Spring boot list binding

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Java

Spring

Hello every Body ,

I m trying to save a list of order in my controller but i had a different type of order and each type had some specific entries how can i do that .I m using in my entity class inheritance type equal to joined

("@Inheritance(strategy = InheritanceType.JOINED)")

. Any body had an idea how to do that ?

What I have tried:

<form action="#" th:action="@{/order/save}" th:object="${form}"
  method="post">
    <fieldset>
        <input type="submit" id="submitButton" th:value="Save">
        <input type="reset" id="resetButton" name="reset" th:value="Reset"/>
        <table>
            <thead>
                <tr>
                    <th> Title</th>
                    <th> Author</th>
                </tr>
            </thead>
            <tbody>
                <tr th:each="order, itemStat : *{orders}">
                    <td><input th:field="*{orders[__${itemStat.index}__].title}" /></td>
                    <td><input th:field="*{orders[__${itemStat.index}__].author}" /></td>
                </tr>
            </tbody>
        </table>
    </fieldset>
</form>