RedisConnectionFailureException: Cannot get Jedis connection

异常信息

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-1.8.18.RELEASE.jar:na]
	at org.springframework.data.redis.connection.jedis.JedisConnectionFactory.getConnection(JedisConnectionFactory.java:348) ~[spring-data-redis-1.8.18.RELEASE.jar:na]
	at org.springframework.data.redis.core.RedisConnectionUtils.doGetConnection(RedisConnectionUtils.java:129) ~[spring-data-redis-1.8.18.RELEASE.jar:na]
	at org.springframework.data.redis.core.RedisConnectionUtils.getConnection(RedisConnectionUtils.java:92) ~[spring-data-redis-1.8.18.RELEASE.jar:na]
	at org.springframework.data.redis.core.RedisConnectionUtils.getConnection(RedisConnectionUtils.java:79) ~[spring-data-redis-1.8.18.RELEASE.jar:na]
	at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:194) ~[spring-data-redis-1.8.18.RELEASE.jar:na]
	at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:169) ~[spring-data-redis-1.8.18.RELEASE.jar:na]
	at org.springframework.data.redis.core.AbstractOperations.execute(AbstractOperations.java:91) ~[spring-data-redis-1.8.18.RELEASE.jar:na]
	at org.springframework.data.redis.core.DefaultSetOperations.members(DefaultSetOperations.java:126) ~[spring-data-redis-1.8.18.RELEASE.jar:na]
	at org.springframework.data.redis.core.DefaultBoundSetOperations.members(DefaultBoundSetOperations.java:91) ~[spring-data-redis-1.8.18.RELEASE.jar:na]
	at org.springframework.session.data.redis.RedisSessionExpirationPolicy.cleanExpiredSessions(RedisSessionExpirationPolicy.java:131) ~[spring-session-1.3.5.RELEASE.jar:na]
	at org.springframework.session.data.redis.RedisOperationsSessionRepository.cleanupExpiredSessions(RedisOperationsSessionRepository.java:398) ~[spring-session-1.3.5.RELEASE.jar:na]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_144]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_144]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_144]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_144]
	at org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:65) ~[spring-context-4.3.22.RELEASE.jar:4.3.22.RELEASE]
	at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54) ~[spring-context-4.3.22.RELEASE.jar:4.3.22.RELEASE]
	at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:81) [spring-context-4.3.22.RELEASE.jar:4.3.22.RELEASE]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_144]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_144]
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_144]
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1.8.0_144]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_144]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_144]
	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_144]
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-2.9.1.jar:na]
	at redis.clients.jedis.JedisPool.getResource(JedisPool.java:226) ~[jedis-2.9.1.jar:na]
	at redis.clients.jedis.JedisPool.getResource(JedisPool.java:16) ~[jedis-2.9.1.jar:na]
	at org.springframework.data.redis.connection.jedis.JedisConnectionFactory.fetchJedisConnector(JedisConnectionFactory.java:194) ~[spring-data-redis-1.8.18.RELEASE.jar:na]
	... 25 common frames omitted
Caused by: redis.clients.jedis.exceptions.JedisConnectionException: Failed connecting to host localhost:6379
	at redis.clients.jedis.Connection.connect(Connection.java:207) ~[jedis-2.9.1.jar:na]
	at redis.clients.jedis.BinaryClient.connect(BinaryClient.java:101) ~[jedis-2.9.1.jar:na]
	at redis.clients.jedis.BinaryJedis.connect(BinaryJedis.java:1844) ~[jedis-2.9.1.jar:na]
	at redis.clients.jedis.JedisFactory.makeObject(JedisFactory.java:106) ~[jedis-2.9.1.jar:na]
	at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:888) ~[commons-pool2-2.4.3.jar:2.4.3]
	at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:432) ~[commons-pool2-2.4.3.jar:2.4.3]
	at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:361) ~[commons-pool2-2.4.3.jar:2.4.3]
	at redis.clients.util.Pool.getResource(Pool.java:49) ~[jedis-2.9.1.jar:na]
	... 28 common frames omitted
Caused by: java.net.ConnectException: Connection refused: connect
	at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method) ~[na:1.8.0_144]
	at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85) ~[na:1.8.0_144]
	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) ~[na:1.8.0_144]
	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[na:1.8.0_144]
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) ~[na:1.8.0_144]
	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) ~[na:1.8.0_144]
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.8.0_144]
	at java.net.Socket.connect(Socket.java:589) ~[na:1.8.0_144]
	at redis.clients.jedis.Connection.connect(Connection.java:184) ~[jedis-2.9.1.jar:na]
	... 35 common frames omitted

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场景描述

springboot项目用redis解决session共享问题，启动项目报错。
springboot版本：

org.springframework.boot
spring-boot-starter-parent
1.5.19.RELEASE

redis版本

[15332] 12 Mar 15:59:54.307 # Server started, Redis version 2.6.12
[15332] 12 Mar 15:59:54.308 * The server is now ready to accept connections on port 6379

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异常原因

redis服务器版本和jar包版本不一致造成的
maven仓库的 spring-boot-starter-redis1.3.8的只支持2.7.3 的redis

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解决方案

更换redis服务器版本为springboot兼容的版本。这里更换为3.0。
[25072] 12 Mar 16:01:52.065 # Server started, Redis version 3.0.501
[25072] 12 Mar 16:01:52.065 * The server is now ready to accept connections on port 6379