spring boot redis和netty5.0.2冲突

今天用spring boot集成netty时候，刚开始挺顺利的，但是在引入

   <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>

之后，一切都变的不美好了，启动的时候会出现如下错误

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:141)

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:/C:/work/maven/mymaven/repo/io/netty/netty-all/5.0.0.Alpha2/netty-all-5.0.0.Alpha2.jar!/io/netty/util/concurrent/DefaultEventExecutorGroup.class
    jar:file:/C:/work/maven/mymaven/repo/io/netty/netty-common/4.1.45.Final/netty-common-4.1.45.Final.jar!/io/netty/util/concurrent/DefaultEventExecutorGroup.class

It was loaded from the following location:

    file:/C:/work/maven/mymaven/repo/io/netty/netty-all/5.0.0.Alpha2/netty-all-5.0.0.Alpha2.jar

刚开始看的时候一脸懵逼的，我这里也没有隐去netty4.1.45的版本，因为netty4和netty5的差别还是蛮的，往上一看，是lettuce的问题，lettuce不用说肯定是redis引入的，然后发现redis果然引入了

<!-- https://mvnrepository.com/artifact/io.lettuce/lettuce-core -->
<dependency>
    <groupId>io.lettuce</groupId>
    <artifactId>lettuce-core</artifactId>
    <version>5.1.8.RELEASE</version>
</dependency>

而lettuce又关联了

       <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty-common</artifactId>
        </dependency>
        <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty-handler</artifactId>
        </dependency>
        <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty-transport</artifactId>
        </dependency>

出现这种情况我第一反应是屏蔽，然后强制的指定版本。

第一次的做法是直接屏蔽lettuce

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>io.netty</groupId>
                    <artifactId>lettuce-core</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

这样是解决了上面的问题，但是导致了redis无法完成bean注入，出现RedisConnectFactory找不到的情况，所以直接放弃，改用下面的屏蔽方法。

  <!-- https://mvnrepository.com/artifact/io.netty/netty-all -->
        <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty-common</artifactId>
            <version>5.0.0.Alpha2</version>
        </dependency>
        <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty-handler</artifactId>
            <version>5.0.0.Alpha2</version>
        </dependency>
        <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty-transport</artifactId>
            <version>5.0.0.Alpha2</version>
        </dependency>
        <!-- 提高redis的版本-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>io.netty</groupId>
                    <artifactId>netty-common</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>io.netty</groupId>
                    <artifactId>netty-handler</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>io.netty</groupId>
                    <artifactId>netty-transport</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

然并卵，问题依旧没解决，最后没办法了，我就只能降低netty的版本了。

<!-- https://mvnrepository.com/artifact/io.netty/netty-all -->
<dependency>
    <groupId>io.netty</groupId>
    <artifactId>netty-all</artifactId>
    <version>4.1.45.Final</version>
</dependency>

和lettuce-core的版本中的netty版本保持一致，问题解决。其实还是蛮坑的，毕竟netty4和netty5的代码实现还是有很大的差别的，只能去改动一下实现代码了

zhuwei_clark

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spring boot redis和netty5.0.2冲突

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