How do you stop directory listings in JBoss?

When the http requests maps to a physical directory location within a deployed war file, the contents of that directory are listed in the response. How can this default behavior be stopped, so that a 'resource not found' or other similar exception is thrown.

On tomcat the following entry in web.xml should work.

<init-param>
 <param-name>listings</param-name>
 <param-value>false</param-value>
</init-param>