carryxyh commented on issue #2539: When adding @Referenc in Multicast registry, deadlock happened. URL: https://github.com/apache/incubator-dubbo/issues/2539#issuecomment-423105964 The log is already obvious. When the main thread initializes the spring container, it locks org.springframework.beans.factory.support.DefaultSingletonBeanRegistry#singletonObjects and then tries to lock a RegistryDirectory when executing MulticastRegistry.doSubscribe. The DubboMulticastRegistryReceiver thread locks the RegistryDirectory when it is in MulticastRegistry.receive. When it gets the bean, it tries to lock org.springframework.beans.factory.support.DefaultSingletonBeanRegistry#singletonObjects and deadlock. So it seems that we need to synchronize the execution of MulticastRegistry.this.receive in the MulticastRegistry to eliminate deadlock.
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