springframework.data.redis.RedisConnectionFailureException: Cannot get Jedis connection

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本文介绍了一个关于 Spring Session 集成 Redis 时出现连接失败的问题，并提供了详细的错误日志及两种解决方案：一是开启本地 Redis 服务并进行相应配置；二是确保远程 Redis 服务正常运行。

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报错如下：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'enableRedisKeyspaceNotificationsInitializer' defined in class path resource [org/springframework/session/data/redis/config/annotation/web/http/RedisHttpSessionConfiguration.class]: Invocation of init method failed; nested exception is org.springframework.data.redis.RedisConnectionFailureException: Cannot get Jedis connection; nested exception is redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1628) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867) ~[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) ~[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) ~[spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) ~[spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) ~[spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:134) [spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at com.ztesoft.SyGatewayApplication.main(SyGatewayApplication.java:17) [classes/:na]
Caused by: org.springframework.data.redis.RedisConnectionFailureException: Cannot get Jedis connection; nested exception is redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool
at org.springframework.data.redis.connection.jedis.JedisConnectionFactory.fetchJedisConnector(JedisConnectionFactory.java:204) ~[spring-data-redis-1.8.6.RELEASE.jar:na]
at org.springframework.data.redis.connection.jedis.JedisConnectionFactory.getConnection(JedisConnectionFactory.java:348) ~[spring-data-redis-1.8.6.RELEASE.jar:na]
at org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration$EnableRedisKeyspaceNotificationsInitializer.afterPropertiesSet(RedisHttpSessionConfiguration.java:249) ~[spring-session-1.3.1.RELEASE.jar:na]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1687) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1624) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
... 15 common frames omitted
Caused by: redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool
at redis.clients.util.Pool.getResource(Pool.java:53) ~[jedis-2.9.0.jar:na]
at redis.clients.jedis.JedisPool.getResource(JedisPool.java:226) ~[jedis-2.9.0.jar:na]
at redis.clients.jedis.JedisPool.getResource(JedisPool.java:16) ~[jedis-2.9.0.jar:na]
at org.springframework.data.redis.connection.jedis.JedisConnectionFactory.fetchJedisConnector(JedisConnectionFactory.java:194) ~[spring-data-redis-1.8.6.RELEASE.jar:na]
... 19 common frames omitted
Caused by: redis.clients.jedis.exceptions.JedisConnectionException: java.net.ConnectException: Connection refused: connect
at redis.clients.jedis.Connection.connect(Connection.java:207) ~[jedis-2.9.0.jar:na]
at redis.clients.jedis.BinaryClient.connect(BinaryClient.java:93) ~[jedis-2.9.0.jar:na]
at redis.clients.jedis.BinaryJedis.connect(BinaryJedis.java:1767) ~[jedis-2.9.0.jar:na]
at redis.clients.jedis.JedisFactory.makeObject(JedisFactory.java:106) ~[jedis-2.9.0.jar:na]
at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:868) ~[commons-pool2-2.4.2.jar:2.4.2]
at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:435) ~[commons-pool2-2.4.2.jar:2.4.2]
at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:363) ~[commons-pool2-2.4.2.jar:2.4.2]
at redis.clients.util.Pool.getResource(Pool.java:49) ~[jedis-2.9.0.jar:na]
... 22 common frames omitted
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method) ~[na:1.8.0_131]
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85) ~[na:1.8.0_131]
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) ~[na:1.8.0_131]
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[na:1.8.0_131]
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) ~[na:1.8.0_131]
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) ~[na:1.8.0_131]
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.8.0_131]
at java.net.Socket.connect(Socket.java:589) ~[na:1.8.0_131]
at redis.clients.jedis.Connection.connect(Connection.java:184) ~[jedis-2.9.0.jar:na]
... 29 common frames omitted

Disconnected from the target VM, address: '127.0.0.1:50612', transport: 'socket'

问题原因：远程redis未开启，从而导致程序运行终止。

解决办法：（1）若转为本地redis，则首先在本地安装redis，将redis.conf（windows版本为redis.windows.conf）配置文件中的绑定地址（bind）改为bind 127.0.0.1，将本地的保护模式关掉（即redis.conf中设置为protected-mode no），数据源设置为与项目对应的databases 0。关闭redis后，重启！

（2）再在IDEA或eclipse中，将项目的配偶文件application.properties中与redis有关的修改为spring.redis.host=127.0.0.1（注意：项目中注册中心、网关、后台、前台各有一个application.properties配置文件，只要有spring.redis.host语句的都要改成上述地址）。