Hi Bauke,
It is in the specification and popping up the alert is ONLY done in 
Development stage and ONLY when there is no user registered error handler.
Thanks!
Kind regards,
Manfred Riem
On 8/12/15, 12:22 PM, Bauke Scholtz wrote:
> Hi,
>
> If it's not in JSF spec, then we should at least make sure it shows in 
> dev stage only.
>
> Cheers, B
>
>
> On Wed, Aug 12, 2015 at 4:36 PM, manfred riem <manfred.riem_at_oracle.com 
> <mailto:manfred.riem_at_oracle.com>> wrote:
>
>     Hi all,
>
>     Looking at JAVASERVERFACES_SPEC_PUBLIC-1284 I think we should be
>     able to close this one out as "Won't fix". A developer can put in
>     their own JS function that handles errors and make a decision on
>     what needs to show up (if any). The default is there as a default.
>
>     Ed, and others, what do you think?
>
>     Thanks!
>
>     Kind regards,
>     Manfred Riem
>
>