Spring @RequestMapping Controller Forwarding

@RequestMapping({"/someurl"})
public String execute(Model model) {
    if (someCondition) {
        return "forward:/someUrlA";
    } else {
        return "forward:/someUrlB";
    }
}

Im trying to forward request from a controller to another controller. When I run this the controller returns string as response instead of forwarding to the other controller... Can someone please point out what I'm missing?

Thanks!!