Need help with getting parameters from dropdown menu

[Uma chukka]

Hello I am the beginner in developing JSP pages. Can anyone help me how to get parameters from a drop down menu. I have gone through some forums. they are suggesting to use jstl. I have applied jstl and code looks like this

<form action="recipie.jsp" >
<div class="dropdown">
  <button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown" aria-expanded="true">
    Select product
    <span class="caret"></span>
  </button>
  <ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">
  <% for(RecipieProductAllergen app1:RecipieProductAllergen) {
     %>
    <li role="presentation"><a name="ProdName" role="menuitem" tabindex="-1" 

<c:url value="recipie.jsp" var="displayURL">
  <c:param name="ProdName"   value="${param.name}" />
  
</c:url>
><%= app1.getProdName() %></a></li>
    
    <%}%>
  </ul>
</div>
</form>

I have to get parameters so getting them here

<%
ApplicationsDAO dao = new ApplicationsDAO();
String action = request.getParameter("action");
String ProdName = request.getParameter("ProdName");
RecipieColumns2 rc2 = new RecipieColumns2(ProdName);
	
	dao.selectProductsString(rc2);

%>

Can anyone help me with this?
Thanks in advance.

[Bear Bibeault]

The suggestion to use JSTL was to remove any Java code from your page. Java code has no place in a modern JSP. That is a technique that has been obsolete for 13 years. 13 years!

You should also not be submitting a form to a JSP. That's also something that is a poor and outdated practice. Your form should submit to a servlet where the parameters will be available from the request instance.

I recommend newcomers to JSP read the following articles:

The Secret Life of JSPs

The Front Man

The first will make sure you understand what JSP is, and how it works. The latter will outline the proper structure for Java web apps.