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org.Apache.catalina.startup.Catalina

// When the 'engine' is found, set the parentClassLoader.
digester.addRule("Server/Service/Engine",
                 new SetParentClassLoaderRule(parentClassLoader));

  <Service name="Catalina">
    <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />

    <Engine name="Catalina" defaultHost="localhost">
      <Host name="localhost"  AppBase="webapps"
            unpackWARs="true" autoDeploy="true">
      </Host>
    </Engine>
  </Service>

org.apache.catalina.loader.WebappClassLoader