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session not available in a jsp file?

reubin haz
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Joined: May 12, 2005
Posts: 287
I have a JSF project. In the back beaning classes, I use the following to access session:

HttpSession session =(HttpSession) FacesContext.getCurrentInstance().getExternalContext().getSession(false);

But FacesContext.getCurrentInstance() is throwing null pointer exception in a Java class that is not getting used by any jsp, even though I registered this class in face-config.xml as <managed-bean>.

Why would I get this error? How should I write a Java class so that FacesContext is instanticated before I use it?

Thanks.


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Tim Holloway
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Joined: Jun 25, 2001
Posts: 15962
    
  19

FacesContext is instantiated and destroyed on each JSF HTTP request. It doesn't linger between requests, and it is only created by the Faces Servlet, so if an Http URL request doesn't get routed through the Faces Servlet, you won't have a FacesContext. That specifically means non-faces servlet requests and page requests made to stand-alone JSPs that aren't JSF JSPs.

Usually, if you're attempting to explicitly access a session inside a JSF managed bean, you're doing something wrong. That's because the JSF bean management framework should probably be injecting what you need instead of coding the bean to be explicitly dependent on running inside JSF.


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