1. 现象
最近写MyBatis的ResultMap是不小心遇到了如下错误，看着还怪吓人的。
Caused by: org.xml.sax.SAXParseException; lineNumber: 35; columnNumber: 17; 元素类型为 "resultMap" 的内容必须匹配 "(constructor?,id*,result*,association*,collection*,discriminator?)"。 at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source) at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source) at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.handleEndElement(Unknown Source) at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.endElement(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(Unknown Source) at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(Unknown Source) at org.apache.ibatis.parsing.XPathParser.createDocument(XPathParser.java:254) ... 46 more
2. 原因
由于英语水平比较坑，一时没反应过来，后来发现是resultMap元素中，<id>、<result>、<assoation>都是有顺序的，我不小心把一个assocation元素放在了result中间导致这一个异常。
另外提下，MyBatis中xml配置好像都是有顺序的，看到类似元素类型XXX的内容必须匹配(XXX)，应该都是类似的错误。
![单模和多模光纤电缆的区别 原文出自[易百教程] 转载请保留原文链接: https://www.yiibai.com/geek/330968](https://ucc.alicdn.com/pic/developer-ecology/g5tp3lgf24cqc_1a20a55876d944d39024ca87c392d051.png?x-oss-process=image/resize,h_160,m_lfit)
