Need help in my code

Hi all ,

This is my first project I work in , and I need help to solve a problem
..

I have a method to insert data from JSP page ' form1' into database
then return a number ' X ' from database to another JSP page ' form2 '
..

the problem is : each time I refresh ' form2 ' the number ' X '
increase coz the servlet code excuted and invoke the methode to insert
the same data into DB then return the new value of ' X ' although some
of entered data are defined as primary key or unique fields and should
not be entered twice .

what should I do ??

.