<inputtype="text"th:field="*{username}"id="username"name="username"placeholder="Username"class="form-control"pattern=".{4,16}"requiredtitle="4 to 16 characters"/>
<inputtype="password"th:field="*{password}"id="password"name="password"placeholder="Password"class="form-control"pattern=".{5,32}"requiredtitle="5 to 32 characters"/>