Hi,
For among others programmatically added listeners (eg. ServletContextListeners) several methods on ServletContext can't be called. For instance:
* @throws UnsupportedOperationException if this ServletContext was
* passed to the {@link ServletContextListener#contextInitialized} method
* of a {@link ServletContextListener} that was neither declared in
* <code>web.xml</code> or <code>web-fragment.xml</code>, nor annotated
* with {@link javax.servlet.annotation.WebListener}
*
* @since Servlet 3.1
*/
public String getVirtualServerName();
I wonder, what's the reason for this?
One can now obtain the virtual server name from a statically defined listener that is called before the dynamic filter and use it anyway.
Same holds for obtaining the ServletRegistrations. This is now forbidden as well, but a static listener can do this:
@WebListener public class MappingInit implements ServletContextListener {
@Override
public void contextInitialized(ServletContextEvent sce) {
sce.getServletContext().setAttribute("mappings", sce.getServletContext().getServletRegistrations());
}
}
And then the dynamic listener can pick these up, and use them to add e.g. mappings.
So what's the exact reason for the restriction?
Kind regards,
Arjan
