A novice learner Dubbo, has this problem when integrating Spring-boot to do Demo.
the service provider can start normally, but the caller failed to start. Multiple attempts are inexplicable and cannot be solved. Passers-by point out the problem.
Let"s release the code

error content

2018-08-05 19:02:26.974  INFO 10060 --- [           main] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with "debug" enabled.
Disconnected from the target VM, address: "127.0.0.1:1956", transport: "socket"
2018-08-05 19:02:27.052 ERROR 10060 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

***************************
APPLICATION FAILED TO START
***************************

Description:

Field helloService in cn.mrthree.dubbo.HelloController required a bean of type "cn.mrthree.dubbo.HelloService" that could not be found.


Action:

Consider defining a bean of type "cn.mrthree.dubbo.HelloService" in your configuration.

provider ServiceImpl

import org.springframework.stereotype.Service;
@Service("helloService")
public class HelloServiceImpl implements HelloService {
    @Override
    public String sayHello(String name) {
        return "Hello " + (name == null ? "World" : name);
    }
}

provider configuration

srping:
  dubbo:
    application: -sharp
      name: hello-service
    registry: -sharp
      address: zookeeper://192.168.1.102:2181
    protocol:  -sharp
      name: dubbo
      port: 20880
    service:
      interface: cn.mrthree.dubbo.HelloService
      ref: helloService
server:
  port: 8880

caller Controller

package cn.mrthree.dubbo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class HelloController {
    @Autowired
    private HelloService helloService;
    @GetMapping("hello")
    public String hello(@RequestParam(value="name", required = false) String name){
        return helloService.sayHello(name);
    }
}

caller configuration

srping:
  dubbo:
    application: -sharp
      name: hello-consumer
    registry: -sharp
      address: zookeeper://192.168.1.102:2181
    base-package: cn.mrthree.dubbo
    reference:
      id: helloService
      interface: cn.mrthree.dubbo.HelloService
server:
  port: 8881
  servlet:
    context-path: /dubbo-consumer