static <S> List<Class<S>> getAllExtensionClass(Class<S> service) {
        return InnerEnhancedServiceLoader.getServiceLoader(service).getAllExtensionClass(findClassLoader(), true);
    }
@Test
    public void getAllExtensionClass1() {
        List<Class<Hello>> allExtensionClass = EnhancedServiceLoader
                .getAllExtensionClass(Hello.class, ClassLoader.getSystemClassLoader());
        assertThat(allExtensionClass).isNotEmpty();
    }