Is the term "backing bean" actually used in the spec?
Simon Lessard wrote:
Actually Core Java Server Faces uses backing bean when you use binding
attribute on tags. The backing bean is then the bean holding the
UIComponent reference.
Regards,
~ Simon
On 12/17/06, *Simon Kitching* <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
Behrang Saeedzadeh wrote:
> Hi,
>
> What is the difference between a managed-bean and a backing-bean?
>
> 1) Aren't all backing-beans, managed-beans as well?
> 2) In which scenarios a managed-bean is not a backing-bean?
>
> I browsed through the JSF 1.1 spec and I couldn't find the definition
> for either of these terms. Overall I think the spec lacks a glossary
> (local value, etc. are not defined formally anywhere in the sepc.)
A "managed bean" is something defined in a faces config file using the
<managed-bean> tag.
AFAIK, the term "backing bean" is not a term used by the JSF spec at
all. It's a common web development term (struts, etc) that doesn't
entirely map to the JSF concepts. My personal interpretation is that
when a page (jsp/facelets/etc) contains EL expressions that mostly or
entirely map onto a single managed bean, then that managed bean can be
called the "backing bean" for that page. Note, however, that there is no
requirement in JSF for a page to access only one managed bean; it can
access a dozen if it wishes, in which case the term "backing bean"
really can't be applied.
And if I were using the Apache Shale View Controller, then I might use
the term "backing bean" to talk about the object that receives the
view-based callbacks, even if the associated page accesses a range of
other managed beans.
Cheers,
Simon
