browser back + viewscope beans

Question

What the problem is : What happens when clicking on the browser back button --> opens up a page whose viewscoped-managedbean is already destroyed --> submit

Answer 1

The browser seems to have served the page from its cache instead of sending a fullworthy HTTP GET request to the server, while you have JSF state saving method set to server (which is the default).

There are 2 ways to solve this problem:

1. Tell the browser to not cache the dynamic JSF pages. You can do this with help of a filter.

   @Override
   public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
       HttpServletRequest req = (HttpServletRequest) request;
       HttpServletResponse res = (HttpServletResponse) response;
   
       if (!req.getRequestURI().startsWith(req.getContextPath() + ResourceHandler.RESOURCE_IDENTIFIER)) { // Skip JSF resources (CSS/JS/Images/etc)
           res.setHeader("Cache-Control", "no-cache, no-store, must-revalidate"); // HTTP 1.1.
           res.setHeader("Pragma", "no-cache"); // HTTP 1.0.
           res.setDateHeader("Expires", 0); // Proxies.
       }
   
       chain.doFilter(request, response);
   }
   

   Map the filter on the FacesServlet or its same URL-pattern.

2. Set the JSF state saving method to client, so that the entire view state is stored in a hidden field of the form instead of in the session in the server side.

   
       javax.faces.STATE_SAVING_METHOD
       client
   
   

The filter way is preferable.