I am having problems using Spring Cloud Alibaba and Apache Dubbo (gRPC protocol) framework

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Which Component
我想在Spring Cloud Alibaba + Dubbo环境下使用grpc（ I want to use grpc in Spring Cloud Alibaba + Dubbo environment）

• Component Version：
  • Spring Boot：2.3.3.RELEASE
  • Spring Cloud：Hoxton.SR8
  • Spring Cloud Alibaba：2.2.3.RELEASE
  • Dubbo version: 2.7.8
    
    Describe what problem you have encountered
• 按照Dubbo官方提供的示例，能够正常启动Provider程序（According to the official example provided by Dubbo, the Provider program can be started normally）

  • 2020-12-26 22:11:13.403  INFO 19724 --- [           main] org.apache.dubbo.config.ServiceConfig    :  [DUBBO] Export dubbo service org.example.grpc.DubboFooServiceGrpc$IFooService to local registry url : injvm://127.0.0.1/org.example.grpc.DubboFooServiceGrpc$IFooService?anyhost=true&application=dubbo-grpc-provider&bind.ip=192.168.0.102&bind.port=50052&deprecated=false&dubbo=2.0.2&dynamic=true&generic=false&interface=org.example.grpc.DubboFooServiceGrpc$IFooService&methods=sayHello,sayHelloAsync&pid=19724&qos.enable=false&release=2.7.8&side=provider&timestamp=1608991873391, dubbo version: 2.7.8, current host: 192.168.0.102
    2020-12-26 22:11:13.403  INFO 19724 --- [           main] org.apache.dubbo.config.ServiceConfig    :  [DUBBO] Register dubbo service org.example.grpc.DubboFooServiceGrpc$IFooService url grpc://192.168.0.102:50052/org.example.grpc.DubboFooServiceGrpc$IFooService?anyhost=true&application=dubbo-grpc-provider&bind.ip=192.168.0.102&bind.port=50052&deprecated=false&dubbo=2.0.2&dynamic=true&generic=false&interface=org.example.grpc.DubboFooServiceGrpc$IFooService&methods=sayHello,sayHelloAsync&pid=19724&qos.enable=false&release=2.7.8&side=provider&timestamp=1608991873391 to registry registry://localhost:9090/org.apache.dubbo.registry.RegistryService?application=dubbo-grpc-provider&dubbo=2.0.2&pid=19724&qos.enable=false&registry=spring-cloud&release=2.7.8&timestamp=1608991873391, dubbo version: 2.7.8, current host: 192.168.0.102
    2020-12-26 22:11:13.495  INFO 19724 --- [           main] c.a.c.dubbo.registry.DubboCloudRegistry  :  [DUBBO] Register: grpc://192.168.0.102:50052/org.example.grpc.DubboFooServiceGrpc$IFooService?anyhost=true&application=dubbo-grpc-provider&deprecated=false&dubbo=2.0.2&dynamic=true&generic=false&interface=org.example.grpc.DubboFooServiceGrpc$IFooService&methods=sayHello,sayHelloAsync&pid=19724&release=2.7.8&side=provider&timestamp=1608991873391, dubbo version: 2.7.8, current host: 192.168.0.102
    2020-12-26 22:11:14.597  INFO 19724 --- [           main] o.s.cloud.commons.util.InetUtils         : Cannot determine local hostname
    2020-12-26 22:11:14.597  INFO 19724 --- [           main] c.a.c.dubbo.registry.DubboCloudRegistry  :  [DUBBO] Subscribe: provider://192.168.0.102:50052/org.example.grpc.DubboFooServiceGrpc$IFooService?anyhost=true&application=dubbo-grpc-provider&bind.ip=192.168.0.102&bind.port=50052&category=configurators&check=false&deprecated=false&dubbo=2.0.2&dynamic=true&generic=false&interface=org.example.grpc.DubboFooServiceGrpc$IFooService&methods=sayHello,sayHelloAsync&pid=19724&qos.enable=false&release=2.7.8&side=provider&timestamp=1608991873391, dubbo version: 2.7.8, current host: 192.168.0.102
    2020-12-26 22:11:14.604  INFO 19724 --- [           main] m.DynamicConfigurationServiceNameMapping :  [DUBBO] Dubbo service[null] mapped to interface name[org.example.grpc.DubboFooServiceGrpc$IFooService]., dubbo version: 2.7.8, current host: 192.168.0.102
    2020-12-26 22:11:14.613  INFO 19724 --- [           main] o.a.d.config.bootstrap.DubboBootstrap    :  [DUBBO] DubboBootstrap is ready., dubbo version: 2.7.8, current host: 192.168.0.102
    2020-12-26 22:11:14.613  INFO 19724 --- [           main] o.a.d.config.bootstrap.DubboBootstrap    :  [DUBBO] DubboBootstrap has started., dubbo version: 2.7.8, current host: 192.168.0.102
    2020-12-26 22:11:14.615  INFO 19724 --- [           main] o.example.ProviderBootstrapApplication   : Started ProviderBootstrapApplication in 11.68 seconds (JVM running for 12.447)

• 但是无法正常启动Consumer程序（But the Consumer program cannot be started normally）

  • Caused by: java.lang.IllegalStateException: Failed to subscribe consumer://192.168.0.102/org.example.grpc.DubboFooServiceGrpc$IFooService?application=dubbo-grpc-consumer&category=providers,configurators,routers&dubbo=2.0.2&init=false&interface=org.example.grpc.DubboFooServiceGrpc$IFooService&methods=sayHello,sayHelloAsync&pid=12136&qos.enable=false&release=2.7.8&side=consumer&sticky=false&timestamp=1608992011953, cause: null
        at org.apache.dubbo.registry.support.FailbackRegistry.subscribe(FailbackRegistry.java:350) ~[dubbo-2.7.8.jar:2.7.8]
        at org.apache.dubbo.registry.ListenerRegistryWrapper.subscribe(ListenerRegistryWrapper.java:105) ~[dubbo-2.7.8.jar:2.7.8]
        at org.apache.dubbo.registry.integration.RegistryDirectory.subscribe(RegistryDirectory.java:185) ~[dubbo-2.7.8.jar:2.7.8]
        at org.apache.dubbo.registry.integration.RegistryProtocol.doRefer(RegistryProtocol.java:469) ~[dubbo-2.7.8.jar:2.7.8]
        at org.apache.dubbo.registry.integration.RegistryProtocol.refer(RegistryProtocol.java:454) ~[dubbo-2.7.8.jar:2.7.8]
        at org.apache.dubbo.rpc.protocol.ProtocolListenerWrapper.refer(ProtocolListenerWrapper.java:72) ~[dubbo-2.7.8.jar:2.7.8]
        at org.apache.dubbo.rpc.protocol.ProtocolFilterWrapper.refer(ProtocolFilterWrapper.java:161) ~[dubbo-2.7.8.jar:2.7.8]
        at org.apache.dubbo.qos.protocol.QosProtocolWrapper.refer(QosProtocolWrapper.java:73) ~[dubbo-2.7.8.jar:2.7.8]
        at org.apache.dubbo.rpc.Protocol$Adaptive.refer(Protocol$Adaptive.java) ~[dubbo-2.7.8.jar:2.7.8]
        at org.apache.dubbo.config.ReferenceConfig.createProxy(ReferenceConfig.java:367) ~[dubbo-2.7.8.jar:2.7.8]
        at org.apache.dubbo.config.ReferenceConfig.init(ReferenceConfig.java:305) ~[dubbo-2.7.8.jar:2.7.8]
        at org.apache.dubbo.config.ReferenceConfig.get(ReferenceConfig.java:205) ~[dubbo-2.7.8.jar:2.7.8]
        at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor.doGetInjectedBean(ReferenceAnnotationBeanPostProcessor.java:144) ~[dubbo-2.7.8.jar:2.7.8]
        at com.alibaba.spring.beans.factory.annotation.AbstractAnnotationBeanPostProcessor.getInjectedObject(AbstractAnnotationBeanPostProcessor.java:362) ~[spring-context-support-1.0.10.jar:na]
        at com.alibaba.spring.beans.factory.annotation.AbstractAnnotationBeanPostProcessor$AnnotatedFieldElement.inject(AbstractAnnotationBeanPostProcessor.java:542) ~[spring-context-support-1.0.10.jar:na]
        at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:130) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
        at com.alibaba.spring.beans.factory.annotation.AbstractAnnotationBeanPostProcessor.postProcessPropertyValues(AbstractAnnotationBeanPostProcessor.java:145) ~[spring-context-support-1.0.10.jar:na]

  • Caused by: java.lang.NullPointerException: null
        at com.alibaba.cloud.dubbo.registry.DubboCloudRegistry.lambda$null$5(DubboCloudRegistry.java:293) ~[spring-cloud-starter-dubbo-2.2.3.RELEASE.jar:2.2.3.RELEASE]
        at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195) ~[na:na]
        at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195) ~[na:na]
        at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195) ~[na:na]
        at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1654) ~[na:na]
        at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) ~[na:na]
        at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) ~[na:na]
        at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) ~[na:na]
        at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) ~[na:na]
        at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:na]
        at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) ~[na:na]
        at com.alibaba.cloud.dubbo.registry.DubboCloudRegistry.lambda$cloneExportedURLs$6(DubboCloudRegistry.java:311) ~[spring-cloud-starter-dubbo-2.2.3.RELEASE.jar:2.2.3.RELEASE]
        at java.base/java.util.ArrayList.forEach(ArrayList.java:1540) ~[na:na]
        at com.alibaba.cloud.dubbo.registry.DubboCloudRegistry.cloneExportedURLs(DubboCloudRegistry.java:284) ~[spring-cloud-starter-dubbo-2.2.3.RELEASE.jar:2.2.3.RELEASE]
        at com.alibaba.cloud.dubbo.registry.DubboCloudRegistry.getExportedURLs(DubboCloudRegistry.java:265) ~[spring-cloud-starter-dubbo-2.2.3.RELEASE.jar:2.2.3.RELEASE]
        at com.alibaba.cloud.dubbo.registry.DubboCloudRegistry.subscribeURLs(DubboCloudRegistry.java:240) ~[spring-cloud-starter-dubbo-2.2.3.RELEASE.jar:2.2.3.RELEASE]
        at com.alibaba.cloud.dubbo.registry.DubboCloudRegistry.subscribeURLs(DubboCloudRegistry.java:227) ~[spring-cloud-starter-dubbo-2.2.3.RELEASE.jar:2.2.3.RELEASE]
        at com.alibaba.cloud.dubbo.registry.DubboCloudRegistry.lambda$subscribeURLs$2(DubboCloudRegistry.java:206) ~[spring-cloud-starter-dubbo-2.2.3.RELEASE.jar:2.2.3.RELEASE]

    
    
    Describe what information you have read
    

我提供了一个GitHub地址（provided a GitHub address）

• spring-cloud-dubbo-grpc

[github-ganyu]

Could it be a bug of SpringCloudAlibaba?