[jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-2597) Exception handling - JSF swallows exceptions in certain phases

[Pete Muir (JIRA)]

    [ http://jira.jboss.com/jira/browse/JBSEAM-2597?page=comments#action_12399899 ] 
            
Pete Muir commented on JBSEAM-2597:
-----------------------------------

1) is JSF - exception is swallowed in UIInput:updateModel - there are no hooks in JSF to implement custom exception handling. In fact i believe the behaviour you are seeing is mandated by the spec.

> Exception handling - JSF swallows exceptions in certain phases
> --------------------------------------------------------------
>
>                 Key: JBSEAM-2597
>                 URL: http://jira.jboss.com/jira/browse/JBSEAM-2597
>             Project: JBoss Seam
>          Issue Type: Feature Request
>          Components: Core
>            Reporter: Shane Bryzak
>             Fix For: 2.1.0.GA
>
>
> I can't reproduce this right now but I'm sure I spent several hours
> with a debugger only to find out that I had a typo in a value binding
> and that the exception was completely swallowed during an early JSF
> phase (UPDATE MODEL probably). There was nothing in the log, the
> action phase just never executed. This is a major issue (obviously)
> for another subtle reason: Beginners have trouble understanding the
> JSF lifecycle and processing phases - I know I did. You begin to hate
> JSf when you don't understand why a certain phase does not execute.
> I'd start reproducing it by generating an NPE in a value binding
> setter, that should do it.

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