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From "Sgarlata Matt" <>
Subject Re: API for expression language evaluation
Date Wed, 20 Aug 2003 13:13:57 GMT
Yes, there is.  For an example on how to add the EL to your own tags you 
can look at the struts-el tag libraries which are included as part of 
the Struts core.  I use the org.apache.strutsel.taglib.utils.EvalHelper 
class to evaluate EL expressions.  This ties my application to Struts, 
but I am comfortable with that.  If you are not, it should be simple to 
tie your classes only to the JSTL by only referencing the 
class, which the EvalHelper depends on.


Johann Uhrmann wrote:

> Hello,
> is there an API for expression language evaluation?
> E.g. it should be able to evaluate the following attribute values:
> ${}
>   Should be evaluated to the property value of the bean.
> ${empty collection}
>   should be evaluated to true/false
> foobar
>   should become the string "foobar".
> Does the JSTL provide such an API?
> Thank You,
> Hans
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Matthew Sgarlata
Senior Consultant
Booz Allen Hamilton Inc.
Work: 703-377-0871
Fax: 703-902-3608

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