SpringBoot启动报错：org.springframework.beans.factory.UnsatisfiedDependencyException Error creating

完整报错如下：太长，把我认为重要信息用下划线标重点。

WARN 7612 — [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘processBusinessController’: Unsatisfied dependency expressed through field ‘userService’; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘userService’: Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘userMapper’ defined in file [F:code ariacs5g ariacs5g_src ariacs5g-parent ariacs5g-power-parent2 ariacs5g-host-service2 argetclassescom ariacshostmapperUserMapper.class]: Unsatisfied dependency expressed through bean property ‘sqlSessionFactory’; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘sqlSessionFactory’ defined in class path resource [com/baomidou/mybatisplus/autoconfigure/MybatisPlusAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method ‘sqlSessionFactory’ threw exception; nested exception is java.lang.NoClassDefFoundError: org/mybatis/logging/LoggerFactory
2020-12-25 21:55:07.728 INFO 7612 — [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2020-12-25 21:55:07.737 INFO 7612 — [ main] ConditionEvaluationReportLoggingListener :

Error starting ApplicationContext. To display the conditions report re-run your application with ‘debug’ enabled.
2020-12-25 21:55:07.757 ERROR 7612 — [ main] o.s.boot.SpringApplication : Application run failed

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘processBusinessController’: Unsatisfied dependency expressed through field ‘userService’; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘userService’: Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘userMapper’ defined in file [F:code ariacs5g ariacs5g_src ariacs5g-parent ariacs5g-power-parent2 ariacs5g-host-service2 argetclassescom ariacshostmapperUserMapper.class]: Unsatisfied dependency expressed through bean property ‘sqlSessionFactory’; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘sqlSessionFactory’ defined in class path resource [com/baomidou/mybatisplus/autoconfigure/MybatisPlusAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method ‘sqlSessionFactory’ threw exception; nested exception is java.lang.NoClassDefFoundError: org/mybatis/logging/LoggerFactory
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessorKaTeX parse error: Undefined control sequence: \[ at position 78: …sor.java:598) ~\̲[̲spring-beans-5.…doGetBeanKaTeX parse error: Undefined control sequence: \[ at position 34: …ory.java:321) ~\̲[̲spring-beans-5.…doGetBeanKaTeX parse error: Undefined control sequence: \[ at position 34: …ory.java:321) ~\̲[̲spring-beans-5.…AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:595) ~[spring-beans-5.1.18.RELEASE.jar:5.1.18.RELEASE]
… 19 common frames omitted
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘userMapper’ defined in file [F:code ariacs5g ariacs5g_src ariacs5g-parent ariacs5g-power-parent2 ariacs5g-host-service2 argetclassescom ariacshostmapperUserMapper.class]: Unsatisfied dependency expressed through bean property ‘sqlSessionFactory’; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘sqlSessionFactory’ defined in class path resource [com/baomidou/mybatisplus/autoconfigure/MybatisPlusAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method ‘sqlSessionFactory’ threw exception; nested exception is java.lang.NoClassDefFoundError: org/mybatis/logging/LoggerFactory
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireByType(AbstractAutowireCapableBeanFactory.java:1506) ~[spring-beans-5.1.18.RELEASE.jar:5.1.18.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1386) ~[spring-beans-5.1.18.RELEASE.jar:5.1.18.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:591) ~[spring-beans-5.1.18.RELEASE.jar:5.1.18.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:514) ~[spring-beans-5.1.18.RELEASE.jar:5.1.18.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBeanKaTeX parse error: Undefined control sequence: \[ at position 34: …ory.java:321) ~\̲[̲spring-beans-5.…ResourceElement.getResourceToInject(CommonAnnotationBeanPostProcessor.java:637) ~[spring-context-5.1.18.RELEASE.jar:5.1.18.RELEASE]
at org.springframework.beans.factory.annotation.InjectionMetadataKaTeX parse error: Undefined control sequence: \[ at position 53: …ata.java:180) ~\̲[̲spring-beans-5.…doGetBeanKaTeX parse error: Undefined control sequence: \[ at position 34: …ory.java:321) ~\̲[̲spring-beans-5.…$EnhancerBySpringCGLIB$$602d46a8.CGLIB$sqlSessionFactoryKaTeX parse error: Undefined control sequence: \[ at position 17: …(<generated>) ~\̲[̲mybatis-plus-bo…$EnhancerBySpringCGLIB$$602d46a8$$FastClassBySpringCGLIB$KaTeX parse error: Undefined control sequence: \[ at position 31: …(<generated>) ~\̲[̲mybatis-plus-bo…BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:363) ~[spring-context-5.1.18.RELEASE.jar:5.1.18.RELEASE]
at com.baomidou.mybatisplus.autoconfigure.MybatisPlusAutoConfiguration$$EnhancerBySpringCGLIB$$602d46a8.sqlSessionFactory() ~[mybatis-plus-boot-starter-3.4.1.jar:3.4.1]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_152]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_152]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_152]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_152]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.1.18.RELEASE.jar:5.1.18.RELEASE]
… 58 common frames omitted
Caused by: java.lang.ClassNotFoundException: org.mybatis.logging.LoggerFactory
at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_152]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_152]
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338) ~[na:1.8.0_152]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_152]
… 70 common frames omitted

我们大概知道是创建Controller,Service,Mapper实例失败，这是第一点。看到SqlSessionFactory，想都不用想，肯定是底层Mybatis与数据库交互出现问题，这是其二。

废话不多说，解决方法：Mybatis和Mybatis-plus同时引入依赖中会引起冲突，二选其一。我们除了注意本模块的pom文件中是否冲突，还要看看本模块的父模块是否已经引入了mybaits依赖，而后来你又在本模块引入了Mybatis-plus模块，导致冲突。这种情形比较隐蔽不易发现。