docs: public final static void classAvailable(Class<?> clazz) {
          Object target = classAvailableTarget;
          Method method = classAvailableMethod;
          if (target == null || method == null) {
              return;
          }
          try {
              method.invoke(target, clazz);
          } catch (Throwable t) {
              t.printStackTrace();
          }
      }