Turns out there is another problem which needs addressing. The problem lies in ReflectionHelper#haveSameSignature.
Assuming:

public static abstract class Service<T> {
		public abstract void doSomething(T t);
	}

	public static class ServiceImpl extends Service<String> {
		public void doSomething(String s) {
		}

		public void doSomething(Integer i) {
		}
	}

In our case ServiceImpl#doSomething(String) is not recognized as a overriding method of Service#doSomething(T). It turns out that this not an easy problem to solve using generics. See also

• http://stackoverflow.com/questions/12133817/determining-if-a-method-overrides-another-at-runtime
• http://stackoverflow.com/questions/12154731/is-the-jls-complete-regaring-method-overriding-and-generics?lq=1