public String getCategoryList(Model model) {
        List<Category> categoryList = categoryService.getAllCategory();
        model.addAttribute("categoryList", categoryList);
        return "redirect:/manageProduct";

    }

@Override
    public List<Category> getAllCategory() {
        CriteriaQuery<Category> criteriaQuery = HibernateUtil.getSession(sessionFactory).getCriteriaBuilder()
                .createQuery(Category.class);
        criteriaQuery.from(Category.class);
        List<Category> categoryList = HibernateUtil.getSession(sessionFactory).createQuery(criteriaQuery)
                .getResultList();
        return categoryList;
    }

<label>Product Category</label> <select name="category"
                        class="browser-default custom-select mb-4">
                        <option value="" disabled selected>Choose Category</option>
                        <c:forEach items="${categoryList}" var="catList">
                            <option value="${catList.id}">${catList.categoryName}</option>
                        </c:forEach>
                    </select>