I'm afraid I don't understand the problem. Spring doesn't bring any magic to the application. You want to get a reference to particular object (via its id) and call specific method. Spring doesn't offer any special support for that because it may be done via couple of lines using Reflection API code. Something like:
It's already very simple and I don't see the necessity of any additional support from the Spring for that.
Object bean = context.getBean("xxx");
Method method = MyClass.class.getMethod("methodName");