delete version number in url

How can I delete or hide the version number in the URL introduced in Wicket 1.5?

Mounting a page doesn't help.

http://localhost/MyPage/SubPage?0

In Application.init():

mount(new MountedMapperWithoutPageComponentInfo("/subpage", MyPage.class));

with the following Mapper class:

public class MountedMapperWithoutPageComponentInfo extends MountedMapper {

  public MountedMapperWithoutPageComponentInfo(String mountPath, Class<? extends IRequestablePage> pageClass) {
    super(mountPath, pageClass, new PageParametersEncoder());
  }

  @Override
  protected void encodePageComponentInfo(Url url, PageComponentInfo info) {
    // do nothing so that component info does not get rendered in url
  }

  @Override 
  public Url mapHandler(IRequestHandler requestHandler) 
  { 
      if (requestHandler instanceof ListenerInterfaceRequestHandler ||
                requestHandler instanceof BookmarkableListenerInterfaceRequestHandler) { 
          return null; 
      } else { 
           return super.mapHandler(requestHandler); 
      } 
  } 
}