Tomcat deployment from public_html user folder of a war application is not working

[Manuel Parra]

Hello I'm trying to deploy .war application from the public_html folder at
user homes.

I've added directive to server.xml :

<Listener className="org.apache.catalina.startup.UserConfig"
directoryName="public_html"
userClass="org.apache.catalina.startup.PasswdUserDatabase"/>

And I try :

http://localhost:8080/~usertest/app

And it return :

404 error

Then I try :

http://localhost:8080/~usertest/app.war

It download app.war but it doesn't serve the app.

User home contains folder :

public_html/app.war

So, what is the problem?

 I'm using tomcat 7

Thanks in advance.