我将项目由springboot3.0.5升级为3.2.1时启动报错如下：
2024-01-08 14:59:34.245 ERROR 15604 --- [ main] o.s.boot.SpringApplication : Application run failed

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:836)
at org.springframework.beans.factory.support.AbstractBeanFactory.isTypeMatch(AbstractBeanFactory.java:620)
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:789)
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:762)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:464)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:334)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1358)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1347)

解决：pom.xml的mybatis-spring 版本升级为 3.0.3

<dependency>
                <groupId>com.baomidou</groupId>
                <artifactId>mybatis-plus-spring-boot3-starter</artifactId>
                <version>3.5.5</version>
                <exclusions>
                    <exclusion>
                        <groupId>org.mybatis</groupId>
                        <artifactId>mybatis-spring</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis-spring</artifactId>
                <version>3.0.3</version>
            </dependency>

参考：Spring Boot 升级 3.2 报错 Invalid value type for attribute ‘factoryBeanObjectType‘: java.lang.String_java_有来技术团队-华为开发者联盟HarmonyOS专区 (csdn.net)
https://github.com/mybatis/spring/issues/855
https://github.com/baomidou/mybatis-plus/issues/5808

mybatis-plus-boot-starter（或mybatis-plus-spring-boot3-starter）升级到3.5.5

<dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.5.5</version>
            <exclusions>
                    <exclusion>
                        <groupId>org.mybatis</groupId>
                        <artifactId>mybatis-spring</artifactId>
                    </exclusion>
                </exclusions>
        </dependency>
<dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis-spring</artifactId>
                <version>3.0.3</version>
            </dependency>

或

<dependency>
                <groupId>com.baomidou</groupId>
                <artifactId>mybatis-plus-spring-boot3-starter</artifactId>
                <version>3.5.5</version>
                <exclusions>
                    <exclusion>
                        <groupId>org.mybatis</groupId>
                        <artifactId>mybatis-spring</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis-spring</artifactId>
                <version>3.0.3</version>
            </dependency>

要不会报

Bean named 'ddlApplicationRunner' is expected to be of type 'org.springframework.boot.Runner' but was actually of type 'org.springframework.beans.factory.support.NullBean'

image.png

参考：Bean named‘ddlApplicationRunner‘is expected to be of type ‘org.springframework.boot.Runner‘_spring boot项目启动报错 bean named 'ddlapplicationrunner-CSDN博客
【Springboot 3.2.1 & mybatis-plus】升级版本遇到的问题_bean named 'ddlapplicationrunner' is expected to b-CSDN博客
SpringBoot3和mybatisplus整合出现的问题_bean named 'ddlapplicationrunner' is expected to b-CSDN博客
springboot3.2.1集成Mybatisplus启动报错（没事的时候就坑自己）_springboot 3.2.1整合mybatis-plus-CSDN博客
SpringBoot 3.2.1 启动报错 · Issue #5867 · baomidou/mybatis-plus · GitHub
【SpringBoot3集成Mybatis-plus】启动报错问题解决-CSDN博客