Caused by: org.xml.sax.SAXParseException: 不允许有匹配 "[xX][mM][lL]" 的处理指令目标。

Caused by: org.xml.sax.SAXParseException: 不允许有匹配 "[xX][mM][lL]" 的处理指令目标。

Caused by: org.xml.sax.SAXParseException: 不允许有匹配 "[xX][mM][lL]" 的处理指令目标。
	at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:203) ~[na:1.8.0_121]
	at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:177) ~[na:1.8.0_121]
	at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:400) ~[na:1.8.0_121]
	at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:327) ~[na:1.8.0_121]
	at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(XMLScanner.java:1472) ~[na:1.8.0_121]
	at com.sun.org.apache.xerces.internal.impl.XMLScanner.scanPIData(XMLScanner.java:746) ~[na:1.8.0_121]
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanPIData(XMLDocumentFragmentScannerImpl.java:1014) ~[na:1.8.0_121]
	at com.sun.org.apache.xerces.internal.impl.XMLScanner.scanPI(XMLScanner.java:714) ~[na:1.8.0_121]
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:907) ~[na:1.8.0_121]
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:602) ~[na:1.8.0_121]
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:505) ~[na:1.8.0_121]
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:841) ~[na:1.8.0_121]
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:770) ~[na:1.8.0_121]
	at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141) ~[na:1.8.0_121]
	at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:243) ~[na:1.8.0_121]
	at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:339) ~[na:1.8.0_121]
	at org.apache.ibatis.parsing.XPathParser.createDocument(XPathParser.java:257) ~[mybatis-3.4.5.jar:3.4.5]
	... 53 common frames omitted

这是一个比较坑的错误提示。

发生的原因只是因为 mapper.xml 文件开头多了一个空行。

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