今天学习springcloud的时候，手动导入关于springboot和springcloud的jar包，启动代码的时候发现出了一大段问题：
2022-09-14 22:30:38.800 ERROR 15520 --- main o.s.boot.SpringApplication : Application run failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'deptController': Unsatisfied dependency expressed through field 'deptService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'deptServiceImpl': Unsatisfied dependency expressed through field 'deptDao'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'deptDao' defined in file C:UsersCharonIdeaProjectsspringcloudspringcloud-provider-dept-8001 argetclassescomspringcloudDaoDeptDao.class: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'sqlSessionFactory' defined in class path resource org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class: Unsatisfied dependency expressed through method 'sqlSessionFactory' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource org/springframework/boot/autoconfigure/jdbc/DataSourceConfigurationKaTeX parse error: Can't use function '\\' in math mode at position 14: Generic.class\̲]̲: Bean instanti...AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:659) ~spring-beans-5.3.22.jar:5.3.22
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessorKaTeX parse error: Undefined control sequence: \ at position 78: ...sor.java:639) \~\\̲\[̲spring-beans-5....doGetBeanKaTeX parse error: Undefined control sequence: \\\[ at position 34: ...ory.java:335) \~\\̲\[̲spring-beans-5....Generic.class: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate javax.sql.DataSource: Factory method 'dataSource' threw exception; nested exception is java.lang.NoSuchMethodError: org.springframework.boot.jdbc.EmbeddedDatabaseConnection.isEmbedded(Ljava/lang/String;)Z
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessorKaTeX parse error: Undefined control sequence: \ at position 89: ...sor.java:659) \~\\̲\[̲spring-beans-5....AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:639) \~\[spring-beans-5.3.22.jar:5.3.22
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) ~spring-beans-5.3.22.jar:5.3.22
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~spring-beans-5.3.22.jar:5.3.22
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1431) ~spring-beans-5.3.22.jar:5.3.22
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:619) ~spring-beans-5.3.22.jar:5.3.22
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~spring-beans-5.3.22.jar:5.3.22
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBeanKaTeX parse error: Undefined control sequence: \ at position 34: ...ory.java:335) \~\\̲\[̲spring-beans-5....AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:656) \~\[spring-beans-5.3.22.jar:5.3.22
... 20 common frames omitted
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'deptDao' defined in file C:UsersCharonIdeaProjectsspringcloudspringcloud-provider-dept-8001 argetclassescomspringcloudDaoDeptDao.class: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'sqlSessionFactory' defined in class path resource org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class: Unsatisfied dependency expressed through method 'sqlSessionFactory' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource org/springframework/boot/autoconfigure/jdbc/DataSourceConfigurationKaTeX parse error: Can't use function '\\' in math mode at position 14: Generic.class\̲]̲: Bean instanti...doGetBeanKaTeX parse error: Undefined control sequence: \ at position 34: ...ory.java:335) \~\\̲\[̲spring-beans-5....AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:656) \~\[spring-beans-5.3.22.jar:5.3.22
... 34 common frames omitted
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'sqlSessionFactory' defined in class path resource org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class: Unsatisfied dependency expressed through method 'sqlSessionFactory' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource org/springframework/boot/autoconfigure/jdbc/DataSourceConfigurationKaTeX parse error: Can't use function '\\' in math mode at position 14: Generic.class\̲]̲: Bean instanti...doGetBeanKaTeX parse error: Undefined control sequence: \ at position 34: ...ory.java:335) \~\\̲\[̲spring-beans-5....Generic.class: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate javax.sql.DataSource: Factory method 'dataSource' threw exception; nested exception is java.lang.NoSuchMethodError: org.springframework.boot.jdbc.EmbeddedDatabaseConnection.isEmbedded(Ljava/lang/String;)Z
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:658) ~spring-beans-5.3.22.jar:5.3.22
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:638) ~spring-beans-5.3.22.jar:5.3.22
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1352) ~spring-beans-5.3.22.jar:5.3.22
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1195) ~spring-beans-5.3.22.jar:5.3.22
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582) ~spring-beans-5.3.22.jar:5.3.22
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~spring-beans-5.3.22.jar:5.3.22
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBeanKaTeX parse error: Undefined control sequence: \ at position 34: ...ory.java:335) \~\\̲\[̲spring-beans-5....Generic.dataSource(DataSourceConfiguration.java:122) \~\[spring-boot-autoconfigure-2.3.0.RELEASE.jar:2.3.0.RELEASE
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~na:1.8.0_342
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~na:1.8.0_342
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~na:1.8.0_342
at java.lang.reflect.Method.invoke(Method.java:498) ~na:1.8.0_342
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~spring-beans-5.3.22.jar:5.3.22
... 73 common frames omitted
上网查到了许多解决方案，进行逐一尝试
1、相关的注释没给到位
重复检查controller层的@Restcontroller service层的@service 和dao层的@mapper,发现没有任何错误，不是这个问题
2、yml配置文件出错
先检查yml配置文件的内容，datasource没问题，mybatis的配置也没问题，排除内容出错，上网查到了可能是配置文件的路径发生错误，yml没有读取到，重复更改yml的路径，甚至使用propreties文件，也没能解决问题，于是排除配置文件的问题
3.发生版本冲突
可能使用pom的时候导入的springboot和springcloud发生冲突，或者重复导入多个jar包，idea不知道识别哪一个文件，查看所有依赖的版本，发现springboot的版本和spring的版本都有重复，且不一致，还可能与springcloud的版本发生冲突，于是查询最适合的springboot版本和与其对应的springcloud的版本，1、SpringCloud： Hoxton.SR8
2、SpringBoot：2.3.3.RELEASE
重新创建一个maven，并将之前的代码复制粘贴，只改变springboot和springcloud的版本，最后成功运行