【日常Exception】第三十六回：The processing instruction target matching “[xX][mM][lL]“ is not allowed.

左手的ㄟ右手 2024-03-27 14:44 43阅读 0赞

## 1、问题 ##

报错主要问题：

> **Cause: org.xml.sax.SAXParseException; lineNumber: 3; columnNumber: 6; The processing instruction target matching "\[xX\]\[mM\]\[lL\]" is not allowed.**

报错全文：

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'mailConfigController': Unsatisfied dependency expressed through field 'mail
    ConfigService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name '***ConfigServiceImpl': Unsatisfied d
    ependency expressed through field 'baseMapper'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '***Mapp
    er' defined in URL [jar:file:/app/***-***-1.0-SNAPSHOT.jar!/BOOT-INF/classes!***/***/***/**ConfigMapper.class]: Cannot resolve reference 
    to bean '***SqlSessionFactory' while setting bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creatin
    g bean with name '***SqlSessionFactory' defined in class path resource [***/***/***/***Configuration.class]: Bean instantiation via factory metho
    d failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'set
    SqlSessionFactory' threw exception; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'URL [jar:file:/app/***-***-
    1.0-SNAPSHOT.jar!/BOOT-INF/classes!/mapper/***Mapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error creating document instance. 
     Cause: org.xml.sax.SAXParseException; lineNumber: 3; columnNumber: 6; The processing instruction target matching "[xX][mM][lL]" is not allowed.
            at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:643)
            at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:130)
            at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399)
            at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1422)
            at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594)
            at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517)
            at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323)
            at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
            at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321)
            at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
            at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:879)
            at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878)
            at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550)
            at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141)
            at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747)
            at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
            at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
            at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
            at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215)
            at ***/***/***/***Startup.main(***Startup.java:28)
            at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
            at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
            at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
            at java.lang.reflect.Method.invoke(Method.java:498)
            at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48)
            at org.springframework.boot.loader.Launcher.launch(Launcher.java:87)
            at org.springframework.boot.loader.Launcher.launch(Launcher.java:51)
            at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:52)
    Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name '***ConfigServiceImpl': Unsatisfied dependency expressed throu
    gh field 'baseMapper'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '***ConfigMapper' defined in URL [jar:f
    ile:/app/***-***-1.0-SNAPSHOT.jar!/BOOT-INF/classes!***/***/***/***ConfigMapper.class]: Cannot resolve reference to bean '***SqlSessionF
    actory' while setting bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '***Sq
            at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
            at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
            at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215)
            at ***/***/***/***Startup.main(***Startup.java:28)
            at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
            at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
            at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
            at java.lang.reflect.Method.invoke(Method.java:498)
            at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48)
            at org.springframework.boot.loader.Launcher.launch(Launcher.java:87)
            at org.springframework.boot.loader.Launcher.launch(Launcher.java:51)
            at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:52)

--------------------

## **2、解决方式** ##

删除xml文件的头部空行，如图：

![8e5b788c4c0a4ce5b4d4e137a61d49d3.png][]

[8e5b788c4c0a4ce5b4d4e137a61d49d3.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/27/b1b07bd5295b4860ba6b0fb19d9f235e.png