java.lang.IllegalArgumentException: Invalid value type for attribute 'factoryBeanObjectType': java.lang.String 	at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getTypeForFactoryBeanFromAttributes(FactoryBeanRegistrySupport.java:86) 	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getTypeForFactoryBean(AbstractAutowireCapableBeanFactory.java:837) 	at org.springframework.beans.factory.support.AbstractBeanFactory.isTypeMatch(AbstractBeanFactory.java:652) 	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doGetBeanNamesForType(DefaultListableBeanFactory.java:575) 	at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:534) 	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:138) 	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:788) 	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:606) 	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146) 	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754) 	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:456) 	at org.springframework.boot.SpringApplication.run(SpringApplication.java:334) 	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1354) 	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1343) 	at cn.com.profitpilot.parcel.ParcelProfitPilotApplication.main(ParcelProfitPilotApplication.java:12) 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) 	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 	at java.base/java.lang.reflect.Method.invoke(Method.java:568) 	at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:50) 

在使用mybatisplus的时候配置正确，引入依赖的时候报以上的异常；

                    com.baomidou             mybatis-plus-boot-starter             3.5.6                               com.mysql             mysql-connector-j             8.4.0          

根据异常信息大概判断是bean装配类型不匹配。

这里看mybatisplus这个包依赖mybatis-spring:2.1.2 ，有可能是这个依赖包版本低导致的，所以我先把这个包更新到新的版本看一下问题能否解决。

                      com.baomidou             mybatis-plus-boot-starter             3.5.6                                                   org.mybatis                     mybatis-spring                                                             org.mybatis             mybatis-spring             3.0.3          

我们引入3.0.3版本，测试再没法发现之前的异常，可以从数据库中读写数据了，间接的证明的问题就在包依赖上。