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javadependency-injectionseambijection

Seam Session scoped component vanishes in next request

I have the Seam session-scoped component, CustomIdentity which overrides the standard Seam Identity (also session-scoped). The extended CustomIdentity has a property 

@Out(required=false, scope=ScopeType.SESSION)private User user

In the overriden login() I define a User object, populated with information from the Principal of the HttpServletRequest. In the first request in the application the User object is outjected as expected in SESSION scope. In the second request, though, the User object has vanished from the Session, and when I visit a page that Injects it, I get an exception.

My question is when exactly the component is outjected:

  • After each and every one method of the CustomIdentity component (even if it does not contain a reference of user)?
  • After each method that contains a reference of the User component?

And about the required attribute:

  • If upon outjection the User object evaluates to null, is the already outjected User going to be removed from Session scope?

Cheers!

Solution

  • To your first question: the component is oujected after each and every method of CustomIdentity. Take a look at the corresponding Seam source code org.jboss.seam.core.BijectionInterceptor (Seam 2.2.0). Bijection takes place at component, i.e., class, level.

    To your second question: every time a request to CustomIdentity finishes, the value of your field is outjected. If you use the outjection property require=false, the user that is currently outjected in your session context may be overridden by null.