Spring Boot之No session repository could be auto-configured, check your configuration问题解决

1.  环境介绍
     JDK 1.8  Spring-Boot 1.5.1.RELEASE, STS IDE

2.  问题的提出
     创建了一个非常简约的Spring Boot Web Application，其中使用了Spring-Session，具体的maven依赖如下：
<dependency>
<groupId>org.springframework.session</groupId>
<artifactId>spring-session</artifactId>
</dependency>    在启动过程中，出现了如下错误信息：

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2017-02-23 17:48:10.710 ERROR 29484 --- [  restartedMain] o.s.boot.SpringApplication               : Application startup failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.boot.autoconfigure.session.SessionAutoConfiguration$SessionRepositoryValidator': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: No session repository could be auto-configured, check your configuration (session store type is 'null')
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:137)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:409)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1620)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:737)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:370)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:314)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151)
at org.rosebird.data.stock.StockdataApplication.main(StockdataApplication.java:10)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)
Caused by: java.lang.IllegalArgumentException: No session repository could be auto-configured, check your configuration (session store type is 'null')
at org.springframework.util.Assert.notNull(Assert.java:115)
at org.springframework.boot.autoconfigure.session.SessionAutoConfiguration$SessionRepositoryValidator.checkSessionRepository(SessionAutoConfiguration.java:100)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:366)
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:311)
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:134)
... 23 common frames omitted

     异常栈很长，关键的错误信息是：No session repository could be auto-configured, check your configuration (session store type is 'null')，这个信息对于我们进行问题分析提供了非常大的指引， 我们将重点放在session store type的功能分析上。

3.  问题的解决与分析
     在网上搜索之后，我们发现session store type使用来存放session的存储方式，目前Spring boot中只支持redis方式。 由于本应用暂无需将session放入redis的需求，故这里就可以将session store type设置为none.
    这里我们将此配置信息放入application.properites之中：
# default-store in spring session. it will be set in redis only outside.
spring.session.store-type=none  重新启动应用，错误信息消失， 我们可以看到了启动正常的信息了：

2017-02-23 19:36:17.437  INFO 10500 --- [  restartedMain] o.s.s.web.DefaultSecurityFilterChain     : Creating filter chain: OrRequestMatcher [requestMatchers=[Ant [pattern='/css/**'], Ant [pattern='/js/**'], Ant [pattern='/images/**'], Ant [pattern='/webjars/**'], Ant [pattern='/**/favicon.ico'], Ant [pattern='/error']]], []
2017-02-23 19:36:17.823  INFO 10500 --- [  restartedMain] o.s.s.web.DefaultSecurityFilterChain     : Creating filter chain: OrRequestMatcher [requestMatchers=[Ant [pattern='/**']]], [org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter@6c7bc3c3, org.springframework.security.web.context.SecurityContextPersistenceFilter@7e251380, org.springframework.security.web.header.HeaderWriterFilter@d2c9b20, org.springframework.security.web.authentication.logout.LogoutFilter@32d5aa81, org.springframework.security.web.authentication.www.BasicAuthenticationFilter@57b802cf, org.springframework.security.web.savedrequest.RequestCacheAwareFilter@6a11f15, org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter@510cb143, org.springframework.security.web.authentication.AnonymousAuthenticationFilter@69e3d43f, org.springframework.security.web.session.SessionManagementFilter@182c322e, org.springframework.security.web.access.ExceptionTranslationFilter@72545397, org.springframework.security.web.access.intercept.FilterSecurityInterceptor@7c8a6e92]
2017-02-23 19:36:18.163  INFO 10500 --- [  restartedMain] o.s.b.d.a.OptionalLiveReloadServer       : LiveReload server is running on port 35729
2017-02-23 19:36:18.346  INFO 10500 --- [  restartedMain] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2017-02-23 19:36:18.570  INFO 10500 --- [  restartedMain] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2017-02-23 19:36:18.588  INFO 10500 --- [  restartedMain] o.r.data.stock.StockdataApplication      : Started StockdataApplication in 25.393 seconds (JVM running for 27.444)

4.  总结
  无。
参考资料：
 1. http://stackoverflow.com/questions/38194650/no-session-repository-could-be-auto-configured-check-your-configuration-sessio