title: Why Tomcat library folder WEB-INF/lib is empty?
body: <p>I deploy my Maven webapp using Spring MVC in Eclipse Tomcat. Everything works OK for quite a week. Suddenly, today I modify a properties file, rebuild and redeploy the webapp. There's a class not found error: </p>
  
  <pre><code>SEVERE: Error configuring application listener of class org.jasig.cas.client.session.SingleSignOutHttpSessionListener
  java.lang.ClassNotFoundException: org.jasig.cas.client.session.SingleSignOutHttpSessionListener
  </code></pre>
  
  <p>Look at publish folder (tmp0) of Tomcat server plugin located in workspace folder, there are no jars in WEB-INF/lib any more. I don't know why? I have rebuilt/deployed it many times today, and have found no problem. </p>
  
  <p>Could someone give an advice? Thanks very much.</p>
  
  <p>EDIT:</p>
  
  <p>I can't find a right solution for this problem, though I temporarily bypass it by removing the web app from Tomcat Server, do a clean up, then add it back again.</p>