今天笔者用Springboot框架整合Mybatis做一个小小的项目：
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘myController‘: Unsatisfied dependency expressed through field ‘studentServiceImpl‘; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘studentServiceImpl‘: Unsatisfied dependency expressed through field ‘studentDao‘; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘studentDao‘ defined in file [F:\project\sbhelloworld\target\classes\com\example\sbhelloworld\dao\StudentDao.class]: Invocation of init method Failed; nested exception is java.lang.IllegalArgumentException: Property ‘sqlSessionFactory‘ or ‘sqlSessionTemplate‘ are required at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:596) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessproperties(AutowiredAnnotationBeanPostProcessor.java:374) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.populateBean(AbstractAutowireCapablebeanfactory.java:1411) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.doCreateBean(AbstractAutowireCapablebeanfactory.java:592) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.createBean(AbstractAutowireCapablebeanfactory.java:515) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.support.Abstractbeanfactory.lambda$doGetBean$0(Abstractbeanfactory.java:320) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.support.Abstractbeanfactory.doGetBean(Abstractbeanfactory.java:318) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.support.Abstractbeanfactory.getBean(Abstractbeanfactory.java:199) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.support.DefaultListablebeanfactory.preInstantiateSingletons(DefaultListablebeanfactory.java:845) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.context.support.AbstractApplicationContext.finishbeanfactoryInitialization(AbstractApplicationContext.java:877) ~[spring-context-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549) ~[spring-context-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:742) [spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:389) [spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:311) [spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1213) [spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1202) [spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE] at com.example.sbhelloworld.SbhelloworldApplication.main(SbhelloworldApplication.java:12) [classes/:na] Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘studentServiceImpl‘: Unsatisfied dependency expressed through field ‘studentDao‘; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘studentDao‘ defined in file [F:\project\sbhelloworld\target\classes\com\example\sbhelloworld\dao\StudentDao.class]: Invocation of init method Failed; nested exception is java.lang.IllegalArgumentException: Property ‘sqlSessionFactory‘ or ‘sqlSessionTemplate‘ are required at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:596) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessproperties(AutowiredAnnotationBeanPostProcessor.java:374) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.populateBean(AbstractAutowireCapablebeanfactory.java:1411) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.doCreateBean(AbstractAutowireCapablebeanfactory.java:592) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.createBean(AbstractAutowireCapablebeanfactory.java:515) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.support.Abstractbeanfactory.lambda$doGetBean$0(Abstractbeanfactory.java:320) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.support.Abstractbeanfactory.doGetBean(Abstractbeanfactory.java:318) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.support.Abstractbeanfactory.getBean(Abstractbeanfactory.java:199) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:277) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.support.DefaultListablebeanfactory.doResolveDependency(DefaultListablebeanfactory.java:1251) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.support.DefaultListablebeanfactory.resolveDependency(DefaultListablebeanfactory.java:1171) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:593) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] ... 19 common frames omitted Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘studentDao‘ defined in file [F:\project\sbhelloworld\target\classes\com\example\sbhelloworld\dao\StudentDao.class]: Invocation of init method Failed; nested exception is java.lang.IllegalArgumentException: Property ‘sqlSessionFactory‘ or ‘sqlSessionTemplate‘ are required at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.initializeBean(AbstractAutowireCapablebeanfactory.java:1778) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.doCreateBean(AbstractAutowireCapablebeanfactory.java:593) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.createBean(AbstractAutowireCapablebeanfactory.java:515) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.support.Abstractbeanfactory.lambda$doGetBean$0(Abstractbeanfactory.java:320) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.support.Abstractbeanfactory.doGetBean(Abstractbeanfactory.java:318) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.support.Abstractbeanfactory.getBean(Abstractbeanfactory.java:199) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:277) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.support.DefaultListablebeanfactory.doResolveDependency(DefaultListablebeanfactory.java:1251) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.support.DefaultListablebeanfactory.resolveDependency(DefaultListablebeanfactory.java:1171) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:593) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] ... 32 common frames omitted Caused by: java.lang.IllegalArgumentException: Property ‘sqlSessionFactory‘ or ‘sqlSessionTemplate‘ are required at org.springframework.util.Assert.notNull(Assert.java:198) ~[spring-core-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.mybatis.spring.support.sqlSessionDaoSupport.checkDaoConfig(sqlSessionDaoSupport.java:74) ~[mybatis-spring-1.3.2.jar:1.3.2] at org.mybatis.spring.mapper.Mapperfactorybean.checkDaoConfig(Mapperfactorybean.java:73) ~[mybatis-spring-1.3.2.jar:1.3.2] at org.springframework.dao.support.DaoSupport.afterPropertiesSet(DaoSupport.java:44) ~[spring-tx-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.invokeInitMethods(AbstractAutowireCapablebeanfactory.java:1837) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.initializeBean(AbstractAutowireCapablebeanfactory.java:1774) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE] ... 42 common frames omitted
错误的原因：项目pom.xml 中mybatis依赖包导入错误。笔者项目中错误的依赖包如下：
<dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.4.6</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.3.2</version> </dependency>
解决方法：把上面错误的 mybatis 和 mybatis-spring 依赖包删除，重新导入 mybatis-spring-boot-starter jar 包
<dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.2</version> </dependency>
重新运行项目，项目启动成功，正确运行。
正确的完整的项目 pom.xml 文件如下
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.6.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.example</groupId> <artifactId>sbhelloworld</artifactId> <version>0.0.1-SNAPSHOT</version> <name>sbhelloworld</name> <description>Onlie-Shopping project for Spring Boot</description> <properties> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web-services</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>org.xmlunit</groupId> <artifactId>xmlunit-core</artifactId> </dependency> <dependency> <groupId>org.xmlunit</groupId> <artifactId>xmlunit-core</artifactId> </dependency> <!-- <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.4.6</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.3.2</version> </dependency>--> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.2</version> </dependency> <dependency> <groupId>MysqL</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
参考的原文链接：https://blog.csdn.net/lixiaxin200319/article/details/86599201
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