JSF - Unknown attribute type (void) for attribute actionList

[hendi.sumarna]

when I deploy the duke's bookstore application(bookstore6) on jboss 4.2.3.GA, it doesn't work. The application comes from the javaee tutorial on Sun's web site.
the error comes out in custom tag <deferred-method> where the signature is void.
<deferred-method>
<method-signature>void actionListener(javax.faces.event.ActionEvent)</method-signature>
</deferred-method>

anyone know why?

thanks