当依赖物有Spring云启动器侦察时，莴苣抛出NPE

Question

我使用spring会话数据redis来管理会话。它将在每次请求之前从redis获取会话数据。但当从redis获取会话时，它会抛出一个NPE。如果我删除SpringCloudStarterSleuth依赖项，它就不会发生。

springboot版本：2.3。8.释放

springcloud版本：霍克斯顿。SR10

以下是例外信息：

java.lang.NullPointerException: null
    at io.lettuce.core.protocol.CommandHandler.writeSingleCommand(CommandHandler.java:426) ~[lettuce-core-5.3.6.RELEASE.jar:5.3.6.RELEASE]
    at io.lettuce.core.protocol.CommandHandler.write(CommandHandler.java:378) ~[lettuce-core-5.3.6.RELEASE.jar:5.3.6.RELEASE]
    at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:717) ~[netty-transport-4.1.58.Final.jar:4.1.58.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:764) ~[netty-transport-4.1.58.Final.jar:4.1.58.Final]
    at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:790) ~[netty-transport-4.1.58.Final.jar:4.1.58.Final]
    at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:758) ~[netty-transport-4.1.58.Final.jar:4.1.58.Final]
    at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:808) ~[netty-transport-4.1.58.Final.jar:4.1.58.Final]
    at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:1025) ~[netty-transport-4.1.58.Final.jar:4.1.58.Final]
    at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:294) ~[netty-transport-4.1.58.Final.jar:4.1.58.Final]
    at io.lettuce.core.protocol.DefaultEndpoint.channelWriteAndFlush(DefaultEndpoint.java:392) ~[lettuce-core-5.3.6.RELEASE.jar:5.3.6.RELEASE]
    at io.lettuce.core.protocol.DefaultEndpoint.writeToChannelAndFlush(DefaultEndpoint.java:332) ~[lettuce-core-5.3.6.RELEASE.jar:5.3.6.RELEASE]
    at io.lettuce.core.protocol.DefaultEndpoint.write(DefaultEndpoint.java:162) ~[lettuce-core-5.3.6.RELEASE.jar:5.3.6.RELEASE]
    at io.lettuce.core.protocol.DefaultEndpoint$RetryListener.requeueCommands(DefaultEndpoint.java:1002) ~[lettuce-core-5.3.6.RELEASE.jar:5.3.6.RELEASE]
    at io.lettuce.core.protocol.DefaultEndpoint$RetryListener.lambda$potentiallyRequeueCommands$0(DefaultEndpoint.java:989) ~[lettuce-core-5.3.6.RELEASE.jar:5.3.6.RELEASE]
    at io.netty.util.concurrent.PromiseTask.runTask(PromiseTask.java:98) [netty-common-4.1.58.Final.jar:4.1.58.Final]
    at io.netty.util.concurrent.PromiseTask.run(PromiseTask.java:106) [netty-common-4.1.58.Final.jar:4.1.58.Final]
    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute$$$capture(AbstractEventExecutor.java:164) [netty-common-4.1.58.Final.jar:4.1.58.Final]
    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java) [netty-common-4.1.58.Final.jar:4.1.58.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472) [netty-common-4.1.58.Final.jar:4.1.58.Final]
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:497) [netty-transport-4.1.58.Final.jar:4.1.58.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989) [netty-common-4.1.58.Final.jar:4.1.58.Final]
    at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [netty-common-4.1.58.Final.jar:4.1.58.Final]
    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) [netty-common-4.1.58.Final.jar:4.1.58.Final]

Answer 1

Use 

       <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-sleuth</artifactId>
            <version>3.0.2</version>
        </dependency>

and 

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.4.3</version>
        <relativePath/>
    </parent>

which share same reactor versions like below 


<dependency>
             <groupId>io.projectreactor.netty</groupId>
             <artifactId>reactor-netty</artifactId>
             <version>1.0.4</version>
        </dependency>
        
        <dependency>
            <groupId>io.projectreactor</groupId>
            <artifactId>reactor-core</artifactId>
            <version>3.4.3</version>
        </dependency>