How to access @ViewScoped managed beans from Servlets?

Question

I would like to access a view scope managed bean inside a Servlet.

I searched for similar question and got these ones:

how to get beans from view scope which uses FacesContext.getCurrentInstance(), inapplicable inside a Servlet because it should give a null result

JSF - get managed bean by name which treats all other scopes but not viewscope

I'm going to think it is not possible, is it ?

There is the simple solution to change that bean scope to session scope but it is a last chance because I'm worried by memory consumption.

My final need is the following: the managebean contains some data displayed in a dataTable. The same page should include the image (mandatory) of chart representation of those data. The image can be produced by a Servlet but it needs to access the data or reload them from the db.

I also tried the <p:graphicImage> from PrimeFaces 2.X but it is not compatible with viewscope beans. Any suggestion?

Answer 1

That's not possible, no. The view scope is tied to a specific JSF view, which is no means of in a plain HTTP servlet request. Note that you can't access concrete request scoped beans during a plain HTTP servlet request either, they would always return null.

The session scope is the best what you can get. You can just remove the attribute from the session scope once you're finished with it in the servlet.

session.removeAttribute("somename");