Spring AOP only works for spring beans. You should define the intercepted object as a bean in the spring config file, get it from the context and invoke method on it.
This is the part that is not correct.
Intercepted intercepted = new Intercepted();
intercepted.interceptMe();
Add this to the xml file
And then retreive the instance from the spring ctx
ApplicationContext ctx = // create context using the config file
intercepted = ctx.getBean("intercepted",Intercepted.class);
intercepted.interceptMe();