- [ ] 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: apache-dubbo-2.7.4.1
* Operating System version: mac os
* Java version: jdk1.8.0_211
### Steps to reproduce this issue
1. when running demo dubbo-demo-xml-provider a null pointer appears
```
[27/12/19 00:41:45:876 CST] main INFO config.AbstractConfig: [DUBBO] The
service ready on spring started. service: org.apache.dubbo.demo.DemoService,
dubbo version: , current host: 192.168.0.100
Exception in thread "main" java.lang.NullPointerException
at
org.apache.dubbo.config.AbstractInterfaceConfig.lambda$null$7(AbstractInterfaceConfig.java:632)
at java.util.Optional.orElseGet(Optional.java:267)
at
org.apache.dubbo.config.AbstractInterfaceConfig.lambda$useRegistryForConfigIfNecessary$8(AbstractInterfaceConfig.java:620)
at java.util.Optional.ifPresent(Optional.java:159)
at
org.apache.dubbo.config.AbstractInterfaceConfig.useRegistryForConfigIfNecessary(AbstractInterfaceConfig.java:618)
at
org.apache.dubbo.config.AbstractInterfaceConfig.checkRegistry(AbstractInterfaceConfig.java:208)
at
org.apache.dubbo.config.ServiceConfig.checkAndUpdateSubConfigs(ServiceConfig.java:303)
at org.apache.dubbo.config.ServiceConfig.export(ServiceConfig.java:370)
at
org.apache.dubbo.config.spring.ServiceBean.export(ServiceBean.java:336)
at
org.apache.dubbo.config.spring.ServiceBean.onApplicationEvent(ServiceBean.java:114)
at
org.apache.dubbo.config.spring.ServiceBean.onApplicationEvent(ServiceBean.java:60)
at
org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
at
org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
at
org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
at
org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:393)
at
org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:347)
at
org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:883)
at
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546)
at
org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
at
org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
at org.apache.dubbo.demo.provider.Application.main(Application.java:30)
[27/12/19 00:41:45:950 CST] Thread-0 INFO
support.ClassPathXmlApplicationContext: Closing
org.springframework.context.support.ClassPathXmlApplicationContext@2d363fb3:
startup date [Fri Dec 27 00:41:44 CST 2019]; root of context hierarchy
[27/12/19 00:41:45:955 CST] Thread-0 INFO support.AbstractRegistryFactory:
[DUBBO] Close all registries [], dubbo version: , current host: 192.168.0.100
```
[ Full content available at: https://github.com/apache/dubbo/issues/5543 ]
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