- [x] I have searched the [issues](https://github.com/apache/dubbo/issues) of
this repository and believe that this is not a duplicate.
- [x] 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: mac 10.15
* Java version: 1.8
### Steps to reproduce this issue
1. Spring start app
```java
@SpringBootApplication
@EnableDubbo(multipleConfig = false)
public class RunApp {
}
```
2. application.yml
```yml
dubbo:
protocol:
register: false
```
3. start RunApp
### Expected Result
Providers don't register to registry center
### Actual Result
Providers registered to registry center.
Checked from dubbo admin
### Problems
http://dubbo.apache.org/en-us/docs/user/references/xml/dubbo-service.html
Attribute `register` is not required, should be null when not set.
The default value in @Service is `true` in v2.7.3.
#### v2.6.2
com.alibaba.dubbo.config.annotation.Service
```java
boolean register() default false;
```
#### v2.7.3
org.apache.dubbo.config.annotation.Service
```java
/**
* Whether to register the service to register center, default value is true
*/
boolean register() default true;
```
ServiceBean.register default value is true。
org.apache.dubbo.config.ServiceConfig
```java
doExportUrlsFor1Protocol(ProtocolConfig protocolConfig, List<URL> registryURLs){
......
appendParameters(map, provider);
appendParameters(map, protocolConfig);
appendParameters(map, this);// default: this.register=true (unset on @Service)
......
}
```
[ Full content available at: https://github.com/apache/dubbo/issues/5583 ]
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