JSP/Servlet form processing problem - please help

I'm using the apache.commons.fileupload library to process a form that will ultimately insert an image into an Oracle database. At the moment, I'm not even at the database stage although I have code to do it. I'm just trying to validate that all the form fields are filled out. A JSP page posts a form to a Servlet which then checks that each field contains something. If the field is null/empty, then I use a RequestDispatcher object to forward back to the JSP with the form on it.
Here is the problem... If I intentionally leave the form empty then the Servlet does indeed send the user back to the JSP. However, if I then complete all fields in the form after being returned to the JSP and submit the form, I am forwarded back to the JSP rather than executing the next statement in the Servlet. It's as though once I have filled out the form the null entries are being retained and the new entries are being ignored.
Can anyone help? Perhaps I am not understanding the request/response model properly as I am used to PHP programming?

Can you double check? Suppose you just go to the JSP. Fill in all the fields as you did before. Submit the form. Does it go to the next statement in the servlet?

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