Relevant web.xml part

  <login-config>
    <auth-method>FORM</auth-method>
    <form-login-config>
      <form-login-page>/login.html</form-login-page>
      <form-error-page>/login-failed.html</form-error-page>
    </form-login-config>
  </login-config>

  <security-constraint>
    <web-resource-collection>
      <web-resource-name>Wildcard means whole app requires authentication</web-resource-name>
      <url-pattern>/*</url-pattern>
      <http-method>GET</http-method>
      <http-method>POST</http-method>
    </web-resource-collection>
    <auth-constraint>
      <role-name>site-users</role-name>
    </auth-constraint>
    <user-data-constraint>
      <transport-guarantee>CONFIDENTIAL</transport-guarantee>
    </user-data-constraint>
  </security-constraint>

   <security-role>
      <description>This logical role includes all authenticated users</description>
      <role-name>site-users</role-name>
   </security-role>