我们有许多使用spring-boot-starter-redis依赖的Spring Boot（v1.2.3）和Spring Data Redis的服务。
我们也使用spring会话及其相应的redis依赖
<dependency>
<groupId>org.springframework.session</groupId>
<artifactId>spring-session</artifactId>
<version>1.0.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.session</groupId>
<artifactId>spring-session-data-redis</artifactId>
<version>1.0.0.RELEASE</version>
<type>pom</type>
</dependency>
如果redis服务器未启动或无法访问，则服务会发出故障并中止启动。
是否可以允许服务在启动时不会失败？我需要设置什么才能这样做？
注意：我跟踪了关键故障，并且是Redis对Spring Session的支持。这里发生的故障会导致服务失败。如果与redis的连接失败，是否可以回退到常规会话？
RedisHttpSessionConfiguration.java at line 156
public void afterPropertiesSet() throws Exception {
>>> RedisConnection connection = connectionFactory.getConnection();
2015-06-02 17:20:00.214 WARN 67248 --- [ main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt
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:1566) ~[spring-beans-4.1.5.RELEASE.jar:4.1.5.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539) ~[spring-beans-4.1.5.RELEASE.jar:4.1.5.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476) ~[spring-beans-4.1.5.RELEASE.jar:4.1.5.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303) ~[spring-beans-4.1.5.RELEASE.jar:4.1.5.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.1.5.RELEASE.jar:4.1.5.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299) ~[spring-beans-4.1.5.RELEASE.jar:4.1.5.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) ~[spring-beans-4.1.5.RELEASE.jar:4.1.5.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:755) ~[spring-beans-4.1.5.RELEASE.jar:4.1.5.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757) ~[spring-context-4.1.5.RELEASE.jar:4.1.5.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480) ~[spring-context-4.1.5.RELEASE.jar:4.1.5.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118) [spring-boot-1.2.2.RELEASE.jar:1.2.2.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:686) [spring-boot-1.2.2.RELEASE.jar:1.2.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:320) [spring-boot-1.2.2.RELEASE.jar:1.2.2.RELEASE]
at com.cisco.services.rpil.MicroServiceApplication.main(MicroServiceApplication.java:47) [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:140) ~[spring-data-redis-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.data.redis.connection.jedis.JedisConnectionFactory.getConnection(JedisConnectionFactory.java:229) ~[spring-data-redis-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.data.redis.connection.jedis.JedisConnectionFactory.getConnection(JedisConnectionFactory.java:57) ~[spring-data-redis-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration$EnableRedisKeyspaceNotificationsInitializer.afterPropertiesSet(RedisHttpSessionConfiguration.java:156) ~[spring-session-1.0.0.RELEASE.jar:na]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1625) ~[spring-beans-4.1.5.RELEASE.jar:4.1.5.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1562) ~[spring-beans-4.1.5.RELEASE.jar:4.1.5.RELEASE]
... 13 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:42) ~[jedis-2.5.2.jar:na]
at redis.clients.jedis.JedisPool.getResource(JedisPool.java:84) ~[jedis-2.5.2.jar:na]
at redis.clients.jedis.JedisPool.getResource(JedisPool.java:10) ~[jedis-2.5.2.jar:na]
at org.springframework.data.redis.connection.jedis.JedisConnectionFactory.fetchJedisConnector(JedisConnectionFactory.java:133) ~[spring-data-redis-1.4.2.RELEASE.jar:1.4.2.RELEASE]
... 18 common frames omitted
Caused by: redis.clients.jedis.exceptions.JedisConnectionException: java.net.ConnectException: Connection refused
at redis.clients.jedis.Connection.connect(Connection.java:150) ~[jedis-2.5.2.jar:na]
at redis.clients.jedis.BinaryClient.connect(BinaryClient.java:71) ~[jedis-2.5.2.jar:na]
at redis.clients.jedis.BinaryJedis.connect(BinaryJedis.java:1783) ~[jedis-2.5.2.jar:na]
at redis.clients.jedis.JedisFactory.makeObject(JedisFactory.java:65) ~[jedis-2.5.2.jar:na]
at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:836) ~[commons-pool2-2.2.jar:2.2]
at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:434) ~[commons-pool2-2.2.jar:2.2]
at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:361) ~[commons-pool2-2.2.jar:2.2]
at redis.clients.util.Pool.getResource(Pool.java:40) ~[jedis-2.5.2.jar:na]
... 21 common frames omitted
Caused by: java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method) ~[na:1.8.0_25]
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345) ~[na:1.8.0_25]
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[na:1.8.0_25]
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) ~[na:1.8.0_25]
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.8.0_25]
at java.net.Socket.connect(Socket.java:589) ~[na:1.8.0_25]
at redis.clients.jedis.Connection.connect(Connection.java:144) ~[jedis-2.5.2.jar:na]
... 28 common frames omitted