title: What does this web.xml error mean?
body: <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  
  &lt;web-app version="2.5" 
      xmlns="http://java.sun.com/xml/ns/j2ee" 
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
      xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_5.xsd"&gt;
  </code></pre>
  
  <blockquote>
    <p>Referenced file contains errors (http://java.sun.com/xml/ns/j2ee/web-app_2_5.xsd).  For  more information, right click on the message in the Problems View and select "Show Details..."</p>
  </blockquote>
  
  <p>The errors below were detected when validating the file "web-app_2_5.xsd" via the file "web.xml".  In most cases these errors can be detected by validating "web-app_2_5.xsd" directly.  However it is possible that errors will only occur when web-app_2_5.xsd is validated in the context of web.xml.</p>
  
  <p>In details, I see a bunch of these:</p>
  
  <blockquote>
    <p>s4s-elt-character: Non-whitespace characters are not allowed in schema elements other than xs:appinfo and xs:documentation. Saw 'var _U="undefined";'</p>
  </blockquote>