Tomcat 7 Multi Aliases Problem

I see Tomcat 7 give me a confusing about adding multiple aliases (virtual hosts) to a webapp. I am not sure if it a bug of Tomcat 7 because it cannot work if I add multiple virtual hosts to a webapp. It works for only the top (first) virtual host. For example:

<webapp name="ecommerce"
title="eCommerce"
server="default-server"
location="webapp/ecommerce"
mount-point="/ecommerce"
app-bar-display="false">
<virtual-host host-name="localhost1"/>
<virtual-host host-name="localhost2"/>
</webapp>

It will work only localhost1, localhost2 will not work. This is a log I got:

Nov 18, 2011 5:45:32 PM org.apache.coyote.http11.AbstractHttp11Processor process
SEVERE: Error processing request
java.lang.ClassCastException: org.apache.tomcat.util.http.mapper.Mapper$Host cannot be cast to org.apache.catalina.Host
at org.apache.catalina.connector.Request.getHost(Request.java:631)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:105)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:964)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)

Any idea?

Regards,
Chatree Srichart