code: public static Field getField(Class<?> type, String fieldName) {
  		return WhiteboxImpl.getField(type, fieldName);
  	}
docs: Convenience method to get a field from a class type.
  <p>
  The method will first try to look for a declared field in the same class.
  If the field is not declared in this class it will look for the field in
  the super class. This will continue throughout the whole class hierarchy.
  If the field is not found an {@link IllegalArgumentException} is thrown.
  
  @param type
  The type of the class where the method is located.
  @param fieldName
  The method names.
  @return A {@code java.lang.reflect.Field}.
  @throws FieldNotFoundException
  If a field cannot be found in the hierarchy.