title: get session attribute in velocity template
body: <p>I try to get session attribute in velocity template, spring boot
  but I can't get session attribute.</p>
  
  <pre><code>$!request.getParameter('user')
  $request.getParameter('user')
  #set ($user = $request.get('user'))
  $user
  $session.geAttribute('user')
  $request.getSession().getAttribute('user')
  </code></pre>
  
  <p>I try to use theses.. but, I couldn't get right value.</p>
  
  <p>How can I get session attribute in Velocity?</p>