17. Classes

A class is a data structure that may contain data members (constants and
fields), function members (methods,
properties, events, indexers, operators, instance constructors,
destructors, and static constructors), and nested
types. Class types support inheritance, a mechanism whereby a derived class
can extend and specialize a base
class.
内容概要:本文详细介绍了“秒杀商城”微服务架构的设计与实战全过程,涵盖系统从需求分析、服务拆分、技术选型到核心功能开发、分布式事务处理、容器化部署及监控链路追踪的完整流程。重点解决了高并发场景下的超卖问题,采用Redis预减库存、消息队列削峰、数据库乐观锁等手段保障数据一致性,并通过Nacos实现服务注册发现与配置管理,利用Seata处理跨服务分布式事务,结合RabbitMQ实现异步下单,提升系统吞吐能力。同时,项目支持Docker Compose快速部署和Kubernetes生产级编排,集成Sleuth+Zipkin链路追踪与Prometheus+Grafana监控体系,构建可观测性强的微服务系统。; 适合人群:具备Java基础和Spring Boot开发经验,熟悉微服务基本概念的中高级研发人员,尤其是希望深入理解高并发系统设计、分布式事务、服务治理等核心技术的开发者;适合工作2-5年、有志于转型微服务或提升架构能力的工程师; 使用场景及目标:①学习如何基于Spring Cloud Alibaba构建完整的微服务项目;②掌握秒杀场景下高并发、超卖控制、异步化、削峰填谷等关键技术方案;③实践分布式事务(Seata)、服务熔断降级、链路追踪、统一配置中心等企业级中间件的应用;④完成从本地开发到容器化部署的全流程落地; 阅读建议:建议按照文档提供的七个阶段循序渐进地动手实践,重点关注秒杀流程设计、服务间通信机制、分布式事务实现和系统性能优化部分,结合代码调试与监控工具深入理解各组件协作原理,真正掌握高并发微服务系统的构建能力。
C:\Users\GJ\.jdks\openjdk-23.0.1\bin\java.exe -XX:TieredStopAtLevel=1 -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dspring.jmx.enabled=true -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true "-Dmanagement.endpoints.jmx.exposure.include=*" "-javaagent:D:\idea\IntelliJ IDEA 2023.2.2\lib\idea_rt.jar=57306:D:\idea\IntelliJ IDEA 2023.2.2\bin" -Dfile.encoding=UTF-8 -Dsun.stdout.encoding=UTF-8 -Dsun.stderr.encoding=UTF-8 -classpath E:\springboot_vue_wms\wms\target\classes;D:\apache-maven-3.9.9\org\springframework\boot\spring-boot-starter-web\3.3.9\spring-boot-starter-web-3.3.9.jar;D:\apache-maven-3.9.9\org\springframework\boot\spring-boot-starter\3.3.9\spring-boot-starter-3.3.9.jar;D:\apache-maven-3.9.9\org\springframework\boot\spring-boot\3.3.9\spring-boot-3.3.9.jar;D:\apache-maven-3.9.9\org\springframework\boot\spring-boot-starter-logging\3.3.9\spring-boot-starter-logging-3.3.9.jar;D:\apache-maven-3.9.9\ch\qos\logback\logback-classic\1.5.16\logback-classic-1.5.16.jar;D:\apache-maven-3.9.9\ch\qos\logback\logback-core\1.5.16\logback-core-1.5.16.jar;D:\apache-maven-3.9.9\org\apache\logging\log4j\log4j-to-slf4j\2.23.1\log4j-to-slf4j-2.23.1.jar;D:\apache-maven-3.9.9\org\apache\logging\log4j\log4j-api\2.23.1\log4j-api-2.23.1.jar;D:\apache-maven-3.9.9\org\slf4j\jul-to-slf4j\2.0.16\jul-to-slf4j-2.0.16.jar;D:\apache-maven-3.9.9\jakarta\annotation\jakarta.annotation-api\2.1.1\jakarta.annotation-api-2.1.1.jar;D:\apache-maven-3.9.9\org\yaml\snakeyaml\2.2\snakeyaml-2.2.jar;D:\apache-maven-3.9.9\org\springframework\boot\spring-boot-starter-json\3.3.9\spring-boot-starter-json-3.3.9.jar;D:\apache-maven-3.9.9\com\fasterxml\jackson\core\jackson-databind\2.17.3\jackson-databind-2.17.3.jar;D:\apache-maven-3.9.9\com\fasterxml\jackson\core\jackson-annotations\2.17.3\jackson-annotations-2.17.3.jar;D:\apache-maven-3.9.9\com\fasterxml\jackson\core\jackson-core\2.17.3\jackson-core-2.17.3.jar;D:\apache-maven-3.9.9\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.17.3\jackson-datatype-jdk8-2.17.3.jar;D:\apache-maven-3.9.9\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.17.3\jackson-datatype-jsr310-2.17.3.jar;D:\apache-maven-3.9.9\com\fasterxml\jackson\module\jackson-module-parameter-names\2.17.3\jackson-module-parameter-names-2.17.3.jar;D:\apache-maven-3.9.9\org\springframework\boot\spring-boot-starter-tomcat\3.3.9\spring-boot-starter-tomcat-3.3.9.jar;D:\apache-maven-3.9.9\org\apache\tomcat\embed\tomcat-embed-core\10.1.36\tomcat-embed-core-10.1.36.jar;D:\apache-maven-3.9.9\org\apache\tomcat\embed\tomcat-embed-el\10.1.36\tomcat-embed-el-10.1.36.jar;D:\apache-maven-3.9.9\org\apache\tomcat\embed\tomcat-embed-websocket\10.1.36\tomcat-embed-websocket-10.1.36.jar;D:\apache-maven-3.9.9\org\springframework\spring-web\6.1.17\spring-web-6.1.17.jar;D:\apache-maven-3.9.9\org\springframework\spring-beans\6.1.17\spring-beans-6.1.17.jar;D:\apache-maven-3.9.9\org\springframework\spring-webmvc\6.1.17\spring-webmvc-6.1.17.jar;D:\apache-maven-3.9.9\org\springframework\spring-aop\6.1.17\spring-aop-6.1.17.jar;D:\apache-maven-3.9.9\org\springframework\spring-context\6.1.17\spring-context-6.1.17.jar;D:\apache-maven-3.9.9\org\springframework\spring-expression\6.1.17\spring-expression-6.1.17.jar;D:\apache-maven-3.9.9\com\mysql\mysql-connector-j\8.3.0\mysql-connector-j-8.3.0.jar;D:\apache-maven-3.9.9\org\projectlombok\lombok\1.18.36\lombok-1.18.36.jar;D:\apache-maven-3.9.9\org\slf4j\slf4j-api\2.0.16\slf4j-api-2.0.16.jar;D:\apache-maven-3.9.9\org\springframework\spring-core\6.1.17\spring-core-6.1.17.jar;D:\apache-maven-3.9.9\org\springframework\spring-jcl\6.1.17\spring-jcl-6.1.17.jar;D:\apache-maven-3.9.9\com\baomidou\mybatis-plus-boot-starter\3.4.1\mybatis-plus-boot-starter-3.4.1.jar;D:\apache-maven-3.9.9\com\baomidou\mybatis-plus\3.4.1\mybatis-plus-3.4.1.jar;D:\apache-maven-3.9.9\com\baomidou\mybatis-plus-extension\3.4.1\mybatis-plus-extension-3.4.1.jar;D:\apache-maven-3.9.9\com\baomidou\mybatis-plus-core\3.4.1\mybatis-plus-core-3.4.1.jar;D:\apache-maven-3.9.9\com\baomidou\mybatis-plus-annotation\3.4.1\mybatis-plus-annotation-3.4.1.jar;D:\apache-maven-3.9.9\com\github\jsqlparser\jsqlparser\3.2\jsqlparser-3.2.jar;D:\apache-maven-3.9.9\org\mybatis\mybatis\3.5.6\mybatis-3.5.6.jar;D:\apache-maven-3.9.9\org\mybatis\mybatis-spring\2.0.5\mybatis-spring-2.0.5.jar;D:\apache-maven-3.9.9\org\springframework\boot\spring-boot-autoconfigure\3.3.9\spring-boot-autoconfigure-3.3.9.jar;D:\apache-maven-3.9.9\org\springframework\boot\spring-boot-starter-jdbc\3.3.9\spring-boot-starter-jdbc-3.3.9.jar;D:\apache-maven-3.9.9\com\zaxxer\HikariCP\5.1.0\HikariCP-5.1.0.jar;D:\apache-maven-3.9.9\org\springframework\spring-jdbc\6.1.17\spring-jdbc-6.1.17.jar;D:\apache-maven-3.9.9\org\springframework\spring-tx\6.1.17\spring-tx-6.1.17.jar;D:\apache-maven-3.9.9\org\springframework\boot\spring-boot-starter-actuator\3.3.9\spring-boot-starter-actuator-3.3.9.jar;D:\apache-maven-3.9.9\org\springframework\boot\spring-boot-actuator-autoconfigure\3.3.9\spring-boot-actuator-autoconfigure-3.3.9.jar;D:\apache-maven-3.9.9\org\springframework\boot\spring-boot-actuator\3.3.9\spring-boot-actuator-3.3.9.jar;D:\apache-maven-3.9.9\io\micrometer\micrometer-observation\1.13.11\micrometer-observation-1.13.11.jar;D:\apache-maven-3.9.9\io\micrometer\micrometer-commons\1.13.11\micrometer-commons-1.13.11.jar;D:\apache-maven-3.9.9\io\micrometer\micrometer-jakarta9\1.13.11\micrometer-jakarta9-1.13.11.jar;D:\apache-maven-3.9.9\io\micrometer\micrometer-core\1.13.11\micrometer-core-1.13.11.jar;D:\apache-maven-3.9.9\org\hdrhistogram\HdrHistogram\2.2.2\HdrHistogram-2.2.2.jar;D:\apache-maven-3.9.9\org\latencyutils\LatencyUtils\2.0.3\LatencyUtils-2.0.3.jar com.wms.WmsApplication . ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v3.3.9) 2025-06-20T16:58:03.005+08:00 INFO 25708 --- [ main] com.wms.WmsApplication : Starting WmsApplication using Java 23.0.1 with PID 25708 (E:\springboot_vue_wms\wms\target\classes started by GJ in E:\springboot_vue_wms) 2025-06-20T16:58:03.007+08:00 INFO 25708 --- [ main] com.wms.WmsApplication : No active profile set, falling back to 1 default profile: "default" 2025-06-20T16:58:03.304+08:00 WARN 25708 --- [ main] o.s.boot.actuate.endpoint.EndpointId : Endpoint ID 'health.info' contains invalid characters, please migrate to a valid format. 2025-06-20T16:58:04.035+08:00 INFO 25708 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port 8090 (http) 2025-06-20T16:58:04.047+08:00 INFO 25708 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat] 2025-06-20T16:58:04.047+08:00 INFO 25708 --- [ main] o.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/10.1.36] 2025-06-20T16:58:04.093+08:00 INFO 25708 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext 2025-06-20T16:58:04.094+08:00 INFO 25708 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1036 ms 2025-06-20T16:58:04.207+08:00 WARN 25708 --- [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'helloController': Unsatisfied dependency expressed through field 'userService': Error creating bean with name 'userServiceImpl': Injection of resource dependencies failed 2025-06-20T16:58:04.209+08:00 INFO 25708 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat] 2025-06-20T16:58:04.221+08:00 INFO 25708 --- [ main] .s.b.a.l.ConditionEvaluationReportLogger : Error starting ApplicationContext. To display the condition evaluation report re-run your application with 'debug' enabled. 2025-06-20T16:58:04.235+08:00 ERROR 25708 --- [ main] o.s.boot.SpringApplication : Application run failed org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'helloController': Unsatisfied dependency expressed through field 'userService': Error creating bean with name 'userServiceImpl': Injection of resource dependencies failed at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:788) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:768) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:145) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:509) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1439) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:599) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:522) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:337) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:335) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:975) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:971) ~[spring-context-6.1.17.jar:6.1.17] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:625) ~[spring-context-6.1.17.jar:6.1.17] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146) ~[spring-boot-3.3.9.jar:3.3.9] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754) ~[spring-boot-3.3.9.jar:3.3.9] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:456) ~[spring-boot-3.3.9.jar:3.3.9] at org.springframework.boot.SpringApplication.run(SpringApplication.java:335) ~[spring-boot-3.3.9.jar:3.3.9] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1363) ~[spring-boot-3.3.9.jar:3.3.9] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1352) ~[spring-boot-3.3.9.jar:3.3.9] at com.wms.WmsApplication.main(WmsApplication.java:11) ~[classes/:na] Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userServiceImpl': Injection of resource dependencies failed at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessProperties(CommonAnnotationBeanPostProcessor.java:371) ~[spring-context-6.1.17.jar:6.1.17] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1439) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:599) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:522) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:337) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:335) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:254) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1448) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1358) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:785) ~[spring-beans-6.1.17.jar:6.1.17] ... 20 common frames omitted Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userMapper' defined in file [E:\springboot_vue_wms\wms\target\classes\com\wms\mapper\UserMapper.class]: Property 'sqlSessionFactory' or 'sqlSessionTemplate' are required at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1806) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:600) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:522) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:337) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:335) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:205) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.resolveBeanByName(AbstractAutowireCapableBeanFactory.java:461) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.autowireResource(CommonAnnotationBeanPostProcessor.java:605) ~[spring-context-6.1.17.jar:6.1.17] at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.getResource(CommonAnnotationBeanPostProcessor.java:576) ~[spring-context-6.1.17.jar:6.1.17] at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor$ResourceElement.getResourceToInject(CommonAnnotationBeanPostProcessor.java:738) ~[spring-context-6.1.17.jar:6.1.17] at org.springframework.beans.factory.annotation.InjectionMetadata$InjectedElement.inject(InjectionMetadata.java:270) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:145) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessProperties(CommonAnnotationBeanPostProcessor.java:368) ~[spring-context-6.1.17.jar:6.1.17] ... 31 common frames omitted Caused by: java.lang.IllegalArgumentException: Property 'sqlSessionFactory' or 'sqlSessionTemplate' are required at org.springframework.util.Assert.notNull(Assert.java:172) ~[spring-core-6.1.17.jar:6.1.17] at org.mybatis.spring.support.SqlSessionDaoSupport.checkDaoConfig(SqlSessionDaoSupport.java:122) ~[mybatis-spring-2.0.5.jar:2.0.5] at org.mybatis.spring.mapper.MapperFactoryBean.checkDaoConfig(MapperFactoryBean.java:73) ~[mybatis-spring-2.0.5.jar:2.0.5] at org.springframework.dao.support.DaoSupport.afterPropertiesSet(DaoSupport.java:44) ~[spring-tx-6.1.17.jar:6.1.17] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1853) ~[spring-beans-6.1.17.jar:6.1.17] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1802) ~[spring-beans-6.1.17.jar:6.1.17] ... 44 common frames omitted 进程已结束,退出代码为 1 还是错误
06-21
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