Firefox extension automatic update feature

I am following the tutorial at http://www.borngeek.com/firefox/automatic-firefox-extension-updates/ to make my FF extension can be updated automatically to users, but I stuck at the last part "Hosting an Update Manifest" as I am using Tomcat serve and I have no ideas how to set up the .htaccess (Is the .htaccess file similar with WEB-INF directory in terms of configure server?)

What I have done so far,

Create a key pair: Public-Key and Private-Key

Calculate sha256: b3290c69a1...

Create update.rdf

<?xml version="1.0"?>
<r:RDF xmlns:r="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
        xmlns="http://www.mozilla.org/2004/em-rdf#">

<r:Description about="urn:mozilla:extension:myextension@mozilla.myextension.org">
    <updates>
    <r:Seq>
    <r:li>
    <r:Description>
        <version>1.0.1</version>
        <targetApplication>
            <r:Description>
            <id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</id>
            <minVersion>3.5</minVersion>
            <maxVersion>5.0.*</maxVersion>
            <updateLink>http://localhost:8080/myextension/pluginupdate/myextension.xpi</updateLink>
            <updateHash>
                sha256:b3290c69a1...
            </updateHash>
            </r:Description>
        </targetApplication>
    </r:Description>
    </r:li>
    </r:Seq>
    </updates>
</r:Description>

</r:RDF>

Sign update.rdf using Key

Place singed update.rdf and myextension.xpi under pluginupdate directory, where pluginupdate is on the same level with WEB-INF.

My install.rdf

<?xml version="1.0"?>

<RDF xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#" 

     xmlns:em="http://www.mozilla.org/2004/em-rdf#">


  <Description about="urn:mozilla:install-manifest">


    <em:id>myextension@mozilla.myextension.org</em:id>

    <em:name>My Test extension</em:name>

    <em:version>1.0</em:version>

    <em:description>Test Mozilla Extension.</em:description>

    <em:creator>TEST Group</em:creator>

    <!-- optional items -->

    <em:contributor>Me</em:contributor>

    <em:homepageURL>http://?????????/</em:homepageURL>

    <em:updateKey>

    MIGfMA0G.....

    </em:updateKey>

    <em:updateURL>http://localhost:8080/myextension/pluginupdate/update.rdf</em:updateURL>



    <!-- Firefox -->

    <em:targetApplication>

      <Description>

        <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>

        <em:minVersion>3.5</em:minVersion>

        <em:maxVersion>5.0.*</em:maxVersion>

      </Description>

    </em:targetApplication>


  </Description>


</RDF>

When i restart FF Browser, nothing happens. When I start FF Browser using command line with option -console

*** LOG addons.xpi: startup
*** LOG addons.xpi: checkForChanges
*** LOG addons.xpi: No changes found
*** LOG addons.xpi: Opening database

So, how can I host and configure Tomcat to host the update manifest? Thanks