我正在尝试创建一个简单的 Spring 引导会话项目。这是Spring Initializr的基本设置。我收到以下错误：
2018-06-20 12:59:24.318 INFO 8108 --- [ main] c.j.s.SpringSessionExampleApplication : Starting SpringSessionExampleApplication on pankaj with PID 8108 (/Users/pankaj/Documents/workspace-sts-3.9.4.RELEASE/Spring-Session-Example/target/classes started by pankaj in /Users/pankaj/Documents/workspace-sts-3.9.4.RELEASE/Spring-Session-Example)
2018-06-20 12:59:24.329 INFO 8108 --- [ main] c.j.s.SpringSessionExampleApplication : No active profile set, falling back to default profiles: default
2018-06-20 12:59:24.372 INFO 8108 --- [ main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@39de3d36: startup date [Wed Jun 20 12:59:24 IST 2018]; root of context hierarchy
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils$1 (file:/Users/pankaj/.m2/repository/org/springframework/spring-core/5.0.7.RELEASE/spring-core-5.0.7.RELEASE.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
WARNING: Please consider reporting this to the maintainers of org.springframework.cglib.core.ReflectUtils$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
2018-06-20 12:59:25.208 INFO 8108 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2018-06-20 12:59:25.226 INFO 8108 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2018-06-20 12:59:25.226 INFO 8108 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.31
2018-06-20 12:59:25.230 INFO 8108 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [/Users/pankaj/Library/Java/Extensions:/Library/Java/Extensions:/Network/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java:.]
2018-06-20 12:59:25.297 INFO 8108 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2018-06-20 12:59:25.297 INFO 8108 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 931 ms
2018-06-20 12:59:25.407 INFO 8108 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Servlet dispatcherServlet mapped to [/]
2018-06-20 12:59:25.411 INFO 8108 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-06-20 12:59:25.411 INFO 8108 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-06-20 12:59:25.411 INFO 8108 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2018-06-20 12:59:25.411 INFO 8108 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2018-06-20 12:59:25.500 INFO 8108 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-06-20 12:59:25.687 INFO 8108 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@39de3d36: startup date [Wed Jun 20 12:59:24 IST 2018]; root of context hierarchy
2018-06-20 12:59:25.731 INFO 8108 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/messages],methods=[POST]}" onto public java.lang.String com.journaldev.spring.HomeController.saveMessage(java.lang.String,javax.servlet.http.HttpServletRequest)
2018-06-20 12:59:25.732 INFO 8108 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/],methods=[GET]}" onto public java.lang.String com.journaldev.spring.HomeController.home(org.springframework.ui.Model,javax.servlet.http.HttpSession)
2018-06-20 12:59:25.734 INFO 8108 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2018-06-20 12:59:25.735 INFO 8108 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2018-06-20 12:59:25.757 INFO 8108 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-06-20 12:59:25.758 INFO 8108 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-06-20 12:59:25.844 INFO 8108 --- [ main] o.s.b.a.w.s.WelcomePageHandlerMapping : Adding welcome page template: index
2018-06-20 12:59:26.005 WARN 8108 --- [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.boot.autoconfigure.session.SessionAutoConfiguration$ServletSessionRepositoryValidator': Invocation of init method failed; nested exception is org.springframework.boot.autoconfigure.session.SessionRepositoryUnavailableException: No session repository could be auto-configured, check your configuration (session store type is 'jdbc')
2018-06-20 12:59:26.006 INFO 8108 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Unregistering JMX-exposed beans on shutdown
2018-06-20 12:59:26.008 INFO 8108 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2018-06-20 12:59:26.023 INFO 8108 --- [ main] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2018-06-20 12:59:26.032 ERROR 8108 --- [ main] o.s.boot.SpringApplication : Application run failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.boot.autoconfigure.session.SessionAutoConfiguration$ServletSessionRepositoryValidator': Invocation of init method failed; nested exception is org.springframework.boot.autoconfigure.session.SessionRepositoryUnavailableException: No session repository could be auto-configured, check your configuration (session store type is 'jdbc')
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:138) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:424) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1700) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:581) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:503) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:760) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:869) ~[spring-context-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) ~[spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:395) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:327) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1255) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1243) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
at com.journaldev.spring.SpringSessionExampleApplication.main(SpringSessionExampleApplication.java:10) [classes/:na]
Caused by: org.springframework.boot.autoconfigure.session.SessionRepositoryUnavailableException: No session repository could be auto-configured, check your configuration (session store type is 'jdbc')
at org.springframework.boot.autoconfigure.session.SessionAutoConfiguration$AbstractSessionRepositoryValidator.checkSessionRepository(SessionAutoConfiguration.java:257) ~[spring-boot-autoconfigure-2.0.3.RELEASE.jar:2.0.3.RELEASE]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:564) ~[na:na]
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:365) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:308) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:135) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
... 18 common frames omitted
我的application.properties：
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/SpringSessionDB
spring.datasource.username=pankaj
spring.datasource.password=pankaj
spring.session.store-type=jdbc
spring.session.jdbc.initialize-schema=always
依赖：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.session</groupId>
<artifactId>spring-session-core</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
我不确定这里缺少什么？
您缺少spring-session-jdbc依赖项，因此类路径中不存在JdbcOperationsSessionRepository。您的依赖管理仅提供spring-session-core依赖关系，仅提供Spring Session核心API - 具体的SessionRepository实现放置在专用模块中，即spring-session-data-redis、spring-session-jdbc、spring-session-hazelcast等。
执行此操作后，还可以删除spring.session.store-type配置属性。只要您在类路径上有一个SessionRepository实现，Spring Boot 就能够推断出要自动配置哪一个，而无需您提供spring.session.store-type。
话虽如此，Initializr 应该能够为您包含spring-session-jdbc，但我相信您最初在 Initialzr 上创建项目时只选择了Web、Session和MySQL选项。与Session选项一起，您还应该选择您打算使用的商店(在本例中为JDBC(，以便 Initializr 可以包含所需的 Spring 会话模块。
最后，Spring Session 模块的安排在 Spring Session 2.0 中发生了变化，因为以前所有的代码和SessionRepository实现都放在 Spring Session 2.0 中不再存在的工件spring-session工件中。您可以在参考手册中了解更多信息，并在2.0.0.RELEASE公告中提及。