今天处理了一个dubb升级造成的包冲突，记录下，希望能帮到一些有同样问题的小伙伴，并且将自己解决包冲突的想法总结下
背景：
因为dubbo出现安全漏洞，公司的安全组要求将dubbo的版本由2.7.3-SNAPSHOT 升级到 2.7.3.7-RELEASE
问题：
因为是依赖的组件中引用了低版本的dubbo，所以想着在该组件中使用 exclusions的方式排除掉，然后引入最近版本的dubbo，一顿操作之后没想到报了一个错如下，然后就开始我的排错之旅
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2023-04-19 16:05:49.219 INFO 19451 --- [ restartedMain] .b.c.e.AwaitingNonWebApplicationListener : [Dubbo] Current Spring Boot Application is about to shutdown...
2023-04-19 16:05:49.228 ERROR 19451 --- [ restartedMain] o.s.b.d.LoggingFailureAnalysisReporter :
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APPLICATION FAILED TO START
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Description:
An attempt was made to call a method that does not exist. The attempt was made from the following location:
org.redisson.connection.DnsAddressResolverGroupFactory.create(DnsAddressResolverGroupFactory.java:33)
The following method did not exist:
io.netty.resolver.dns.DnsAddressResolverGroup.<init>(Ljava/lang/Class;Lio/netty/resolver/dns/DnsServerAddressStreamProvider;)V
The method's class, io.netty.resolver.dns.DnsAddressResolverGroup, is available from the following locations:
jar:file:/Users/zhangruibiao/Downloads/maven_repo/org/asynchttpclient/netty-resolver-dns/2.0.36/netty-resolver-dns-2.0.36.jar!/io/netty/resolver/dns/DnsAddressResolverGroup.class
jar:file:/Users/zhangruibiao/Downloads/maven_repo/io/netty/netty-all/4.1.43.Final/netty-all-4.1.43.Final.jar!/io/netty/resolver/dns/DnsAddressResolverGroup.class
jar:file:/Users/zhangruibiao/Downloads/maven_repo/io/netty/netty-resolver-dns/4.1.43.Final/netty-resolver-dns-4.1.43.Final.jar!/io/netty/resolver/dns/DnsAddressResolverGroup.class
It was loaded from the following location:
file:/Users/zhangruibiao/Downloads/maven_repo/org/asynchttpclient/netty-resolver-dns/2.0.36/netty-resolver-dns-2.0.36.jar
Action:
Correct the classpath of your application so that it contains a single, compatible version of io.netty.resolver.dns.DnsAddressResolverGroup
Disconnected from the target VM, address: '127.0.0.1:49930', transport: 'socket'
Process finished with exit code 0从错误中可以大概得到信息：尝试创建 DnsAddressResolverGroupFactory，但是方法不存在，这个方法有用的类来自于下边的三个jar包
分析：
①因为不能创建 DnsAddressResolverGroupFactory ，所以可以现在源码中找到该类，
通过方框中可以看到，该构造方法是报错的，并且提示不能解析改构造方法
②再点开这个构造函数
框中的构造函数的参数类型和调用的构造函数的参数类型不一致， 问题就出在这里
解决方法
①当前构造方法引用的jar包
②因为之前项目启动是没有问题，所有参考之前的引用
③根据对比和报错的提示，应该出现在 netty-resolver-dns-2.0.36.jar 这个jar包，在组件中应该也需要排除 netty-resolver-dns-2.0.36.jar 的引用
④启动之后发现仍然有问题，根据提示应该也需要排除 async-http-client-2.0.36.jar
⑤启动成功
