title: Cause of "Error deploying configuration descriptor" on Tomcat 7.0.12
body: <p>When I try to deploy a WAR file by dropping it into webapps directory, I get following message in the console:</p>
  
  <pre><code>04.05.2011 19:34:07 org.apache.catalina.startup.HostConfig deployWAR
  SEVERE: Error deploying configuration descriptor xyz.war
  </code></pre>
  
  <p>I didn't find any hints about the detailed cause of this in the logs.</p>
  
  <p>Where can I find out the details (e. g. the stack trace) about this failure?</p>
  
  <p>Here's the web.xml:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
      xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
      id="WebApp_ID" version="2.5"&gt;
      &lt;display-name&gt;myapp&lt;/display-name&gt;
      &lt;context-param&gt;
          &lt;description&gt;
      Vaadin production mode&lt;/description&gt;
          &lt;param-name&gt;productionMode&lt;/param-name&gt;
          &lt;param-value&gt;false&lt;/param-value&gt;
      &lt;/context-param&gt;
      &lt;servlet&gt;
          &lt;servlet-name&gt;Project Control Center Application&lt;/servlet-name&gt;
          &lt;servlet-class&gt;com.vaadin.terminal.gwt.server.ApplicationServlet&lt;/servlet-class&gt;
          &lt;init-param&gt;
              &lt;description&gt;
          Vaadin application class to start&lt;/description&gt;
              &lt;param-name&gt;application&lt;/param-name&gt;
              &lt;param-value&gt;at.mycompany.myapp.ProjectControlCenterApplication&lt;/param-value&gt;
          &lt;/init-param&gt;
      &lt;/servlet&gt;
      &lt;servlet-mapping&gt;
          &lt;servlet-name&gt;Project Control Center Application&lt;/servlet-name&gt;
          &lt;url-pattern&gt;/*&lt;/url-pattern&gt;
      &lt;/servlet-mapping&gt;
      &lt;welcome-file-list&gt;
          &lt;welcome-file&gt;index.html&lt;/welcome-file&gt;
          &lt;welcome-file&gt;index.htm&lt;/welcome-file&gt;
          &lt;welcome-file&gt;index.jsp&lt;/welcome-file&gt;
          &lt;welcome-file&gt;default.html&lt;/welcome-file&gt;
          &lt;welcome-file&gt;default.htm&lt;/welcome-file&gt;
          &lt;welcome-file&gt;default.jsp&lt;/welcome-file&gt;
      &lt;/welcome-file-list&gt;
      &lt;listener&gt;
          &lt;listener-class&gt;at.mycompany.myapp.impl.persistence.DatabaseStartStopServletContextListener&lt;/listener-class&gt;
      &lt;/listener&gt;
      &lt;session-config&gt;
          &lt;session-timeout&gt;480&lt;/session-timeout&gt;
      &lt;/session-config&gt;
  &lt;/web-app&gt;
  </code></pre>