一、问题出现，使用Netty5报错
Description:
An attempt was made to call a method that does not exist. The attempt was made from the following location:
io.lettuce.core.resource.DefaultEventLoopGroupProvider.createEventLoopGroup(DefaultEventLoopGroupProvider.java:198)
The following method did not exist:
io.netty.util.concurrent.DefaultEventExecutorGroup.<init>(ILjava/util/concurrent/ThreadFactory;)V
The method's class, io.netty.util.concurrent.DefaultEventExecutorGroup, is available from the following locations:
jar:file:/Users/test/.gradle/caches/modules-2/files-2.1/io.netty/netty-all/5.0.0.Alpha2/9870d1ff5e71352077776a255f9d1494486af16/netty-all-5.0.0.Alpha2.jar!/io/netty/util/concurrent/DefaultEventExecutorGroup.class
jar:file:/Users/test/.gradle/caches/modules-2/files-2.1/io.netty/netty-common/4.1.50.Final/d2059030b86733c52fd999e63db7300414b487fa/netty-common-4.1.50.Final.jar!/io/netty/util/concurrent/DefaultEventExecutorGroup.class
The class hierarchy was loaded from the following locations:
io.netty.util.concurrent.DefaultEventExecutorGroup: file:/Users/test/.gradle/caches/modules-2/files-2.1/io.netty/netty-all/5.0.0.Alpha2/9870d1ff5e71352077776a255f9d1494486af16/netty-all-5.0.0.Alpha2.jar
io.netty.util.concurrent.MultithreadEventExecutorGroup: file:/Users/test/.gradle/caches/modules-2/files-2.1/io.netty/netty-all/5.0.0.Alpha2/9870d1ff5e71352077776a255f9d1494486af16/netty-all-5.0.0.Alpha2.jar
io.netty.util.concurrent.AbstractEventExecutorGroup: file:/Users/test/.gradle/caches/modules-2/files-2.1/io.netty/netty-all/5.0.0.Alpha2/9870d1ff5e71352077776a255f9d1494486af16/netty-all-5.0.0.Alpha2.jar
Action:
Correct the classpath of your application so that it contains a single, compatible version of io.netty.util.concurrent.DefaultEventExecutorGroup
