Custom Validator is the only solution?

Hi. I do hope I can get some help.

I have a form that need to be validated and that's easy to do using Validator framework included in struts.

My problem is, after failed validation, I need to forward it to a dynamic page where several parameter value are needed. I know I can't do that in struts-config.xml file.

So this means that I have no other choice but to have a custom validator form?

Thank you in advance.