title: java.lang.ClassNotFoundException: org.apache.jsp.WEB_002dINF.pages.LandingPage_jsp
body: <p>I'm getting two very odd errors when opening a project. If I open the landing page and keep refreshing it, the error messages alternate between the two below.</p>
  
  <p>Either I get this:</p>
  
  <pre><code>org.apache.jasper.JasperException: /WEB-INF/pages/LandingPage.jsp (line: 2, column: 0) The absolute uri: http://www.springframework.org/security/tags cannot be resolved in either web.xml or the jar files deployed with this application
  </code></pre>
  
  <p>Or this:</p>
  
  <pre><code>HTTP Status 500 - java.lang.ClassNotFoundException: org.apache.jsp.WEB_002dINF.pages.LandingPage_jsp
  </code></pre>
  
  <p>What on earth is happening?</p>