IllegalArgumentException: Mapped Statements collection already contains value for ***Mapper.insert!s

目录

一：异常/错误

二：分析/排查

三：解决方法

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一：异常/错误

IllegalArgumentException: Mapped Statements collection already contains value for ***Mapper.insert!selectKey

[artifact:mvn] 2016-05-07 11:39:21,708 [ERROR] org.mybatis.spring.mapper.MapperFactoryBean - Error while adding the mapper 'interface com.sample.mappers.UserMapper' to configuration.
[artifact:mvn] java.lang.IllegalArgumentException: Mapped Statements collection already contains value for com.sample.mappers.UserMapper.getAllUsers
[artifact:mvn]  at org.apache.ibatis.session.Configuration$StrictMap.put(Configuration.java:802)
[artifact:mvn]  at org.apache.ibatis.session.Configuration$StrictMap.put(Configuration.java:774)
[artifact:mvn]  at org.apache.ibatis.session.Configuration.addMappedStatement(Configuration.java:598)
[artifact:mvn]  at org.apache.ibatis.builder.MapperBuilderAssistant.addMappedStatement(MapperBuilderAssistant.java:300)
[artifact:mvn]  at org.apache.ibatis.builder.annotation.MapperAnnotationBuilder.parseStatement(MapperAnnotationBuilder.java:313)
[artifact:mvn]  at org.apache.ibatis.builder.annotation.MapperAnnotationBuilder.parse(MapperAnnotationBuilder.java:128)
[artifact:mvn]  at org.apache.ibatis.binding.MapperRegistry.addMapper(MapperRegistry.java:72)
[artifact:mvn]  at org.apache.ibatis.session.Configuration.addMapper(Configuration.java:671)
[artifact:mvn]  at org.mybatis.spring.mapper.MapperFactoryBean.checkDaoConfig(MapperFactoryBean.java:81)
[artifact:mvn]  at org.springframework.dao.support.DaoSupport.afterPropertiesSet(DaoSupport.java:44)

二：分析/排查

出现这个错误的意思是：SQL标签中有 id 重复的标签，或者说有相同的方法名称

 

三：解决方法

解决方案：为不同的映射器语句使用不同的方法名称，即使方法签名不同。

1. 如果是自己写的mapper，建议手动排查是否有重复id的sql，例如： https://blog.csdn.net/kingscoming/article/details/78897459

2. 如果是通过mybatis逆向工程生成的代码，那肯定是不会有重复的id，那么问题很可能出现在同时有xml配置文件的mapper和java注解的mapper，删除一个就好了

 

ref：https://stackoverflow.com/questions/37085803/mybatis-mapped-statements-collection-already-contains-value-for