Sorry, I should be more clear when discussing EL. An Expression
Language or EL is a concept I think we all agree is a good thing.
Implementations of EL include JSP 2.0, JSF 1.0, the Unified EL, OGNL,
Jexl, JXPath, and many others. Struts 1.x used a poor man's EL through
Beanutils, which lacked many of the features you now associate with EL.
The Unified EL is used by the next JSF and JSP (2.1 I think) with the
purpose of unifying the different incarnations of EL they both used.
OGNL is used by Action 2/WebWork, Tapestry, Wicket, and several others.
It is the most advanced EL with the most features, however some of those
aren't well documented.
My point was first, Action 2 should allow you to plug in any EL you'd
like, including the Unified EL, and second, at this point, I don't see
the Unified EL replacing OGNL for primarly usage, mainly because the
Unified EL lacks several key features, the lack of which is a conscious
decision of the working group. Still, I'm sure there will be those
Action 2 users who would rather have the familarity of the Unified EL
over the advanced features of OGNL, so we hope to make that an option
some day.
Don
Michael Jouravlev wrote:
On 4/9/06, Don Brown <[EMAIL PROTECTED]> wrote:
Using
EL, on the other hand, I personally don't see as a great benefit. The
new unified EL lacks many of the key features that makes EL and OGNL in
particular, so attractive. For example, OGNL supports method
invocation, type conversion, and projection, features, AFAICT, aren't
supported by EL and won't ever be.
I see an advantage of unified EL in creating proper names for HTML
input elements and automatic propagation if input data to backing
beans. Basically, this is kind of Struts HTML tags + beanutils +
proper type conversion or WebWork tags + OGNL. Doing it JSF way is
more unified, instead of having different Struts 1, Struts 2 or
Stripes way. This feature is not planned for JSP 2.1, but I think it
can be implemented. Sun pushes JSF and implements new features in JSF
only.
Michael.
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