I think this is as straightforward a error as one can get:
I believe this is because you are still referencing JSTL tags in your code.
If you want to use Struts to accomplish your task, your best bet is to learn how to use Struts properly, then apply that knowledge to your task. The Struts documentation has a page with a number of
tutorials. I seem to remember the
CRUD tutorial being valuable for a beginner.
Of course, we welcome any questions or problems you have along the way!