Expected single matching of application, but found 2 instances, will randomly pick the first one.

在项目启动时发现了警告日志信息意思是：dubbo发现了两个<dubbo:application name=“XXX”/> 实例，随机选择了第一个。

检查配置文件的确是配置了一个，经过Debug，发现在ConfigManger.getConfig(String configType) 方法来看，的确是有两个配置实例。

经过翻看Dubbo的issue，查看到这两个问题：

经过验证第一个问题在其后续的版本：2.7.16并没有解决其问题；

在第二个问题的讨论区发现有人询问上述问题（该问题虽不影响使用，但是对有代码洁癖的人有点。。。），然后其开发人员说在3.0.6 版本开始修复了此问题

https://github.com/apache/dubbo/issues/6461

https://github.com/apache/dubbo/issues/9656

dubbo:application 配置文档：
https://dubbo.apache.org/zh/docs/v2.7/user/references/xml/dubbo-application/

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