dubbo version: 2.7.3
os version: Windows 10
jdk version: 1.8
I met a problem when I learn to use the "url" config in dubbo:reference. I
choose zookeeper as registry.
I have these codes in my provider.
```java
interface GreetingService {
String sayHello(String name);
}
class GreetingServiceImpl implements GreetingService {
String sayHello(String name) {
return "hello, " + name;
}
}
```
I have these configs in my provider.xml
```xml
<bean id="target1" class="com.....GreetingServiceImpl" />
<bean id="target2" class="com.....GreetingServiceImpl" />
<dubbo:service interface="com....GreetingService" ref="target1" group="group1"
version="2.0.0"/>
<dubbo:service interface="com...GreetingService" ref="target2" group="group2"
version="2.0.0" />
```
Situation 1.
In this case, the consumer will work.
```xml
<dubbo:reference check="false"
url="dubbo://127.0.0.1:20880?group=group1&version=2.0.0"
id="mergerService"
interface="com.maslke.dubbo.samples.merger.api.MergerService" group="group1"
version="2.0.0" />
```
Situation 2.
In this case, the consumer will not work. It will throw an exception like this
"Not found exported service".
```xml
<dubbo:reference check="false"
url="dubbo://127.0.0.1:20880?group=group2&version=2.0.0"
id="mergerService"
interface="com.maslke.dubbo.samples.merger.api.MergerService" group="group2"
version="2.0.0" />
```
Situation3.
I modify my provider.xml and add id to dubbo:service.
```xml
<bean id="target1" class="com.....GreetingServiceImpl" />
<bean id="target2" class="com.....GreetingServiceImpl" />
<dubbo:service id="greetingService" interface="com....GreetingService"
ref="target1" group="group1" version="2.0.0"/>
<dubbo:service id="greetingServic2" interface="com...GreetingService"
ref="target2" group="group2" version="2.0.0" />
```
If I do this，situation 1 and situation 2 will both work correctly.
So here is the question.
1) Is this a bug?
2) if this is not a bug, so id is necessary in my situation?
[ Full content available at: https://github.com/apache/dubbo/issues/5089 ]
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