code: public static <T> boolean hasConverter(Class<T> clazz) {
        if (clazz == null) {
           return false;
        } else if (converters.containsKey(clazz)) {
           return true;
        }
        return clazz.isArray() && converters.containsKey(clazz.getComponentType());
     }
docs: Has converter.
  
  @param <T>   the type parameter
  @param clazz the clazz
  @return the boolean