code: public static <P extends Parameterizable> Set<P> getParameterizables(Package javaPackage, Class<P> clazz) throws IOException, FileNotFoundException, ClassNotFoundException, InstantiationException, IllegalAccessException, NoSuchMethodException, InvocationTargetException {
        Set<P> parameterizables = new HashSet<>(50);
        for (Class<?> c : ClassHelper.fromPackage(javaPackage)) {
           if (clazz.isAssignableFrom(c) && !Modifier.isAbstract(c.getModifiers())) {
              P p = (P) c.newInstance();
              ParamAnnotationProcessor.PAP.initParameters(p);
              parameterizables.add(p);
           }
        }
        return parameterizables;
     }
docs: Use this generic method in for example a gui that supports building a styling file.
  
  @param <P>
  @param javaPackage
  @param clazz
  @return
  @throws IOException
  @throws FileNotFoundException
  @throws ClassNotFoundException
  @throws InstantiationException
  @throws IllegalAccessException
  @throws NoSuchMethodException
  @throws InvocationTargetException