Result Maps collection already contains value for ***

今天在整合ssm框架是出現了錯誤  

Error creating bean with name 'userServiceImpl': 
Unsatisfied dependency expressed through field 'userMapper';
 nested exception is org.springframework.beans.factory.
 UnsatisfiedDependencyException: 
 Error creating bean with name 'userMapper' 
 defined in URL [jar:file:/D:/softwaredel/workspace/.metadata/
 .plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/
 manager-web/WEB-INF/lib/manager-dao-0.0.1-SNAPSHOT.jar!/
 com/atguigu/scw/manager/dao/UserMapper.class]: 
 Unsatisfied dependency expressed through bean 
 property 'sqlSessionFactory'; nested exception 
 is org.springframework.beans.factory.BeanCreationException: 
 Error creating bean with name 'sqlSessionFactoryBean' 
 defined in file [D:\softwaredel\workspace\.metadata\.
 plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\
 manager-web\WEB-INF\classes\spring-mybatis.xml]: 
 Invocation of init method failed; nested exception 
 is org.springframework.core.NestedIOException: 
 Failed to parse mapping resource: 'class path resource [mybatis/mapper/UserMapper.xml]'; 
 nested exception is org.apache.ibatis.builder.BuilderException: 
 Error parsing Mapper XML. Cause: java.lang.IllegalArgumentException:
 Result Maps collection already contains value for com.atguigu.scw.manager.dao.UserMapper.BaseResultMap

　　其中的關鍵錯誤信息就是：Result Maps collection already contains value for ***

 

在百度上查閱資料發現，是mybatis在逆向創建工程時，會自動生成sql配置映射文件，報這個錯誤是因為在生成是重復生成了，你沒運行一次，就會在映射的mapper.xml中重新生成字段值，所以在后邊的運行web工程時就會報錯，解決辦法就是將mapper.xml中的多余字段刪除，或者是將mapper.xml配置文件刪除，然后在重新生成，在重新生成的過程中pojo是不會重復生成的。