[jboss-user] [JBoss Seam] - How does the DataModel passes the data to the next page?

hubaer do-not-reply at jboss.com
Mon Mar 5 06:02:30 EST 2007

Hi all,

I try to understand the Issue-Tracker example, and hope that someone could explain me a little bit more about the page and object flow.

Esspecially I'm interested how the DataModel / dataTable works, because I need this in an application

Therefore I took the ProjectFinderBean, ProjectSelectorBean and ProjectEditorBean and extended them with some debug messages.

So I could figured out the dependencies between this 3 classes, if I click on one of the "View"-button:

  | Caller:                   ProjectFinder #1
  | -                            (Create)
  | JSF(@Factory) -------------> findProjects
  |                                                 ProjectSelector #1
  | JSF ----------------------------------------------> (Create)                         ProjectEditor #1
  |                                                        @In ---------------------------> (Create)   
  | JSF ----------------------------------------------> getButtonLabl (x-times)
  | JSF ----------------------------------------------> isCreateEnabled (x-times)
  | EndOfRequest (1)                                                                        destroy
  | EndOfRequest (2)                                                                        getIssueList
  | EndOfRequest (3)             destroy
  |                                                                                      ProjectEditor #2
  | "View"-button (4)                                       @In --------------------------> (Create) 
  |                           ProjectFinder #2
  |               (5)            (Create) <---------------- @In
  |                                                     isCreateEnabled (x-times)
  |                                                     select
  |               (6)            getSelection <------------                  
  |                                                         ------------------------------> setInstance
  | JSF                                                                                     getIssueList 
  |                                                                                         .
  |                                                                                         .
  |                                                                                         .

The number in the brackets are the points which are not really clear to me.

So here (maybe some newbie) questions:

(1) and (3): Does the tranisient keyword destroies the instances or the end of the request? Or both?
(2): Why is getIssueList() is called after destorying the ProjectEditorBean?
(4) and (5): Why is the @In is called after clicking on the "View"-button? Because of (1) and (3) ?
(6): How does the new instance of the ProjectFinderBean know which list entry was selected? Does this the PAGE-Scope on the @DataModel?

And one last question:
Why do I need session beans to pass the selected entry to another bean? Or is there a solution to do that with 2 beans.

Thank you in advance

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