Say I have an interface:

public interface Transaction<ArgType, ResultType> {
  public Future<ResultType> run (ArgType argument);
}

and I implement or override methods using hints, on a concrete type, I get the generic names as my parameters - i.e. 
public class X implements Transaction<Properties, File> {
  public Future<File> run (Properties argument) { ... }
}

I will either get "argument" or "argtype" as the variable name on the implementation of run().  It probably should be "properties" - at any rate, "argtype" will always not desirable.