Using EL in custom tag with JSP1.2 container

Question

I search the the Forum here and Google for a method how I can use expression language in my custom tag. But I have to use a JSP1.2 container which makes it quite difficult. What I need is startsWith-Tag which looks like this.
<str:startsWith condition1="${sql.rows[0].MY_COLUMN}" condition2="MyCondition">
</str:startsWith>Right now my tag works, but instead of the database of MY_COLUMN the string ${sql.rows[0].MY_COLUMN} is submitted.
In the TLD I specified rtexprvalue with true. My custom tag extends javax.servlet.jsp.jstl.core.ConditionalTagSupport.
What I read here was that I have to evaluate the el expression myself, but how do I do this? I hope someone can give me a hint how to make the tag working correctly.
TIA
Axel

Answer 1

You might find the source code of MicroNova YUZU (http://sourceforge.net/projects/micronova-yuzu) useful. It is an EL-based tag library that supports both JSP 1.2 and 2.0. See "jsp12" and "jsp20" subdirectories for version-specific EL handling. Hope this helps.