Error creating bean with name 'enableRedisKeyspaceNotificationsInitializer' defined in class path resource

      我们在SpringBoot中用Jedis来访问Redis，其中Redis是采用集群（单机没有本篇文章的问题）的方式，在启用Redis的时候碰到如上问题。

错误的核心信息如下：

      Error creating bean with name 'enableRedisKeyspaceNotificationsInitializer' defined in class path resource

      完整信息如下：

2017/11/11 下午4:41:39  .   ____          _            __ _ _
2017/11/11 下午4:41:39 /\ / ___'_ __ _ _(_)_ __  __ _    
2017/11/11 下午4:41:39( ( )\___ | '_ | '_| | '_ / _` |    
2017/11/11 下午4:41:39 \/  ___)| |_)| | | | | || (_| |  ) ) ) )
2017/11/11 下午4:41:39  '  |____| .__|_| |_|_| |_\__, | / / / /
2017/11/11 下午4:41:39 =========|_|==============|___/=/_/_/_/
2017/11/11 下午4:41:39 :: Spring Boot ::        (v1.5.1.RELEASE)
2017/11/11 下午4:41:39
2017/11/11 下午4:41:40Nov 11, 2017 4:41:40 PM com.navercorp.pinpoint.bootstrap.config.DefaultProfilerConfig readBoolean
2017/11/11 下午4:41:40INFO: profiler.jdk.http.param=true
2017/11/11 下午4:41:40Nov 11, 2017 4:41:40 PM com.navercorp.pinpoint.bootstrap.config.DefaultProfilerConfig readBoolean
2017/11/11 下午4:41:40INFO: profiler.jdk.http.param=true
2017/11/11 下午4:41:40Nov 11, 2017 4:41:40 PM com.navercorp.pinpoint.bootstrap.config.DefaultProfilerConfig readBoolean
2017/11/11 下午4:41:40INFO: profiler.jdk.http.param=true
2017/11/11 下午4:41:52org.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
2017/11/11 下午4:41:52    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1628)
2017/11/11 下午4:41:52    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)
2017/11/11 下午4:41:52    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
2017/11/11 下午4:41:52    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
2017/11/11 下午4:41:52    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
2017/11/11 下午4:41:52    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
2017/11/11 下午4:41:52    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
2017/11/11 下午4:41:52    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761)
2017/11/11 下午4:41:52    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866)
2017/11/11 下午4:41:52    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542)
2017/11/11 下午4:41:52    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122)
2017/11/11 下午4:41:52    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:737)
2017/11/11 下午4:41:52    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:370)
2017/11/11 下午4:41:52    at org.springframework.boot.SpringApplication.run(SpringApplication.java:314)
2017/11/11 下午4:41:52    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162)
2017/11/11 下午4:41:52    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151)
2017/11/11 下午4:41:52    at com.zte.Application.main(Application.java:27)
2017/11/11 下午4:41:52    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2017/11/11 下午4:41:52    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
2017/11/11 下午4:41:52    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
2017/11/11 下午4:41:52    at java.lang.reflect.Method.invoke(Method.java:498)
2017/11/11 下午4:41:52    at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48)
2017/11/11 下午4:41:52    at org.springframework.boot.loader.Launcher.launch(Launcher.java:87)
2017/11/11 下午4:41:52    at org.springframework.boot.loader.Launcher.launch(Launcher.java:50)
2017/11/11 下午4:41:52    at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:51)
2017/11/11 下午4:41:52Caused 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
2017/11/11 下午4:41:52    at org.springframework.data.redis.connection.jedis.JedisConnectionFactory.fetchJedisConnector(JedisConnectionFactory.java:204)
2017/11/11 下午4:41:52    at org.springframework.data.redis.connection.jedis.JedisConnectionFactory.getConnection(JedisConnectionFactory.java:348)
2017/11/11 下午4:41:52    at org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration$EnableRedisKeyspaceNotifica

      经查找，在Java代码中，我们使用了注解：@EnableRedisHttpSession，这个注解是用来开启Redis来集式式管理Session。

      而在使用这种方式的时候，是需要Redis开启Keyspace Notifications功能的，默认是关闭的。

      这个功能有一个参数来控制它，notify-keyspace-events，值为Egx。

      可以通过在Redis.Config中配置。

      也可以通过命令行来配置，如下所示：

     redis-cli config set notify-keyspace-events Egx

      然后重启Redis生效。

参考文档：

      https://docs.spring.io/spring-session/docs/current/reference/html5/#api-redisoperationssessionrepository-sessiondestroyedevent

      http://blog.csdn.net/xiaoyu411502/article/details/51248980