RongtongJin commented on issue #128: ListenerContainerConfiguration.java set nameServer but RocketMQMessageListener already have PLACEHOLDER URL: https://github.com/apache/rocketmq-spring/issues/128#issuecomment-552851721 如果用户在注解中设置了无效（Empty）的namServer，则从rocketMQProperties中获取，否则从注解中获取。
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