springboot+dubbo 提供者 未启动 消费者 启动报错?报错

最近刚开始接触dubbo，于是自己搭建了一个spring boot+dubbo 的项目，相关细节不是太熟悉，过程中遇到了几个问题，

直接说问题：错误如下

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userControllet': Unsatisfied dependency expressed through field 'userIntegration'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userIntegration' defined in file [E:\Documents\project\idea-git\dubbodemo\userdemo\user-service\target\classes\org\song\rpc\dubbo\integration\UserIntegration.class]: Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanInitializationException: Failed to init remote service reference at filed bookResource in class org.song.rpc.dubbo.integration.UserIntegration; nested exception is java.lang.IllegalStateException: Failed to check the status of the service org.song.rpc.dubbo.resource.BookResource. No provider available for the service org.song.rpc.dubbo.resource.BookResource:1.0.0 from the url zookeeper://127.0.0.1:2181/com.alibaba.dubbo.registry.RegistryService?application=dubbo-user&default.loadbalance=roundrobin&dubbo=2.8.4&interface=org.song.rpc.dubbo.resource.BookResource&methods=getAllBooks&pid=11760&revision=1.0.0&side=consumer&timestamp=1503911603298&version=1.0.0 to the consumer 10.100.142.104 use dubbo version 2.8.4

• springboot 1.5.6
• dubbo
• zookeeper
• mybatis+mysql  这个可以忽略

项目目录结构

这里的userdemo和bookdemo相互是提供者和消费者，

只要启动无论哪一个，都会报错如上，springboot启动失败，这时候我将消费注释掉

//    @Reference(version = "1.0.0", consumer = "defaultConsumer")
//    private UserResource userResource;
//
//    public List<UserDTO> getUsers(){
//        return userResource.getAllUsers();
//    }

启动就成功了，这时候再启动另一个，也成功了。

问题：

是不是缺少什么配置？让服务启动的时候，即使没有提供者也不会报错，等提供者启动完成然后在建立关系？