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Spring boot connot connect to Redis

本地服务无法连接外部的redis服务

报错日志输出

Caused by: org.springframework.data.redis.RedisConnectionFailureException: Unable to connect to Redis
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$ExceptionTranslatingConnectionProvider.translateException(LettuceConnectionFactor
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$ExceptionTranslatingConnectionProvider.getConnection(LettuceConnectionFactory.jav
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$SharedConnection.getNativeConnection(LettuceConnectionFactory.java:1586)
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$SharedConnection.lambda$getConnection$0(LettuceConnectionFactory.java:1566)
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory.doInLock(LettuceConnectionFactory.java:1527)
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$SharedConnection.getConnection(LettuceConnectionFactory.java:1563)
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory.getSharedConnection(LettuceConnectionFactory.java:1249)
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory.getConnection(LettuceConnectionFactory.java:1055)
	at org.springframework.data.redis.core.RedisConnectionUtils.fetchConnection(RedisConnectionUtils.java:195)
	at org.springframework.data.redis.core.RedisConnectionUtils.doGetConnection(RedisConnectionUtils.java:144)
	at org.springframework.data.redis.core.RedisConnectionUtils.getConnection(RedisConnectionUtils.java:105)
	at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:398)
	at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:378)
	at org.springframework.data.redis.core.AbstractOperations.execute(AbstractOperations.java:117)
	at org.springframework.data.redis.core.DefaultValueOperations.set(DefaultValueOperations.java:199)
	at com.slw.common.core.redis.RedisCache.setCacheObject(RedisCache.java:36)
	at com.slw.system.service.impl.SysConfigServiceImpl.loadingConfigCache(SysConfigServiceImpl.java:181)
	at com.slw.system.service.impl.SysConfigServiceImpl.init(SysConfigServiceImpl.java:41)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMethod.invoke(InitDestroyAnnotationBeanPostProcessor.java:457)
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcess
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.j
	... 42 common frames omitted
Caused by: org.springframework.data.redis.connection.PoolException: Could not get a resource from the pool
	at org.springframework.data.redis.connection.lettuce.LettucePoolingConnectionProvider.getConnection(LettucePoolingConnectionProvider.java:114)
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$ExceptionTranslatingConnectionProvider.getConnection(LettuceConnectionFactory.jav
	... 65 common frames omitted
Caused by: io.lettuce.core.RedisConnectionException: Unable to connect to localhost/<unresolved>:6379
	at io.lettuce.core.RedisConnectionException.create(RedisConnectionException.java:63)
	at io.lettuce.core.RedisConnectionException.create(RedisConnectionException.java:41)
	at io.lettuce.core.AbstractRedisClient.getConnection(AbstractRedisClient.java:354)
	at io.lettuce.core.RedisClient.connect(RedisClient.java:219)
	at org.springframework.data.redis.connection.lettuce.StandaloneConnectionProvider.lambda$getConnection$1(StandaloneConnectionProvider.java:112)
	at java.base/java.util.Optional.orElseGet(Optional.java:364)
	at org.springframework.data.redis.connection.lettuce.StandaloneConnectionProvider.getConnection(StandaloneConnectionProvider.java:112)
	at org.springframework.data.redis.connection.lettuce.LettucePoolingConnectionProvider.lambda$getConnection$0(LettucePoolingConnectionProvider.java:96)
	at io.lettuce.core.support.ConnectionPoolSupport$RedisPooledObjectFactory.create(ConnectionPoolSupport.java:196)
	at io.lettuce.core.support.ConnectionPoolSupport$RedisPooledObjectFactory.create(ConnectionPoolSupport.java:186)
	at org.apache.commons.pool2.BasePooledObjectFactory.makeObject(BasePooledObjectFactory.java:68)
	at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:557)
	at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:299)
	at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:231)
	at io.lettuce.core.support.ConnectionPoolSupport$1.borrowObject(ConnectionPoolSupport.java:107)
	at io.lettuce.core.support.ConnectionPoolSupport$1.borrowObject(ConnectionPoolSupport.java:102)
	at org.springframework.data.redis.connection.lettuce.LettucePoolingConnectionProvider.getConnection(LettucePoolingConnectionProvider.java:109)
	... 66 common frames omitted
Caused by: io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: localhost/127.0.0.1:6379
Caused by: java.net.ConnectException: Connection refused
	at java.base/sun.nio.ch.Net.pollConnect(Native Method)
	at java.base/sun.nio.ch.Net.pollConnectNow(Net.java:672)
	at java.base/sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:946)
	at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:336)
	at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:339)
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:784)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:732)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:658)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562)
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:998)
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.base/java.lang.Thread.run(Thread.java:833)

pom文件

        <!-- redis 缓存操作 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>

application.yaml文件

spring:
  redis:
    # 地址
    host: 127.0.0.1
    # 端口，默认为6379
    port: 6379
    # 数据库索引
    database: 0
    # 密码
    password:
    # 连接超时时间
    timeout: 10s
    lettuce:
      pool:
        # 连接池中的最小空闲连接
        min-idle: 0
        # 连接池中的最大空闲连接
        max-idle: 8
        # 连接池的最大数据库连接数
        max-active: 8
        # #连接池最大阻塞等待时间（使用负值表示没有限制）
        max-wait: -1ms

错误原因分析：

和springboot3更改属性名称有关(https://docs.spring.io/spring-boot/docs/current/reference/html/application-properties.html#appendix.application-properties.data).

springboot版本从2升级到3，redis依赖关系由

<dependency>
    <groupId>org.springframework.data</groupId>
    <artifactId>spring-data-redis</artifactId>
    <version>2.3.3.RELEASE</version>
 </dependency>

变为

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
    <version>3.0.1</version>
</dependency>

所以将配置spring.redis.host变成spring.data.redis.host

修改yaml配置文件

spring:
  data:
    redis:
      # 地址
      host: 127.0.0.1
      # 端口，默认为6379
      port: 6379
      # 数据库索引
      database: 0
      # 密码
      password:
      # 连接超时时间
      timeout: 10s
      lettuce:
        pool:
          # 连接池中的最小空闲连接
          min-idle: 0
          # 连接池中的最大空闲连接
          max-idle: 8
          # 连接池的最大数据库连接数
          max-active: 8
          # #连接池最大阻塞等待时间（使用负值表示没有限制）
          max-wait: -1ms

参考原文链接：

https://github.com/spring-projects/spring-boot/issues/35612

https://stackoverflow.com/questions/75006135/caused-by-io-netty-channel-abstractchannelannotatedconnectexception-connectio

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