SpringBoot 3.2 整合 MyBatis 报错 Invalid value type for attribute ‘factoryBeanObjectType‘:String 的解决方案_java.lang.illegalargumentexception: invalid value

1. 导入相关依赖

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>3.0.2</version>
    </dependency>
    <dependency>
        <groupId>com.mysql</groupId>
        <artifactId>mysql-connector-j</artifactId>
        <scope>runtime</scope>
    </dependency>
</dependencies>

2. 项目启动报错

java.lang.IllegalArgumentException: Invalid value type for attribute 'factoryBeanObjectType': java.lang.String
    at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getTypeForFactoryBeanFromAttributes(FactoryBeanRegistrySupport.java:86) ~[spring-beans-6.1.6.jar:6.1.6]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getTypeForFactoryBean(AbstractAutowireCapableBeanFactory.java:837) ~[spring-beans-6.1.6.jar:6.1.6]
    at org.springframework.beans.factory.support.AbstractBeanFactory.isTypeMatch(AbstractBeanFactory.java:652) ~[spring-beans-6.1.6.jar:6.1.6]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doGetBeanNamesForType(DefaultListableBeanFactory.java:575) ~[spring-beans-6.1.6.jar:6.1.6]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:534) ~[spring-beans-6.1.6.jar:6.1.6]
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:138) ~[spring-context-6.1.6.jar:6.1.6]
    at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:788) ~[spring-context-6.1.6.jar:6.1.6]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:606) ~[spring-context-6.1.6.jar:6.1.6]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146) ~[spring-boot-3.2.5.jar:3.2.5]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754) ~[spring-boot-3.2.5.jar:3.2.5]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:456) ~[spring-boot-3.2.5.jar:3.2.5]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:334) ~[spring-boot-3.2.5.jar:3.2.5]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1354) ~[spring-boot-3.2.5.jar:3.2.5]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1343) ~[spring-boot-3.2.5.jar:3.2.5]
    at cn.xsu.boot.mybatis.SpringBoot01MybatisApplication.main(SpringBoot01MybatisApplication.java:11) ~[classes/:na]

3. 原因分析

项目中使用 mybatis-spring-boot-starter 是 3.0.2 版本，其中依赖的 mybatis-spring 的版本为 3.0.2 。

在 mybatis-spring 3.0.2 版本的 ClassPathMapperScanner#processBeanDefinitions 方法里将 beanClassName 赋值给 String 类型的变量,并将 beanClassName 赋值给 factoryBeanObjectType 。
                        
原文链接：https://blog.csdn.net/m0_46496775/article/details/138441352

4. 解决方案

mybatis-spring-boot-starter 的版本切换为 3.0.3 。

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>3.0.3</version>
    </dependency>
    <dependency>
        <groupId>com.mysql</groupId>
        <artifactId>mysql-connector-j</artifactId>
        <scope>runtime</scope>
    </dependency>
</dependencies>