apollo-client/src/main/java/com/ctrip/framework/apollo/spring/property/SpringValue.java/SpringValue/injectMethod
class SpringValue:  private void injectMethod(Object newVal)
      throws InvocationTargetException, IllegalAccessException {
    Object bean = beanRef.get();
    if (bean == null) {
      return;
    }
    methodParameter.getMethod().invoke(bean, newVal);
  }