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From Henri Yandell <>
Subject RE: [EL] instanceof
Date Fri, 07 Feb 2003 21:31:06 GMT

On Fri, 7 Feb 2003, O'brien, Tim wrote:

> > I imagine EL will not be able to implement it until it is in
> > the JSP 2.0 specification as, as far as I know, commons-el is
> > the EL component of the JSP 2.0 spec.
> >
> > But I could be utterly wrong :)
> I understand that it is dependent on a JCP developed spec, was just
> wondering if ASF could (or even wanted to) provide functionality outside of
> the specification - EL is a part of the JSTL spec - JSR-052 and a port of
> the JSR-152.
> Seems like the commons at ASF is full of packages that frequently extend the
> functionality of the existing frameworks - beanutils and collections.  I'm
> just curious as to the direction of commons-el.  If JSR-152 Section JSP.2.4
> tells developers not to use "instanceof", it seems like it would be harmless
> to implement this as a BinaryOperator

Worth asking, possibly to the Tomcat-dev list. The difference between
collections/beanutils and commons-el is that commons-el is the Reference
Implementation, and I think the view is that it should do no more and no
less than the specification itself.


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