2 problems in JSP

[arpit singla]

2 problems regarding JSP:
I have a register JSP where user registers for a website, this JSP calls a servlet which inserts the data in the database. If user does not fills in the required fields, i want to display the warning message on the JSP along with the fields which have already been filled by the user.
If the required field has been filled or not, i am verifying that in the servlet and then calling the JSP again(requestdispatcher). do i need to embed the warning message in the dispatcher.
please let me know how to put this functionality.
thanks

[Swapna Sam]

If you write java-script function for these messages to pop when appropriate required field is not given by the end-user.
It's not required for your JSP page communicate to servlet until all required fields are given
Hope this helps u