可能重复：
Jasper Report : Document root element “jasperReport”, must match DOCTYPE root “null”
当我尝试运行 .jasper 文件时，我仍然无法创建**。pdf * report。
使用 iReport版本3.2.1 生成的 jrxml 文件：
<?xml version="1.0" encoding="UTF8"?>
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="report name" pageWidth="595" pageHeight="842" columnWidth="535" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20">
<field name="field1" class="java.lang.String"/>
<field name="field2" class="java.lang.String"/>
<field name="field3" class="java.lang.String"/>
<background>
<band/>
</background>
<title>
<band height="79">
<staticText>
<reportElement x="205" y="18" width="100" height="20"/>
<textElement/>
<text><![CDATA[Testing Jasper Report ]]></text>
</staticText>
</band>
</title>
<pageHeader>
<band height="35">
<textField>
<reportElement x="74" y="9" width="100" height="20"/>
<textElement/>
<textFieldExpression class="java.lang.String"><![CDATA[$F{field1}]]></textFieldExpression>
</textField>
</band>
</pageHeader>
<columnHeader>
<band height="126"/>
</columnHeader>
<detail>
<band/>
</detail>
<columnFooter>
<band/>
</columnFooter>
<pageFooter>
<band/>
</pageFooter>
<summary>
<band/>
</summary>
</jasperReport>
java代码是：
Map parameters = new HashMap();
parameters.put("field1","ClientName" );
JasperReport jasperReport = JasperCompileManager.compileReport("D://report1.jrxml");
JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport,parameters, new JREmptyDataSource());
JasperExportManager.exportReportToPdfFile(jasperPrint, "D://sample_report.pdf");
我得到的错误是：
Caused by: org.xml.sax.SAXParseException: Document root element "jasperReport", must match DOCTYPE root "null".
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:195)
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:131)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:384)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:318)
at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.rootElementSpecified(XMLDTDValidator.java:1621)
at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.handleStartElement(XMLDTDValidator.java:1900)
at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.startElement(XMLDTDValidator.java:764)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:1359)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$ContentDriver.scanRootElementHook(XMLDocumentScannerImpl.java:1316)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:3095)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:921)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:807)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:107)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)
at org.apache.commons.digester.Digester.parse(Digester.java:1572)
at net.sf.jasperreports.engine.xml.JRXmlLoader.loadXML(JRXmlLoader.java:238)