houseyoung opened a new issue #8638:
URL: https://github.com/apache/dubbo/issues/8638
使用dubbo 2.7.13作为客户端时（2.7.10、2.7.12也都试过），reference注册时报出如下异常：
Failed to notify addresses for subscribe
consumer://172.20.9.10/XXXXXX?application=YYYYY&category=providers,configurators,routers&check=false&dubbo=2.0.2&init=false&interface=ZZZZZ&metadata-type=remote&methods=AAA,BBB,CCC&pid=1&release=2.7.13&revision=1.0.3-rel-SNAPSHOT&side=consumer&sticky=false&timeout=6000×tamp=1630303343085,
cause: null, dubbo version: 2.7.13, current host: 172.20.9.10
java.lang.NullPointerException: null
at org.apache.dubbo.common.URL.equals(URL.java:1693)
at java.util.HashMap.getNode(HashMap.java:572) at
java.util.HashMap.containsKey(HashMap.java:596) at
java.util.HashSet.contains(HashSet.java:204) at
org.apache.dubbo.registry.integration.RegistryDirectory.toInvokers(RegistryDirectory.java:312)
at
org.apache.dubbo.registry.integration.RegistryDirectory.refreshInvoker(RegistryDirectory.java:190)
at
org.apache.dubbo.registry.integration.RegistryDirectory.refreshOverrideAndInvoker(RegistryDirectory.java:150)
at
org.apache.dubbo.registry.integration.RegistryDirectory.notify(RegistryDirectory.java:132)
at
org.apache.dubbo.registry.support.AbstractRegistry.notify(AbstractRegistry.java:429)
at
org.apache.dubbo.registry.support.FailbackRegistry.doNotify(FailbackRegistry.java:372)
1693行是if (!parameters.get(key).equals(other.parameters.get(key))) {
我理解这个地方是不可能出现npe的，而且这个报错不是所有reference都出现，只有其中几个reference出现了，而且在其他环境无法复现…请教可能是什么问题？
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