JSP doesnt display data from DB only if I click on the link leading to its data

Question

So, I've been trying to figure this out for quite while, basically I am making webshop in Java(for college), and what I want to do is to display data from DB on my front page or as in dropdown menu. But it doesnt work until I press on link which has same data, and when I return to page I previously wanted to display in, it shows.

Here is mine JSP and Servlets:

---

  <div class="row">

      <c:forEach items="${products}" var="item">
        <kova:test
                product="${item}"></kova:test>

      </c:forEach>

    </div>
***

***
<%@tag description="put the tag description here" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<%@attribute name="product" type="model.Product"
             required="false" %>
    <div class="col-lg-4 col-md-6 mb-4">
        <div class="card h-100">
            <a href="#"><img class="card-img-top" src="http://placehold.it/700x400" alt=""></a>
            <div class="card-body">
                <h4 class="card-title">
                    <%--<form action="product" method="post">
                        <input type="hidden" name="idProduct" value="${product.productId}"/>
                        <button type="submit" id="btn" class="btn btn-info" >View</button>
                    </form>--%>
                    <a href="#">${product.title}</a>
                </h4>
                <h5>${product.price} kn</h5>
                <p class="card-text">${product.about}</p>
            </div>
            <div class="card-footer">
                <small class="text-muted">&#9733; &#9733; &#9733; &#9733; &#9734;</small>
            </div>
        </div>
    </div>

---

---

 protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        IRepo iRepo = RepoFactory.getRepo();

        req.getSession().setAttribute("products",
                iRepo.getAllProducts());

        RequestDispatcher rd =
                getServletContext().getRequestDispatcher(
                        "/products.jsp");
        rd.forward(req, resp);

    }

---

And here is the jsp that works if I click its link:

 <div class="row">
    <h1 id="h1">All products</h1>
    <div class="row products">
        <ul>

            <c:forEach items="${products}" var="item">
                <li><kova:test
                        product="${item}"></kova:test></li>
                <hr>
            </c:forEach>
        </ul>
    </div>

</div>