➋

            <li class="nav-item">
                <sec:authorize access="isAuthenticated()">
                    <form:form action="${pageContext.request.contextPath}/logout" method="POST">
                    <input type="submit" class="btn btn-success" value="Logout"/>
                    </form:form>
                </sec:authorize>
            </li>

➌

            <li class="nav-item">
                <sec:authorize access="!isAuthenticated()">
                    <a class="nav-link" href="<c:url value="/login"/>">Login</a>
                </sec:authorize>
            </li>

        </ul>
        </div>
    </div>
</nav>