jsp forward not functioning

If the form in AddStudent.jsp was completed, StudentsList.jsp shows all the students, else the MainMenu.html is displayed.

StudentsList.jsp

<%
if(request.getParameter("add_stud") != null){ 
   //read parameters from the form in the AddStudents.jsp (works OK)
   //inserting the student in the database (works OK)
 }
%>}else{%>
        <jsp:forward page = "MainMenu.html"/> 
     <%}%>

Also if one field of the form is not completed, a javascript alerts "Type this in the X field".

Is it because of that, the jsp:forward is not forwarding?

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