title: Showing a warning message to a user after login
body: <p>I have a Liferay application in which users have a "membership plan". When a user logs in, I need to check if their membership plan has expired and show them a warning message. (The membership plan is independent of the login functionality. The user can still login even though his/her membership plan has expired).</p>
  
  <p>I thought of creating a post-login action. But I cannot access my service builder methods (<code>MemberPlanLocalServiceUtil.isPlanExpired()</code>) from this, or any other hooks that I create.</p>
  
  <p>What approach should I use to solve this problem? Would an ext plugin be necessary here? Or can I do something else?</p>