virtual host issue

[sunlinux]

on linux using Jboss 4.2.2GA, facing issue on virtual host configuration .. it shows blank page on opening in browser

http://kn.example.com:8080


below is server.xml conf for virtual host.

<Host name="kn"
 autoDeploy="false" deployOnStartup="false" deployXML="false">
 <Alias>kn.example.com</Alias>
 <Valve className="org.apache.catalina.valves.AccessLogValve"
 prefix="kn" suffix=".log"
 pattern="common" directory="${jboss.server.home.dir}/log"/>
</Host>

below is jboss.web.xml in application "my.war"

<jboss-web>
<context-root>/</context-root>
<virtual-host>kn.example.com</virtual-host>
</jboss-web>

pls. guide.. my DNS is resolving ok that host.

[sunlinux]

below error in jboss startup logs


22:34:21,196 WARN [TomcatDeployer] Failed to map vhost: kn.example.com
22:34:21,196 INFO [TomcatDeployer] deploy, ctxPath=/Calendar, warUrl=.../tmp/deploy/tmp43393Calendar-exp.war/
22:34:21,397 WARN [config] Unable to process deployment descriptor for context 'null'
22:34:22,621 WARN [config] Unable to process deployment descriptor for context 'null'
22:34:22,762 WARN [config] Unable to process deployment descriptor for context 'null'
22:34:23,016 WARN [config] Unable to process deployment descriptor for context 'null'
22:34:24,005 WARN [config] Unable to process deployment descriptor for context 'null'
22:34:24,416 WARN [config] Unable to process deployment descriptor for context 'null'
22:34:24,719 WARN [config] Unable to process deployment descriptor for context 'null'