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access FacesContext from JMX NotificationListener

tammam fadel
Greenhorn

Joined: Jan 25, 2012
Posts: 1
hi;
I have a JSF web application that has a JMX notification listener, I have a Comet Component that is updating a webpage om certain events, but I need to update a certain value in the page when a JMX Server sends the JMX client embedded in my web app a certain notification. I'm receiving the notification but I do not have access to the FacesContext to retrieve the session-scoped backbean (which contains the Comet Channel) from session.

please can anyone help me?

note: I tried to store the FacesContext current instance in a statix global variable, bu when I try to use it I got an exception that this instance must be released before being candidate to use again
Tim Holloway
Saloon Keeper

Joined: Jun 25, 2001
Posts: 15960
    
  19

Welcome to the JavaRanch, Tammam!

I see 2 problems here. First, JMX MBeans aren't supposed to be application components. They're supposed to be components that manage and monitor other components.

Secondly, and more seriously, the FacesContext is not a durable datastructure. Not only can you not cache it, it doesn't even exist at all, most of the time!

A FacesContext is constructed when a JSF URL request comes in. Each request gets its very own FacesContext custom-built to handle that request. The FacesContext is the repository for JSF internal information needed to process the request and generate the response to the request. Once that response has been generated and sent back to the client, that particular FacesContext is destroyed. If you attempt to cache it, you'll end up with a component whose contents are obsolete, incorrect, and otherwise useless.

You could create a JSF View that accesses an MBean, as far as it goes, but the reverse is not true.


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