@Entity
@Table(name="products")
public class Product {
   @Getter
   @Setter
   @Id
   private Long productId;
   @Getter
   @Setter
   private Long productName;
}

public class QuoteForm {
   @Getter
   @Setter
   private Long quoteId;
   @Getter
   @Setter
   private Long contactId;
   @Getter
   @Setter
   private Set<ProductEntry> products;
 }

public class ProductEntry {
  @Getter
  @Setter
  private TempProduct product;
  @Getter
  @Setter
  private Long quantity;
  @Getter
  @Setter
  private float discount;
}

<form id="productTable" th:object="${quoteForm}">
<input type="number" th:field="*{contactId}"></input>
<table id ="productList"
          class="table table-striped table-bordered"
          cellspacing="0"
          width="100%">
    <thead>
      <tr>
        <th>Name</th>
        <th>Quantity</th>
        <th>Discount</th>
      </tr>
   </thead>
   <tbody>
      <tr th:each="product : ${productData.getProducts()}">
      <td name="?">
          <a th:text="${product.getProductName()}"
                       th:href="@{|/product/records/${product.getProductId()}|}">
          </a>
      </td>
      <td>
          <input type="number"
                 name="?"
                 th:field="*{products.quantity}">
           </input>
      </td>
      <td>
         <input type="number" name="?" th:field="*{products.discount}"></input>
     </td>
    </tr>
  </tbody>