描绘
在学习MyBatis的时分，遇到了这样的异常，而且总是一开始类上面标红，点进去的时分赤色下划线就消失了，就像在跟他人玩捉迷藏一样。感觉大概率又是编码问题，但在类里边又彻底发现不了什么东西，首要去问一下Google。
处理
Google了之后发现原来是编码方法变成了 UTF-8 BOM，那只需把编码方法改成UTF-8就行了
总结
不过这是个很严重的问题，为啥我没有去碰编码方法，而它却主动改成了UTF-8 BOM呢？
而且UTF-8 BOM跟UTF-8又有啥区别呢？
新问题
问题处理之后，测验再次发动，这次呈现了新的过错。
"C:\Program Files\Java\jdk1.8.0_192\bin\java.exe" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2020.3.4\lib\idea_rt.jar=63188:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2020.3.4\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_192\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\rt.jar;C:\Users\27208\Desktop\ComputerScience\Learning\Examples\SpringExamples\HelloMyBatis\target\classes;C:\Users\27208.m2\repository\org\springframework\boot\spring-boot-starter-web\2.7.10\spring-boot-starter-web-2.7.10.jar;C:\Users\27208.m2\repository\org\springframework\boot\spring-boot-starter\2.7.10\spring-boot-starter-2.7.10.jar;C:\Users\27208.m2\repository\org\springframework\boot\spring-boot-starter-logging\2.7.10\spring-boot-starter-logging-2.7.10.jar;C:\Users\27208.m2\repository\ch\qos\logback\logback-classic\1.2.11\logback-classic-1.2.11.jar;C:\Users\27208.m2\repository\ch\qos\logback\logback-core\1.2.11\logback-core-1.2.11.jar;C:\Users\27208.m2\repository\org\apache\logging\log4j\log4j-to-slf4j\2.17.2\log4j-to-slf4j-2.17.2.jar;C:\Users\27208.m2\repository\org\apache\logging\log4j\log4j-api\2.17.2\log4j-api-2.17.2.jar;C:\Users\27208.m2\repository\org\slf4j\jul-to-slf4j\1.7.36\jul-to-slf4j-1.7.36.jar;C:\Users\27208.m2\repository\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;C:\Users\27208.m2\repository\org\yaml\snakeyaml\1.30\snakeyaml-1.30.jar;C:\Users\27208.m2\repository\org\springframework\boot\spring-boot-starter-json\2.7.10\spring-boot-starter-json-2.7.10.jar;C:\Users\27208.m2\repository\com\fasterxml\jackson\core\jackson-databind\2.13.5\jackson-databind-2.13.5.jar;C:\Users\27208.m2\repository\com\fasterxml\jackson\core\jackson-annotations\2.13.5\jackson-annotations-2.13.5.jar;C:\Users\27208.m2\repository\com\fasterxml\jackson\core\jackson-core\2.13.5\jackson-core-2.13.5.jar;C:\Users\27208.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.13.5\jackson-datatype-jdk8-2.13.5.jar;C:\Users\27208.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.13.5\jackson-datatype-jsr310-2.13.5.jar;C:\Users\27208.m2\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.13.5\jackson-module-parameter-names-2.13.5.jar;C:\Users\27208.m2\repository\org\springframework\boot\spring-boot-starter-tomcat\2.7.10\spring-boot-starter-tomcat-2.7.10.jar;C:\Users\27208.m2\repository\org\apache\tomcat\embed\tomcat-embed-core\9.0.73\tomcat-embed-core-9.0.73.jar;C:\Users\27208.m2\repository\org\apache\tomcat\embed\tomcat-embed-el\9.0.73\tomcat-embed-el-9.0.73.jar;C:\Users\27208.m2\repository\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.73\tomcat-embed-websocket-9.0.73.jar;C:\Users\27208.m2\repository\org\springframework\spring-web\5.3.26\spring-web-5.3.26.jar;C:\Users\27208.m2\repository\org\springframework\spring-beans\5.3.26\spring-beans-5.3.26.jar;C:\Users\27208.m2\repository\org\springframework\spring-webmvc\5.3.26\spring-webmvc-5.3.26.jar;C:\Users\27208.m2\repository\org\springframework\spring-aop\5.3.26\spring-aop-5.3.26.jar;C:\Users\27208.m2\repository\org\springframework\spring-context\5.3.26\spring-context-5.3.26.jar;C:\Users\27208.m2\repository\org\springframework\spring-expression\5.3.26\spring-expression-5.3.26.jar;C:\Users\27208.m2\repository\org\mybatis\spring\boot\mybatis-spring-boot-starter\2.3.0\mybatis-spring-boot-starter-2.3.0.jar;C:\Users\27208.m2\repository\org\springframework\boot\spring-boot-starter-jdbc\2.7.10\spring-boot-starter-jdbc-2.7.10.jar;C:\Users\27208.m2\repository\com\zaxxer\HikariCP\4.0.3\HikariCP-4.0.3.jar;C:\Users\27208.m2\repository\org\springframework\spring-jdbc\5.3.26\spring-jdbc-5.3.26.jar;C:\Users\27208.m2\repository\org\springframework\spring-tx\5.3.26\spring-tx-5.3.26.jar;C:\Users\27208.m2\repository\org\mybatis\spring\boot\mybatis-spring-boot-autoconfigure\2.3.0\mybatis-spring-boot-autoconfigure-2.3.0.jar;C:\Users\27208.m2\repository\org\mybatis\mybatis\3.5.11\mybatis-3.5.11.jar;C:\Users\27208.m2\repository\org\mybatis\mybatis-spring\2.1.0\mybatis-spring-2.1.0.jar;C:\Users\27208.m2\repository\org\springframework\boot\spring-boot-devtools\2.7.10\spring-boot-devtools-2.7.10.jar;C:\Users\27208.m2\repository\org\springframework\boot\spring-boot\2.7.10\spring-boot-2.7.10.jar;C:\Users\27208.m2\repository\org\springframework\boot\spring-boot-autoconfigure\2.7.10\spring-boot-autoconfigure-2.7.10.jar;C:\Users\27208.m2\repository\com\mysql\mysql-connector-j\8.0.32\mysql-connector-j-8.0.32.jar;C:\Users\27208.m2\repository\org\projectlombok\lombok\1.18.26\lombok-1.18.26.jar;C:\Users\27208.m2\repository\org\slf4j\slf4j-api\1.7.36\slf4j-api-1.7.36.jar;C:\Users\27208.m2\repository\org\springframework\spring-core\5.3.26\spring-core-5.3.26.jar;C:\Users\27208.m2\repository\org\springframework\spring-jcl\5.3.26\spring-jcl-5.3.26.jar" com.zjt.demo.DemoApplication
20:41:52.155 [Thread-0] DEBUG org.springframework.boot.devtools.restart.classloader.RestartClassLoader - Created RestartClassLoader org.springframework.boot.devtools.restart.classloader.RestartClassLoader@5b4d4e76
. ____ _ __ _ _
/\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )___ | '_ | '_| | '_ / _` | \ \ \ \
\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |___, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.7.10)
2023-04-07 20:41:52.599 INFO 27992 --- [ restartedMain] com.zjt.demo.DemoApplication : Starting DemoApplication using Java 1.8.0_192 on LAPTOP-0S6P54MQ with PID 27992 (C:\Users\27208\Desktop\ComputerScience\Learning\Examples\SpringExamples\HelloMyBatis\target\classes started by 27208 in C:\Users\27208\Desktop\ComputerScience\Learning\Examples\SpringExamples\HelloMyBatis)
2023-04-07 20:41:52.600 DEBUG 27992 --- [ restartedMain] com.zjt.demo.DemoApplication : Running with Spring Boot v2.7.10, Spring v5.3.26
2023-04-07 20:41:52.600 INFO 27992 --- [ restartedMain] com.zjt.demo.DemoApplication : The following 1 profile is active: "dev"
2023-04-07 20:41:52.647 INFO 27992 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : Devtools property defaults active! Set 'spring.devtools.add-properties' to 'false' to disable
2023-04-07 20:41:52.647 INFO 27992 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : For additional web related logging consider setting the 'logging.level.web' property to 'DEBUG'
2023-04-07 20:41:53.986 INFO 27992 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2023-04-07 20:41:53.997 INFO 27992 --- [ restartedMain] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2023-04-07 20:41:53.997 INFO 27992 --- [ restartedMain] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.73]
2023-04-07 20:41:54.094 INFO 27992 --- [ restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2023-04-07 20:41:54.095 INFO 27992 --- [ restartedMain] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1448 ms
Logging initialized using 'class org.apache.ibatis.logging.stdout.StdOutImpl' adapter.
2023-04-07 20:41:54.344 WARN 27992 --- [ restartedMain] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userController': 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.BeanCreationException: Error creating bean with name 'userMapper' defined in file [C:\Users\27208\Desktop\ComputerScience\Learning\Examples\SpringExamples\HelloMyBatis\target\classes\com\zjt\demo\mapper\UserMapper.class]: Cannot resolve reference to bean 'sqlSessionTemplate' while setting bean property 'sqlSessionTemplate'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'sqlSessionTemplate' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Unsatisfied dependency expressed through method 'sqlSessionTemplate' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.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.io.IOException: Failed to parse mapping resource: 'file [C:\Users\27208\Desktop\ComputerScience\Learning\Examples\SpringExamples\HelloMyBatis\target\classes\mybatis\ArticleMapper.xml]'
2023-04-07 20:41:54.348 INFO 27992 --- [ restartedMain] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2023-04-07 20:41:54.359 INFO 27992 --- [ restartedMain] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2023-04-07 20:41:54.386 ERROR 27992 --- [ restartedMain] o.s.boot.SpringApplication : Application run failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userController': 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.BeanCreationException: Error creating bean with name 'userMapper' defined in file [C:\Users\27208\Desktop\ComputerScience\Learning\Examples\SpringExamples\HelloMyBatis\target\classes\com\zjt\demo\mapper\UserMapper.class]: Cannot resolve reference to bean 'sqlSessionTemplate' while setting bean property 'sqlSessionTemplate'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'sqlSessionTemplate' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Unsatisfied dependency expressed through method 'sqlSessionTemplate' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.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.io.IOException: Failed to parse mapping resource: 'file [C:\Users\27208\Desktop\ComputerScience\Learning\Examples\SpringExamples\HelloMyBatis\target\classes\mybatis\ArticleMapper.xml]'
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:660) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1431) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:619) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:955) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:920) ~[spring-context-5.3.26.jar:5.3.26]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) ~[spring-context-5.3.26.jar:5.3.26]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:147) ~[spring-boot-2.7.10.jar:2.7.10]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:731) [spring-boot-2.7.10.jar:2.7.10]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:408) [spring-boot-2.7.10.jar:2.7.10]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) [spring-boot-2.7.10.jar:2.7.10]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1303) [spring-boot-2.7.10.jar:2.7.10]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1292) [spring-boot-2.7.10.jar:2.7.10]
at com.zjt.demo.DemoApplication.main(DemoApplication.java:10) [classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_192]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_192]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_192]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_192]
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-2.7.10.jar:2.7.10]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userService': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userMapper' defined in file [C:\Users\27208\Desktop\ComputerScience\Learning\Examples\SpringExamples\HelloMyBatis\target\classes\com\zjt\demo\mapper\UserMapper.class]: Cannot resolve reference to bean 'sqlSessionTemplate' while setting bean property 'sqlSessionTemplate'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'sqlSessionTemplate' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Unsatisfied dependency expressed through method 'sqlSessionTemplate' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.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.io.IOException: Failed to parse mapping resource: 'file [C:\Users\27208\Desktop\ComputerScience\Learning\Examples\SpringExamples\HelloMyBatis\target\classes\mybatis\ArticleMapper.xml]'
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessProperties(CommonAnnotationBeanPostProcessor.java:332) ~[spring-context-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1431) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:619) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1391) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1311) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:657) ~[spring-beans-5.3.26.jar:5.3.26]
... 25 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userMapper' defined in file [C:\Users\27208\Desktop\ComputerScience\Learning\Examples\SpringExamples\HelloMyBatis\target\classes\com\zjt\demo\mapper\UserMapper.class]: Cannot resolve reference to bean 'sqlSessionTemplate' while setting bean property 'sqlSessionTemplate'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'sqlSessionTemplate' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Unsatisfied dependency expressed through method 'sqlSessionTemplate' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.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.io.IOException: Failed to parse mapping resource: 'file [C:\Users\27208\Desktop\ComputerScience\Learning\Examples\SpringExamples\HelloMyBatis\target\classes\mybatis\ArticleMapper.xml]'
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:342) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:113) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1707) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1452) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:619) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:213) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.resolveBeanByName(AbstractAutowireCapableBeanFactory.java:479) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.autowireResource(CommonAnnotationBeanPostProcessor.java:550) ~[spring-context-5.3.26.jar:5.3.26]
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.getResource(CommonAnnotationBeanPostProcessor.java:520) ~[spring-context-5.3.26.jar:5.3.26]
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor$ResourceElement.getResourceToInject(CommonAnnotationBeanPostProcessor.java:673) ~[spring-context-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.annotation.InjectionMetadata$InjectedElement.inject(InjectionMetadata.java:228) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessProperties(CommonAnnotationBeanPostProcessor.java:329) ~[spring-context-5.3.26.jar:5.3.26]
... 36 common frames omitted
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'sqlSessionTemplate' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Unsatisfied dependency expressed through method 'sqlSessionTemplate' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.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.io.IOException: Failed to parse mapping resource: 'file [C:\Users\27208\Desktop\ComputerScience\Learning\Examples\SpringExamples\HelloMyBatis\target\classes\mybatis\ArticleMapper.xml]'
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:800) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:541) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1352) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1195) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:330) ~[spring-beans-5.3.26.jar:5.3.26]
... 52 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.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.io.IOException: Failed to parse mapping resource: 'file [C:\Users\27208\Desktop\ComputerScience\Learning\Examples\SpringExamples\HelloMyBatis\target\classes\mybatis\ArticleMapper.xml]'
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:658) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:638) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1352) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1195) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1391) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1311) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:887) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:791) ~[spring-beans-5.3.26.jar:5.3.26]
... 62 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is java.io.IOException: Failed to parse mapping resource: 'file [C:\Users\27208\Desktop\ComputerScience\Learning\Examples\SpringExamples\HelloMyBatis\target\classes\mybatis\ArticleMapper.xml]'
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.3.26.jar:5.3.26]
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653) ~[spring-beans-5.3.26.jar:5.3.26]
... 76 common frames omitted
Caused by: java.io.IOException: Failed to parse mapping resource: 'file [C:\Users\27208\Desktop\ComputerScience\Learning\Examples\SpringExamples\HelloMyBatis\target\classes\mybatis\ArticleMapper.xml]'
at org.mybatis.spring.SqlSessionFactoryBean.buildSqlSessionFactory(SqlSessionFactoryBean.java:615) ~[mybatis-spring-2.1.0.jar:2.1.0]
at org.mybatis.spring.SqlSessionFactoryBean.afterPropertiesSet(SqlSessionFactoryBean.java:492) ~[mybatis-spring-2.1.0.jar:2.1.0]
at org.mybatis.spring.SqlSessionFactoryBean.getObject(SqlSessionFactoryBean.java:635) ~[mybatis-spring-2.1.0.jar:2.1.0]
at org.mybatis.spring.boot.autoconfigure.MybatisAutoConfiguration.sqlSessionFactory(MybatisAutoConfiguration.java:187) ~[mybatis-spring-boot-autoconfigure-2.3.0.jar:2.3.0]
at org.mybatis.spring.boot.autoconfigure.MybatisAutoConfiguration$$EnhancerBySpringCGLIB$$539d723.CGLIB$sqlSessionFactory$2(<generated>) ~[mybatis-spring-boot-autoconfigure-2.3.0.jar:2.3.0]
at org.mybatis.spring.boot.autoconfigure.MybatisAutoConfiguration$$EnhancerBySpringCGLIB$$539d723$$FastClassBySpringCGLIB$$1ae13dc1.invoke(<generated>) ~[mybatis-spring-boot-autoconfigure-2.3.0.jar:2.3.0]
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244) ~[spring-core-5.3.26.jar:5.3.26]
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:331) ~[spring-context-5.3.26.jar:5.3.26]
at org.mybatis.spring.boot.autoconfigure.MybatisAutoConfiguration$$EnhancerBySpringCGLIB$$539d723.sqlSessionFactory(<generated>) ~[mybatis-spring-boot-autoconfigure-2.3.0.jar:2.3.0]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_192]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_192]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_192]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_192]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.3.26.jar:5.3.26]
... 77 common frames omitted
Caused by: org.apache.ibatis.builder.BuilderException: Error creating document instance. Cause: org.xml.sax.SAXParseException; lineNumber: 11; columnNumber: 17; 文件提前结束。
at org.apache.ibatis.parsing.XPathParser.createDocument(XPathParser.java:263) ~[mybatis-3.5.11.jar:3.5.11]
at org.apache.ibatis.parsing.XPathParser.<init>(XPathParser.java:127) ~[mybatis-3.5.11.jar:3.5.11]
at org.apache.ibatis.builder.xml.XMLMapperBuilder.<init>(XMLMapperBuilder.java:81) ~[mybatis-3.5.11.jar:3.5.11]
at org.mybatis.spring.SqlSessionFactoryBean.buildSqlSessionFactory(SqlSessionFactoryBean.java:612) ~[mybatis-spring-2.1.0.jar:2.1.0]
... 90 common frames omitted
Caused by: org.xml.sax.SAXParseException: 文件提前结束。
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:203) ~[na:1.8.0_192]
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:177) ~[na:1.8.0_192]
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:400) ~[na:1.8.0_192]
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:327) ~[na:1.8.0_192]
at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(XMLScanner.java:1472) ~[na:1.8.0_192]
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:1014) ~[na:1.8.0_192]
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:602) ~[na:1.8.0_192]
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:505) ~[na:1.8.0_192]
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:842) ~[na:1.8.0_192]
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:771) ~[na:1.8.0_192]
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141) ~[na:1.8.0_192]
at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:243) ~[na:1.8.0_192]
at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:339) ~[na:1.8.0_192]
at org.apache.ibatis.parsing.XPathParser.createDocument(XPathParser.java:261) ~[mybatis-3.5.11.jar:3.5.11]
... 93 common frames omitted
Process finished with exit code 0
真是百思不得其解，为啥又变成了Bean目标创立失利了呢？
处理
那这样的话就试一下溯源吧，由于问题的呈现最早是在添加了ArticleInfo类之后才呈现的，那就直接先把一切跟ArticleInfo相关的东西全部注释掉，从未呈现问题的时分测验再次发动，由于在此之前我的项目发动是没有问题的，只需回退到项目发动正常的时分，然后再按着之前的过程再次操作就能渐渐定位到问题的存在了。
把一切跟ArticleInfo相关的东西全都注释掉之后，没想到接下来仍是相同的过错。接着发现了ArticleMapper.xml文件中竟然还有一个小小的赤色下划线，看来xml文件是不允许为空的啊，把整个ArticleMapper.xml文件删除之后，项目就运行成功了。
到这儿，就回退到原先没有问题的状况了，由于 .xml 文件为空时呈现的过错跟 .xml 不为空时呈现的过错是一样的，所以很大概率上问题就呈现在ArticleMapper.xml中。
先来筛查SQL句子，当把 select 标签里边的SQL句子删除之后，项目发动成功！
总结
最终仔细瞪大眼睛一看，原来是由于自己占位符里边什么都没有写……，实在是太不当心了。
不过，如果是.xml文件的问题，那为啥提示的满是目标创立失利呢？彻底没有SQL句子相关的提示，真是有点费事……那是不是说明，在创立Bean目标之前，是先去加载.xml文件的呢？得去好好温习一下Spring项目的生命周期了
再回头看一下前面的报错信息，里边其实也有提示到.xml文件的问题，哦不对！里边有说到sqlSessionFactory，而且还呈现了IO过错，直接定位到ArticleMapper.xml中了，也就是说，SQL句子结构失利的话就会导致IO过错嘛？那MyBatis结构SQL句子然后去数据库中查询的具体原理又是怎样的呢……
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is java.io.IOException: Failed to parse mapping resource: 'file [C:\Users\27208\Desktop\ComputerScience\Learning\Examples\SpringExamples\HelloMyBatis\target\classes\mybatis\ArticleMapper.xml]'
Caused by: java.io.IOException: Failed to parse mapping resource: 'file [C:\Users\27208\Desktop\ComputerScience\Learning\Examples\SpringExamples\HelloMyBatis\target\classes\mybatis\ArticleMapper.xml]'
