yechao4j commented on issue #15059:
URL: https://github.com/apache/dubbo/issues/15059#issuecomment-2658124864
我把dubbo-service-discovery-extensions代码拷到本地了，运行后还是报错，有两个问题：
1.
`java.lang.IllegalStateException: Unsupported protocol rest in notified url:
DefaultServiceInstance{serviceName='spring-cloud-provider-for-dubbo',
host='172.20.160.102', port=8099, enabled=true, healthy=true,
metadata={preserved.register.source=SPRING_CLOUD,
IPv6=[2013:208:208:30:fcac:6456:35b8:5fc0]}}, null from registry
172.20.144.65:7788 to consumer 172.20.160.102, supported protocol: [dubbo,
grpc, injvm, mock, registry, rest2, service-discovery-registry, tri]`
SpringCloudServiceInstanceNotificationCustomizer里的protocol=rest不行，要改成rest2
2.改成rest2后，继续报错：
`java.lang.NullPointerException: Cannot invoke
"java.util.concurrent.atomic.AtomicReference.get()" because "this.channelRef"
is null
at
org.apache.dubbo.remoting.transport.netty4.AbstractNettyConnectionClient.getNettyChannel(AbstractNettyConnectionClient.java:259)
~[dubbo-3.3.3.jar:3.3.3]
at
org.apache.dubbo.remoting.transport.netty4.AbstractNettyConnectionClient.getChannel(AbstractNettyConnectionClient.java:251)
~[dubbo-3.3.3.jar:3.3.3]
at
org.apache.dubbo.remoting.transport.AbstractClient.disconnect(AbstractClient.java:306)
~[dubbo-3.3.3.jar:3.3.3]
at
org.apache.dubbo.remoting.transport.AbstractClient.close(AbstractClient.java:386)
~[dubbo-3.3.3.jar:3.3.3]
at
org.apache.dubbo.remoting.transport.AbstractClient.<init>(AbstractClient.java:82)
~[dubbo-3.3.3.jar:3.3.3]
at
org.apache.dubbo.remoting.api.connection.AbstractConnectionClient.<init>(AbstractConnectionClient.java:47)
~[dubbo-3.3.3.jar:3.3.3]
at
org.apache.dubbo.remoting.transport.netty4.AbstractNettyConnectionClient.<init>(AbstractNettyConnectionClient.java:63)
~[dubbo-3.3.3.jar:3.3.3]
at
org.apache.dubbo.remoting.transport.netty4.NettyConnectionClient.<init>(NettyConnectionClient.java:46)
~[dubbo-3.3.3.jar:3.3.3]
at
org.apache.dubbo.remoting.transport.netty4.NettyConnectionManager.connect(NettyConnectionManager.java:33)
~[dubbo-3.3.3.jar:3.3.3]
at
org.apache.dubbo.remoting.api.connection.SingleProtocolConnectionManager.createAbstractConnectionClient(SingleProtocolConnectionManager.java:68)
~[dubbo-3.3.3.jar:3.3.3]
at
org.apache.dubbo.remoting.api.connection.SingleProtocolConnectionManager.lambda$connect$0(SingleProtocolConnectionManager.java:52)
~[dubbo-3.3.3.jar:3.3.3]
at
java.base/java.util.concurrent.ConcurrentHashMap.compute(ConcurrentHashMap.java:1916)
~[?:?]
at
org.apache.dubbo.remoting.api.connection.SingleProtocolConnectionManager.connect(SingleProtocolConnectionManager.java:49)
~[dubbo-3.3.3.jar:3.3.3]
at
org.apache.dubbo.remoting.api.connection.MultiplexProtocolConnectionManager.connect(MultiplexProtocolConnectionManager.java:43)
~[dubbo-3.3.3.jar:3.3.3]
at
org.apache.dubbo.remoting.transport.netty4.NettyPortUnificationTransporter.connect(NettyPortUnificationTransporter.java:42)
~[dubbo-3.3.3.jar:3.3.3]
at
org.apache.dubbo.remoting.api.pu.PortUnificationTransporter$Adaptive.connect(PortUnificationTransporter$Adaptive.java)
~[dubbo-3.3.3.jar:3.3.3]
at
org.apache.dubbo.remoting.exchange.PortUnificationExchanger.connect(PortUnificationExchanger.java:64)
~[dubbo-3.3.3.jar:3.3.3]
at
org.apache.dubbo.rpc.protocol.tri.TripleProtocol.refer(TripleProtocol.java:190)
~[dubbo-3.3.3.jar:3.3.3]
at
org.apache.dubbo.qos.protocol.QosProtocolWrapper.refer(QosProtocolWrapper.java:85)
~[dubbo-3.3.3.jar:3.3.3]
at
org.apache.dubbo.rpc.protocol.ProtocolListenerWrapper.refer(ProtocolListenerWrapper.java:86)
~[dubbo-3.3.3.jar:3.3.3]
at
org.apache.dubbo.rpc.protocol.ProtocolSecurityWrapper.refer(ProtocolSecurityWrapper.java:112)
~[dubbo-3.3.3`
Please Help~~~
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