slankka commented on issue #15040:
URL: https://github.com/apache/dubbo/issues/15040#issuecomment-3580646126
# Fix No Provider available in some case
Version: dubbo 3.2.6
## Base case:
```java
RegistryConfig hzRegistry = new
RegistryConfig("nacos://127.0.0.2:8848?group=DUBBO");
ReferenceConfig<DemoService> reference = new ReferenceConfig<>();
reference.setInterfaceClass(DemoService.class);
reference.setVersion("1.0");
reference.setRegistry(hzRegistry)
DemoService refer = refercence.get();
refer.hello();
```
## ConfigCenterAdded
```java
ConfigCenterConfig configCenter = new ConfigCenterConfig();
configCenter.setAddress("nacos://127.0.0.2:8848?group=DUBBO");
reference.getApplicationModel().getConfigManager().addConfigCenter(configCenter)
```
## JVM property set
```java
System.setProperty("dubbo.registry.address",
"nacos://127.0.0.2:8848?group=DUBBO");
ReferenceConfig<DemoService> reference = new ReferenceConfig<>();
reference.setInterfaceClass(DemoService.class);
reference.setVersion("1.0");
DemoService refer = refercence.get();
refer.hello();
```
## Bootstrap
```
RegistryConfig hzRegistry = new
RegistryConfig("nacos://127.0.0.2:8848?group=DUBBO");
ReferenceConfig<GreetingsService> reference =
ReferenceBuilder.<GreetingsService>newBuilder()
.interfaceClass(GreetingsService.class)
.version("1.0")
.build();
DubboBootstrap.getInstance()
.reference(reference)
.registry(hzRegistry)
.configCenter(configCenter) //add or absent
.start();
GreetingsService service = reference.get();
service.greeting();
```
## Conclustion
|Case| Key| Result |
|-----|-----|------|
|Base case | ERR | No Provider available |
|Base case + ConfigCenterAdded| OK| OK|
|JVM property set| OK| OK|
|Bootstrap: ConfigCenter: absent | ERR | No Provider available|
|Bootstrap + ConfigCenter: Added| OK | OK|
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