当前使用版本(必填,否则不予处理)

com.baomidou mybatis-plus-boot-starter 3.4.3.1

该问题是如何引起的？(确定最新版也有问题再提!!!)

在 Mapper.xml 文件 定义的 标签中 定义 一对多映射 标签会导致项目启动报错,

将版本改为上一版本 <version>3.4.3</version> 可正常启动

重现步骤(如果有就写完整)

在 resultMap 标签中 定义 collection即可复现

报错信息

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [com/baomidou/mybatisplus/autoconfigure/MybatisPlusAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [D:\workspace\sys-manager\target\classes\mapper\SysUserMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [D:\workspace\sys-manager\target\classes\mapper\SysUserMapper.xml]'. Cause: java.lang.ClassCastException: com.baomidou.mybatisplus.core.MybatisConfiguration$StrictMap$Ambiguity cannot be cast to org.apache.ibatis.mapping.ResultMap
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:658) ~[spring-beans-5.3.8.jar:5.3.8]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:638) ~[spring-beans-5.3.8.jar:5.3.8]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1334) ~[spring-beans-5.3.8.jar:5.3.8]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177) ~[spring-beans-5.3.8.jar:5.3.8]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:564) ~[spring-beans-5.3.8.jar:5.3.8]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524) ~[spring-beans-5.3.8.jar:5.3.8]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.8.jar:5.3.8]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.8.jar:5.3.8]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.8.jar:5.3.8]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.8.jar:5.3.8]
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.8.jar:5.3.8]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1380) ~[spring-beans-5.3.8.jar:5.3.8]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1300) ~[spring-beans-5.3.8.jar:5.3.8]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireByType(AbstractAutowireCapableBeanFactory.java:1501) ~[spring-beans-5.3.8.jar:5.3.8]
    ... 108 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [D:\workspace\sys-manager\target\classes\mapper\SysUserMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [D:\workspace\sys-manager\target\classes\mapper\SysUserMapper.xml]'. Cause: java.lang.ClassCastException: com.baomidou.mybatisplus.core.MybatisConfiguration$StrictMap$Ambiguity cannot be cast to org.apache.ibatis.mapping.ResultMap
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.3.8.jar:5.3.8]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653) ~[spring-beans-5.3.8.jar:5.3.8]
    ... 121 common frames omitted
Caused by: org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [D:\workspace\sys-manager\target\classes\mapper\SysUserMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [D:\workspace\sys-manager\target\classes\mapper\SysUserMapper.xml]'. Cause: java.lang.ClassCastException: com.baomidou.mybatisplus.core.MybatisConfiguration$StrictMap$Ambiguity cannot be cast to org.apache.ibatis.mapping.ResultMap
    at com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean.buildSqlSessionFactory(MybatisSqlSessionFactoryBean.java:595) ~[mybatis-plus-extension-3.4.3.1.jar:3.4.3.1]
    at com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean.afterPropertiesSet(MybatisSqlSessionFactoryBean.java:431) ~[mybatis-plus-extension-3.4.3.1.jar:3.4.3.1]
    at com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean.getObject(MybatisSqlSessionFactoryBean.java:628) ~[mybatis-plus-extension-3.4.3.1.jar:3.4.3.1]
    at com.baomidou.mybatisplus.autoconfigure.MybatisPlusAutoConfiguration.sqlSessionFactory(MybatisPlusAutoConfiguration.java:219) ~[mybatis-plus-boot-starter-3.4.3.1.jar:3.4.3.1]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_131]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_131]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_131]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_131]
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.3.8.jar:5.3.8]
    ... 122 common frames omitted
Caused by: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [D:\workspace\sys-manager\target\classes\mapper\SysUserMapper.xml]'. Cause: java.lang.ClassCastException: com.baomidou.mybatisplus.core.MybatisConfiguration$StrictMap$Ambiguity cannot be cast to org.apache.ibatis.mapping.ResultMap
    at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:123) ~[mybatis-3.5.7.jar:3.5.7]
    at org.apache.ibatis.builder.xml.XMLMapperBuilder.parse(XMLMapperBuilder.java:95) ~[mybatis-3.5.7.jar:3.5.7]
    at com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean.buildSqlSessionFactory(MybatisSqlSessionFactoryBean.java:593) ~[mybatis-plus-extension-3.4.3.1.jar:3.4.3.1]
    ... 130 common frames omitted
Caused by: java.lang.ClassCastException: com.baomidou.mybatisplus.core.MybatisConfiguration$StrictMap$Ambiguity cannot be cast to org.apache.ibatis.mapping.ResultMap
    at com.baomidou.mybatisplus.core.MybatisConfiguration.checkGloballyForDiscriminatedNestedResultMaps(MybatisConfiguration.java:318) ~[mybatis-plus-core-3.4.3.1.jar:3.4.3.1]
    at com.baomidou.mybatisplus.core.MybatisConfiguration.addResultMap(MybatisConfiguration.java:222) ~[mybatis-plus-core-3.4.3.1.jar:3.4.3.1]
    at org.apache.ibatis.builder.MapperBuilderAssistant.addResultMap(MapperBuilderAssistant.java:209) ~[mybatis-3.5.7.jar:3.5.7]
    at org.apache.ibatis.builder.ResultMapResolver.resolve(ResultMapResolver.java:47) ~[mybatis-3.5.7.jar:3.5.7]
    at org.apache.ibatis.builder.xml.XMLMapperBuilder.resultMapElement(XMLMapperBuilder.java:289) ~[mybatis-3.5.7.jar:3.5.7]
    at org.apache.ibatis.builder.xml.XMLMapperBuilder.resultMapElement(XMLMapperBuilder.java:254) ~[mybatis-3.5.7.jar:3.5.7]
    at org.apache.ibatis.builder.xml.XMLMapperBuilder.resultMapElements(XMLMapperBuilder.java:246) ~[mybatis-3.5.7.jar:3.5.7]
    at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:119) ~[mybatis-3.5.7.jar:3.5.7]
    ... 132 common frames omitted

Comment From: xiaomizhg

为啥我回退了版本也不行 ？

Comment From: zhou7rui

还没有修复吗？

Comment From: yeziz2Z

还没有修复吗？

应该是还没，修复应该会发新版本的

Comment From: 12266601032

这个版本对短key特性支持有问题，配置关闭可临时解决问题 mybatis-plus.configuration.use-generated-short-key=false

Comment From: qmdx

版本 3.4.3.2 已发布，请升级验证修复该问题，有任何问题 issue 该问题关闭！