title: SESSION_USERNAME cannot be resolved or is not a field
body: <p>I am using JSP and calling classes in the file.
  Here is my source code.</p>
  
  <pre><code>&lt;%@ page import="abc.common.Constants" %&gt;
  &lt;%@ page import="abc.util.SessionHandler" %&gt;
  &lt;%
  if (!SessionHandler.isAliveSession(request)
  ||  StringUtils.isBlank(SessionHandler.getSessionValue(request, 
  Constants.SESSION_USERNAME))) {
      response.sendRedirect("/login.jsp");
  }
  %&gt;
  </code></pre>
  
  <p>The error message is below.
  <strong>JBWEB004060: An error occurred at line: 13 in the jsp file: /WEB-INF/view/home.jsp
  SESSION_USERNAME cannot be resolved or is not a field</strong></p>
  
  <p>There is no error in this part, "SessionHandler.isAliveSession(request)".
  When I use an IDE, there is no error and building this war was ok.
  When I run the jsp, the error happened.</p>
  
  <p>It could call isAliveSession(), but why there is an error at 'SESSION_USERNAME'?
  What did I miss?</p>