Disabling session when clicking Log out button and redirecting to Login page with message

i want to disable sesssion on button click in an jsp page

i know:

<button type="button">Log out!</button>
<%session.invalidate();%>

how should i implement this ?

On click of button make a GET to a servlet, and in servlet invalidate the session and redirect it to login page

<a href="/app/logOutServlet">Log Out</a>

in servlet

doGet(....){
request.getSession().invalidate();
response.sendRedirect("URL_TO_LOGIN_PAGE");
}

Here is how I would do it:

• The button redirects to a Servlet, using either a form or JavaScript code (I would go for the form, I'm not such a big fan of JavaScript everywhere)
• The Servlet invalidates the session, using request.getSession().invalidate();