mybatis generator自动生成代码报The error occurred while processing mapper_resultMap[BaseResultMap]错误的解决方法...

今天在用mybatis自动生成代码之后遇到了一个错误:

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org.apache.ibatis.exceptions.PersistenceException :
### Error building SqlSession.
### The error may exist in com/erp/webservice/mapper/UsersMapper.xml
### The error occurred while processing mapper_resultMap[BaseResultMap]
### Cause: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: java.lang.RuntimeException: Error parsing Mapper XML. Cause: java.lang.IllegalArgumentException : Result Maps collection already contains value for com.erp.webservice.inter.UsersMapper.BaseResultMap
      at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java: 23 )
      at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java: 51 )
      at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java: 35 )
      at com.erp.webservice.test.Test.( Test.java: 22 )
Caused by: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: java.lang.RuntimeException: Error parsing Mapper XML. Cause: java.lang.IllegalArgumentException : Result Maps collection already contains value for com.erp.webservice.inter.UsersMapper.BaseResultMap
      at org.apache.ibatis.builder.xml.XMLConfigBuilder.parseConfiguration(XMLConfigBuilder.java: 107 )
      at org.apache.ibatis.builder.xml.XMLConfigBuilder.parse(XMLConfigBuilder.java: 89 )
      at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java: 49 )
      ... 2 more
Caused by: java.lang.RuntimeException: Error parsing Mapper XML. Cause: java.lang.IllegalArgumentException : Result Maps collection already contains value for com.erp.webservice.inter.UsersMapper.BaseResultMap
      at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java: 113 )
      at org.apache.ibatis.builder.xml.XMLMapperBuilder.parse(XMLMapperBuilder.java: 88 )
      at org.apache.ibatis.builder.xml.XMLConfigBuilder.mapperElement(XMLConfigBuilder.java: 325 )
      at org.apache.ibatis.builder.xml.XMLConfigBuilder.parseConfiguration(XMLConfigBuilder.java: 105 )
      ... 4 more
Caused by: java.lang.IllegalArgumentException: Result Maps collection already contains value for com.erp.webservice.inter.UsersMapper.BaseResultMap
      at org.apache.ibatis.session.Configuration$StrictMap.put(Configuration.java: 710 )
      at org.apache.ibatis.session.Configuration$StrictMap.put(Configuration.java: 682 )
      at org.apache.ibatis.session.Configuration.addResultMap(Configuration.java: 473 )
      at org.apache.ibatis.builder.MapperBuilderAssistant.addResultMap(MapperBuilderAssistant.java: 204 )
      at org.apache.ibatis.builder.ResultMapResolver.resolve(ResultMapResolver.java: 44 )
      at org.apache.ibatis.builder.xml.XMLMapperBuilder.resultMapElement(XMLMapperBuilder.java: 277 )
      at org.apache.ibatis.builder.xml.XMLMapperBuilder.resultMapElement(XMLMapperBuilder.java: 244 )
      at org.apache.ibatis.builder.xml.XMLMapperBuilder.resultMapElements(XMLMapperBuilder.java: 236 )
      at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java: 109 )
      ... 7 more
Exception in thread "main" java.lang.NullPointerException
      at com.erp.webservice.test.Test.main( Test.java: 29 )

后来发现是我运行了多次自动生成代码的程序,导致了com/erp/webservice/mapper/UsersMapper.xml的内容多出来很多,原来自动生成代码的时候生成的XML代码不是覆盖原来的,而是附加的XML的尾部的。

第一次运行自动生成代码程序:

 

 

 

 

 

 

第二次运行自动生成代码程序:

 

 

 

 

 

 

看看,XML文件明显大了很多,只要删掉原来的XML然后重新运行自动生成代码的程序即可。

或者去工作空间吧生成的东西都删除一边重新生成

转载于:https://www.cnblogs.com/wxldlxt/p/11389750.html

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