thymeleaf select default code example
Example: how to set a default value for a dropdownlist in html with thymeleaf spring
<label for="drink">Drink</label>
<select id="drink" name="drink">
<option th:each="drink : ${drinks}" th:text="${drink.name}" //drinks are an array of ENUMs here, drink.name are the lowercase equivalent
th:value="${drink}" th:selected=${drink==customer.drink}></option> //the customer's last drink will be the default
</select>