigation-case> in faces-config.xml, then add <redirect/> entry. Or if you're using implicit navigation outcomes, then add ?faces-redirect=true query string to the outcome.

3. Configure the problematic pages to utilize full state saving.

   <context-param>
       <param-name>javax.faces.FULL_STATE_SAVING_VIEW_IDS</param-name>
       <param-value>/pagename.xhtml</param-value>
   </context-param>
   

   (multiple pages can be definied using comma as separator)

回答2:

Download the new version of JSF framework.

See version 2.1.11 !

It's a problems caused for bug in ajax state request on internal jsf framework !

For more information please see link http://java.net/jira/browse/JAVASERVERFACES-1845;