整合mybatis-plus报错Unsatisfied dependency expressed through field ‘baseMapper‘:

2023-12-01T21:12:43.843+08:00 ERROR 28824 --- [  restartedMain] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'paymentController': Injection of resource dependencies failed
	at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessProperties(CommonAnnotationBeanPostProcessor.java:323) ~[spring-context-6.0.11.jar:6.0.11]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1416) ~[spring-beans-6.0.11.jar:6.0.11]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:597) ~[spring-beans-6.0.11.jar:6.0.11]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:520) ~[spring-beans-6.0.11.jar:6.0.11]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:326) ~[spring-beans-6.0.11.jar:6.0.11]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-6.0.11.jar:6.0.11]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:324) ~[spring-beans-6.0.11.jar:6.0.11]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200) ~[spring-beans-6.0.11.jar:6.0.11]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:973) ~[spring-beans-6.0.11.jar:6.0.11]
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:942) ~[spring-context-6.0.11.jar:6.0.11]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:608) ~[spring-context-6.0.11.jar:6.0.11]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146) ~[spring-boot-3.0.9.jar:3.0.9]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:732) ~[spring-boot-3.0.9.jar:3.0.9]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:434) ~[spring-boot-3.0.9.jar:3.0.9]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:310) ~[spring-boot-3.0.9.jar:3.0.9]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1304) ~[spring-boot-3.0.9.jar:3.0.9]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1293) ~[spring-boot-3.0.9.jar:3.0.9]
	at com.mypro.springcloud.Payment8081Application.main(Payment8081Application.java:11) ~[classes/:na]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na]
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
	at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na]
	at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:50) ~[spring-boot-devtools-3.0.9.jar:3.0.9]

关于这个错误，网上的那些方法比如加@Mapper或者@MapperScan之类，我都试过，对我没有用。

我是在跟着尚硅谷学习的springcloud的过程中遇到，因为尚硅谷的老师讲课的版本比较老了，所以所有版本都是我自己改的，这也就造成悲剧——报错Unsatisfied dependency expressed through field 'baseMapper'。就是因为版本问题，版本不兼容（问chatgpt的时候它给出的可能性之一），但是我不知道哪个版本是不兼容的那个，又要改成什么版本。（如果有网友知道该怎么辨别的话，可以发在评论区供大家一起学习）。

但是我想到了我要使用的springboot的版本是3x，spring-boot-starter-parent里面是整合了很多第三方组件的版本，那么我就直接将自己使用的改成spring-boot-starter-parent内置的一样就行了。果不其然，成功了。

改后的：

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>17</maven.compiler.source>
    <maven.compiler.target>17</maven.compiler.target>
    <junit.version>4.13.2</junit.version>
    <log4j.version>1.2.17</log4j.version>
    <lombok.version>1.18.28</lombok.version>
    <mysql.version>8.1.0</mysql.version>
    <druid.version>1.2.19</druid.version>
    <mybatis.plus.spring.boot.version>3.5.3</mybatis.plus.spring.boot.version
</properties>

主要是改了druid的版本和mybatis-plus的版本。

这个主要是给大家提供一个新的解决方向。