<form:form commandName="book" action="/book_update" method="post">

    <fieldset>

        <legend>Edit a book</legend>

        <form:hidden path="id"/>

        <p>

            <label for="category">Category: </label>

             <form:select id="category" path="category.id" items="${categories}"

                itemLabel="name" itemValue="id"/>

        </p>

        <p>

            <label for="title">Title: </label>

            <form:input id="title" path="title"/>

        </p>

        <p>

            <label for="author">Author: </label>

            <form:input id="author" path="author"/>

        </p>

        <p>

            <label for="isbn">ISBN: </label>

            <form:input id="isbn" path="isbn"/>

        </p>

        <p id="buttons">

            <input id="reset" type="reset" tabindex="4">

            <input id="submit" type="submit" tabindex="5"

                value="Update Book">

        </p>

    </fieldset>

</form:form>