redirect loop leads me to troubles. Please fix it.

[Kumaraswamy nandipati]

Hi., I am using ofbiz for my web-application. In the shopping cart for now pages are, checkout-->review-->processorder. If there is any mandatory errors or success the url will show review. But I want to change it like this, If there is any mandatory errors in checkout page will redirect to same page but url will be checkout-errors. So, I am using request-redirect in the controller as follows. This leads to redirect loop and some fields are url encoded. How can I solve this issue. I am using FTL as front end.
Any replies will be appriciated.