Because Meta Programming must be easy.

Reflecting

Reflecting a constructor by arguments (will return null if not found):
Class<T> clazz;
Constructor<T> c = new Mirror().on(clazz).reflect().constructor()
                        .withArgs(String.class, Object.class);
Reflecting all constructors of a class (will return an empty list if none found):
Class<T> clazz;
List<Constructor<T>> l = new Mirror().on(clazz).reflectAll().constructors();
Reflecting all constructors of a class that matches a Matcher<Constructor> (will return an empty list if none found):
Class<T> clazz;
List<Constructor<T>> l = new Mirror().on(clazz).reflectAll()
                                  .constructorsMatching(new YourCustomMatcher());