逆向工程xml报错_caused by: javax.xml.transform.transformerexceptio-优快云博客

本文解决了一个在使用MyBatis时遇到的异常：ResultMap集合中已存在相同名称的ResultMap，此问题源于逆向工程生成mapper时未清理旧的mapper.xml文件，导致BaseResultMap重复。

异常：java.lang.IllegalArgumentException: Result Maps collection already contains …

贴一个困扰了一下午的异常，异常信息如下：

十一月 24, 2017 9:26:07 上午 org.apache.catalina.core.ApplicationContext log
严重: StandardWrapper.Throwable
org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘sqlSessionFactory’ defined in file [F:\JavaWeb.metadata.plugins\org.eclipse.wst.server.core\tmp1\wtpwebapps\jh_qisf\WEB-INF\classes\spring\spring-dao.xml]: Invocation of init method failed; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: ‘file [F:\JavaWeb.metadata.plugins\org.eclipse.wst.server.core\tmp1\wtpwebapps\jh_qisf\WEB-INF\classes\mapper\DepartmentMapper.xml]’; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: java.lang.IllegalArgumentException: Result Maps collection already contains value for cn.jinhai.qisf.dao.DepartmentMapper.BaseResultMap
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1574)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
at org.springframework.beans.factory.support.AbstractBeanFactoryAbstractConnectionHandler.process(AbstractProtocol.java:637)
at org.apache.tomcat.util.net.JIoEndpoint $S o c k e t P r o c e s s o r . r u n (J I o E n d p o i n t . j a v a : 316) a t j a v a . u t i l . c o n c u r r e n t . T h r e a d P o o l E x e c u t o r . r u n W o r k e r (T h r e a d P o o l E x e c u t o r . j a v a : 1149) a t j a v a . u t i l . c o n c u r r e n t . T h r e a d P o o l E x e c u t o r$ Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread $KaTeX parse error: Undefined control sequence: \JavaWeb at position 182: …urce: 'file [F:\̲J̲a̲v̲a̲W̲e̲b̲\.metadata\.plu…$ StrictMap.put(Configuration.java:802)
at org.apache.ibatis.session.Configuration$StrictMap.put(Configuration.java:774)
at org.apache.ibatis.session.Configuration.addResultMap(Configuration.java:556)
at org.apache.ibatis.builder.MapperBuilderAssistant.addResultMap(MapperBuilderAssistant.java:217)
at org.apache.ibatis.builder.ResultMapResolver.resolve(ResultMapResolver.java:47)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.resultMapElement(XMLMapperBuilder.java:285)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.resultMapElement(XMLMapperBuilder.java:252)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.resultMapElements(XMLMapperBuilder.java:244)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:116)
… 39 more

十一月 24, 2017 9:26:07 上午 org.apache.catalina.core.StandardWrapperValve invoke
严重: Allocate exception for servlet mvc-dispatcher
java.lang.IllegalArgumentException: Result Maps collection already contains value for cn.jinhai.qisf.dao.DepartmentMapper.BaseResultMap
at org.apache.ibatis.session.Configuration $S t r i c t M a p . p u t (C o n f i g u r a t i o n . j a v a : 802) a t o r g . a p a c h e . i b a t i s . s e s s i o n . C o n f i g u r a t i o n$ StrictMap.put(Configuration.java:774)
at org.apache.ibatis.session.Configuration.addResultMap(Configuration.java:556)
at org.apache.ibatis.builder.MapperBuilderAssistant.addResultMap(MapperBuilderAssistant.java:217)
at org.apache.ibatis.builder.ResultMapResolver.resolve(ResultMapResolver.java:47)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.resultMapElement(XMLMapperBuilder.java:285)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.resultMapElement(XMLMapperBuilder.java:252)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.resultMapElements(XMLMapperBuilder.java:244)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:116)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.parse(XMLMapperBuilder.java:92)
at org.mybatis.spring.SqlSessionFactoryBean.buildSqlSessionFactory(SqlSessionFactoryBean.java:466)
at org.mybatis.spring.SqlSessionFactoryBean.afterPropertiesSet(SqlSessionFactoryBean.java:343)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1633)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1570)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
at org.springframework.beans.factory.support.AbstractBeanFactoryAbstractConnectionHandler.process(AbstractProtocol.java:637)
at org.apache.tomcat.util.net.JIoEndpoint $S o c k e t P r o c e s s o r . r u n (J I o E n d p o i n t . j a v a : 316) a t j a v a . u t i l . c o n c u r r e n t . T h r e a d P o o l E x e c u t o r . r u n W o r k e r (T h r e a d P o o l E x e c u t o r . j a v a : 1149) a t j a v a . u t i l . c o n c u r r e n t . T h r e a d P o o l E x e c u t o r$ Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)

该异常大概的展现方式如下：
java.lang.IllegalArgumentException: Result Maps collection already contains value for xxx.xxx.xxx.BaseResultMap

意思大概是已经存在这个结果集，花费了好多时间找这个问题的原因，最后用eclipse的全局搜索发现，确实在同一个mapper文件下存在重复的BaseResultMap。
这个问题的产生原因是：使用mybatis逆向工程多次生成mapper时，未将之前生成的mapper.xml删除，导致其在原有的xml里追加内容。最终导致BaseResultMap重复。
解决方法：删除已生成的mapper.xml，重新生成。