FYI, the problem was not in the EL or JSF 1.2_04. Rather, the problem was
in a custom renderer that had a finally block that threw an exception (so
the original NPE was "lost").
I did upgrade to JSF 1.2_04 P01 and didn't have any problems.
Adam Brod
Product Development Team
From:
Ryan Lubke <Ryan.Lubke_at_Sun.COM>
To:
users_at_javaserverfaces.dev.java.net
Date:
05/02/2007 04:00 PM
Subject:
Re: Does the EL swallow NullPointerExceptions?
Adam,
What version of 1.2 are you using? If I recall correctly, Ed added a
fix in the EL wrapper area to prevent exception
swallowing. This fix was made available in 1.2_04 P01.
Adam Brod wrote:
>
> Is it possible that the EL would swallow NullPointerExceptions that
> bubble up from the persistence layer? We have a bean property in a
> managed bean that loads some items from the DB and wraps them in a
> DataModel. It seems that when the method is called through the EL:
>
> <h:dataTable value="#{myBean.dataModel}" var="item">
>
> The NullPointerException is swallowed and the page continues to render
> (causing all sorts of problems). If this is expected EL behavior,
> then I'll have to ensure my javabean properties never throw NPEs. I
> know the EL is pretty relaxed about handling null values when trying
> to output Strings on the page. However, since this value is a
> DataModel, and is not being coerced into a String, I would think the
> NPE should propagate up and send the user to an error page.
>
> Any tips would be greatly appreciated.
> *
> Adam Brod*/
> Product Development Team/
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