[GitHub] [dubbo] haiyang1985 opened issue #5049: support specify protocol for Service annotation

["haiyang1985 (GitHub)" <gi...@apache.org>]

- [ ] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.
- [ ] I have checked the [FAQ](https://github.com/apache/dubbo/blob/master/FAQ.md) of this repository and believe that this is not a duplicate.

### Environment

* Dubbo version: 2.7.3
* Operating System version: macOs sierra
* Java version: 1.8

### Steps to reproduce this issue

1. define two dubbo protocols with different port, like below.
```
@Configuration
public class DubboConfiguration {

  @Bean
  public ProtocolConfig config1() {
    ProtocolConfig config = new ProtocolConfig();
    config.setId("dubbo1");
    config.setName("dubbo");
    config.setPort(20880);
    return config;
  }

  @Bean
  public ProtocolConfig config2() {
    ProtocolConfig config = new ProtocolConfig();
    config.setId("dubbo2");
    config.setName("dubbo");
    config.setPort(20770);
    return config;
  }
}
```
2. specify dubbo bean id "dubbo1" as Service annotation protocol, but not spring bean name "config1".
```
@Service(protocol = "dubbo1")
```
3. startup the provider and see output log, and see application failed to start without dubbo1 protocol.

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

Description:

A component required a bean named 'dubbo1' that could not be found.
```

If we are specify config1 as the protocol, the application can start up succeed. When ServiceBean initialize, it will get reference bean from spring, cannot recognize dubbo properties.
@Service(protocol = "config1")

Pls. provide [GitHub address] to reproduce this issue.

### Expected Result

The application start up succeed.

### Actual Result

The application start up failed without dubbo1 protocol.

[ Full content available at: https://github.com/apache/dubbo/issues/5049 ]
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