How to disable first option in select drop in spring form

disabled="disabled" Is used to disable the first options in the select dropdown in spring form below is the example

<sf:select class="select form-control-lg" path="type">
                <option selected="true" disabled="disabled">Select Leave Type</option> 
                  <sf:option value="CL" label="CL"/>
                  <sf:option value="PL" label="PL"/>
                  <sf:option value="SL" label="SL"/>
                </sf:select>

Disable input into the spring form

readonly="true"An attribute will disable any input field into the spring form.

<sf:input readonly="true" type="text" id="email" class="form-control form-control-lg" path="email" name="email" value="${sessionScope.user.email}"/>