java Jasper 报告：文档根元素“jasperReport”，必须匹配 DOCTYPE 根“null”
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/13375805/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
提示：将鼠标放在中文语句上可以显示对应的英文。显示中英文
时间：2020-10-31 12:30:09 来源:igfitidea点击:
Jasper Report : Document root element "jasperReport", must match DOCTYPE root "null"
提问by Piraba
I have designed jasper report using iReportversion (4.7.1). Through iReport it works fine. When I called from java servlet, I get an error:
我使用iReport版本 (4.7.1)设计了 jasper 报告。通过 iReport 它工作正常。当我从 java servlet 调用时，出现错误：
Error : `Document root element "jasperReport", must match DOCTYPE root "null".`
net.sf.jasperreports.engine.JRException: Document root element "jasperReport",
must match DOCTYPE root "null".
at net.sf.jasperreports.engine.xml.JRXmlLoader.loadXML(JRXmlLoader.java:242)
at net.sf.jasperreports.engine.xml.JRXmlLoader.loadXML(JRXmlLoader.java:225)
at net.sf.jasperreports.engine.xml.JRXmlLoader.load(JRXmlLoader.java:213)
at net.sf.jasperreports.engine.xml.JRXmlLoader.load(JRXmlLoader.java:167)
at net.sf.jasperreports.engine.xml.JRXmlLoader.load(JRXmlLoader.java:151)
at com.crmreport.controller.ReportServlet.processRequest(ReportServlet.java:124)
at com.crmreport.controller.ReportServlet.doPost(ReportServlet.java:505)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:877)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:594)
at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:165)
at java.lang.Thread.run(Thread.java:619)
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(Err
orHandlerWrapper.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.rootEleme
ntSpecified(XMLDTDValidator.java:1621)
at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.handleSta
rtElement(XMLDTDValidator.java:1900)
at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.startElem
ent(XMLDTDValidator.java:764)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImp
l.scanStartElement(XMLDocumentFragmentScannerImpl.java:1357)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$Conten
tDriver.scanRootElementHook(XMLDocumentScannerImpl.java:1289)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImp
l$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:3084)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$Prolog
Driver.next(XMLDocumentScannerImpl.java:912)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(X
MLDocumentScannerImpl.java:645)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImp
l.scanDocument(XMLDocumentFragmentScannerImpl.java:508)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(X
ML11Configuration.java:807)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(X
ML11Configuration.java:737)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.
java:107)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Ab
stractSAXParser.java:1205)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.p
arse(SAXParserImpl.java:522)
at org.apache.commons.digester.Digester.parse(Digester.java:1745)
at net.sf.jasperreports.engine.xml.JRXmlLoader.loadXML(JRXmlLoader.java:
238)
This is my JRXML file:
这是我的 JRXML 文件：
<?xml version="1.0" encoding="UTF-8"?>
<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="BusinessUnitDetail"
pageWidth="595"
pageHeight="842"
columnWidth="535"
leftMargin="20"
rightMargin="20"
topMargin="20"
bottomMargin="20"
uuid="22e233b2-d42c-4a93-87c6-a1d23bd3f7ca">
<property name="ireport.zoom" value="1.0"/>
<property name="ireport.x" value="0"/>
<property name="ireport.y" value="0"/>
<style name="Title" forecolor="#FFFFFF" fontName="Times New Roman" fontSize="50" isBold="false" pdfFontName="Times-Bold"/>
<style name="SubTitle" forecolor="#CCCCCC" fontName="Times New Roman" fontSize="18" isBold="false" pdfFontName="Times-Roman"/>
<style name="Column header" forecolor="#666666" fontName="Times New Roman" fontSize="14" isBold="true" pdfFontName="Times-Roman"/>
<style name="Detail" mode="Transparent" fontName="Times New Roman" pdfFontName="Times-Roman"/>
<style name="Row" mode="Transparent" fontName="Times New Roman" pdfFontName="Times-Roman">
<conditionalStyle>
<conditionExpression><![CDATA[$V{REPORT_COUNT}%2 == 0]]></conditionExpression>
<style mode="Opaque" backcolor="#F0EFEF"/>
</conditionalStyle>
</style>
<parameter name="dateFrom" class="java.util.Date">
<property name="dateFrom" value="new java.util.Date()"/>
<defaultValueExpression><![CDATA[new java.util.Date()]]></defaultValueExpression>
</parameter>
<parameter name="dateTo" class="java.util.Date">
<property name="dateTo" value="new java.util.Date()"/>
<defaultValueExpression><![CDATA[new java.util.Date()]]></defaultValueExpression>
</parameter>
<queryString>
<![CDATA[SELECT
BusinessUnit AS BusinessUnit,
CallStart AS CallStart,
CallEnd AS CallEnd,
CallTakenBy AS CallTakenBy,
CalledDate AS CalledDate,
CallPersonName AS CallPersonName,
Duration AS Duration
FROM
crmcalldetail
WHERE CalledDate > $P{dateFrom} AND CalledDate < $P{dateTo}
ORDER BY BusinessUnit]]>
</queryString>
<field name="BusinessUnit" class="java.lang.String"/>
<field name="CallStart" class="java.sql.Time"/>
<field name="CallEnd" class="java.sql.Time"/>
<field name="CallTakenBy" class="java.lang.String"/>
<field name="CalledDate" class="java.sql.Date"/>
<field name="CallPersonName" class="java.lang.String"/>
<field name="Duration" class="java.lang.Integer"/>
<variable name="duration_sum" class="java.lang.Integer" resetType="Group" resetGroup="BusinessUnit" calculation="Sum">
<variableExpression><![CDATA[$F{Duration}]]></variableExpression>
</variable>
<variable name="duration_tot" class="java.lang.Integer" calculation="Sum">
<variableExpression><![CDATA[$F{Duration}]]></variableExpression>
</variable>
<group name="BusinessUnit">
<groupExpression><![CDATA[$F{BusinessUnit}]]></groupExpression>
<groupHeader>
<band height="37">
<frame>
<reportElement uuid="e53feaa2-4fce-4233-873c-4c5b1d87bd09" mode="Opaque" x="0" y="7" width="555" height="24" forecolor="#B89F7D" backcolor="#000000"/>
<textField isStretchWithOverflow="true">
<reportElement uuid="8a34951d-becf-4676-801f-1cbfd81518b9" style="SubTitle" isPrintRepeatedValues="false" x="2" y="0" width="479" height="24" forecolor="#FF6600"/>
<textElement>
<font isBold="false"/>
</textElement>
<textFieldExpression><![CDATA[$F{BusinessUnit}]]></textFieldExpression>
</textField>
</frame>
</band>
</groupHeader>
<groupFooter>
<band height="26">
<textField pattern="###0">
<reportElement uuid="6a2e9f4f-bc0c-4deb-a861-9d30221cc566" x="481" y="9" width="48" height="15" forecolor="#FF3300"/>
<textElement textAlignment="Right">
<font size="11" isBold="true" isUnderline="true"/>
</textElement>
<textFieldExpression><![CDATA[$V{duration_sum}]]></textFieldExpression>
</textField>
</band>
</groupFooter>
</group>
<background>
<band splitType="Stretch"/>
</background>
<title>
<band height="194" splitType="Stretch">
<image>
<reportElement uuid="97326b0b-4f59-45fa-bab1-82019da4a8f6" x="456" y="0" width="99" height="117"/>
<imageExpression><![CDATA["cherry.jpg"]]></imageExpression>
</image>
<frame>
<reportElement uuid="643a9f59-1f72-4def-a457-944bebb9111a" mode="Opaque" x="0" y="0" width="451" height="95" backcolor="#000000"/>
<staticText>
<reportElement uuid="c2fa629b-41e3-4ea6-ba69-458367963aac" style="Title" x="0" y="0" width="451" height="66"/>
<textElement>
<font isBold="false"/>
</textElement>
<text><![CDATA[Call Tracker Report]]></text>
</staticText>
<staticText>
<reportElement uuid="a01a3826-af92-4941-ab2b-41cb1da3f9a6" style="SubTitle" x="157" y="66" width="249" height="29"/>
<textElement>
<font size="22" isBold="false"/>
</textElement>
<text><![CDATA[X-ONT Software (Ltd) Ltd]]></text>
</staticText>
</frame>
<frame>
<reportElement uuid="3d131a89-bb0f-4d0a-8085-85ef01af5910" mode="Opaque" x="0" y="96" width="451" height="21" forecolor="#000000" backcolor="#CC0000"/>
<textField pattern="EEEEE dd MMMMM yyyy">
<reportElement uuid="580213d0-b1fc-4725-b311-c89e960a4ce0" x="303" y="1" width="144" height="20" forecolor="#FFFFFF"/>
<textElement textAlignment="Right">
<font size="12"/>
</textElement>
<textFieldExpression><![CDATA[new java.util.Date()]]></textFieldExpression>
</textField>
</frame>
<staticText>
<reportElement uuid="99c5e0a7-c15a-4072-b1ff-8b83a347f161" x="2" y="121" width="74" height="20"/>
<textElement>
<font isBold="true"/>
</textElement>
<text><![CDATA[Customer ]]></text>
</staticText>
<staticText>
<reportElement uuid="cfe1a411-8270-4b02-947c-a699ff86c385" x="205" y="121" width="56" height="20"/>
<textElement>
<font isBold="true"/>
</textElement>
<text><![CDATA[Called By]]></text>
</staticText>
<staticText>
<reportElement uuid="bc57e2ae-3f68-4376-9d87-97c2c984a679" x="363" y="121" width="100" height="20"/>
<textElement>
<font isBold="true"/>
</textElement>
<text><![CDATA[Called Taken By]]></text>
</staticText>
<staticText>
<reportElement uuid="ba3f773c-9145-4e37-9ffe-70dc2e1acefd" x="204" y="143" width="65" height="20"/>
<textElement>
<font isBold="true"/>
</textElement>
<text><![CDATA[Report Type]]></text>
</staticText>
<staticText>
<reportElement uuid="948a2d75-1716-414e-b2e9-4b3ab44382ca" x="2" y="143" width="74" height="20"/>
<textElement>
<font isBold="true"/>
</textElement>
<text><![CDATA[Group Type]]></text>
</staticText>
<staticText>
<reportElement uuid="1eb88a37-9aa5-4368-8e4d-fcf02b95a6bb" x="85" y="121" width="67" height="20"/>
<textElement/>
<text><![CDATA[ALL]]></text>
</staticText>
<staticText>
<reportElement uuid="b4d0efcf-fc10-4cd7-a946-786ee3d7865f" x="284" y="121" width="48" height="20"/>
<textElement/>
<text><![CDATA[ALL]]></text>
</staticText>
<staticText>
<reportElement uuid="b4d0efcf-fc10-4cd7-a946-786ee3d7865f" x="473" y="121" width="48" height="20"/>
<textElement/>
<text><![CDATA[ALL]]></text>
</staticText>
<staticText>
<reportElement uuid="37f5f2ec-f1c2-4837-b0bb-3b4dfde170d0" x="282" y="143" width="100" height="20"/>
<textElement/>
<text><![CDATA[Detail]]></text>
</staticText>
<staticText>
<reportElement uuid="2be6789f-c973-417f-b32a-44822d417a98" x="84" y="143" width="100" height="20"/>
<textElement/>
<text><![CDATA[CustomerCalled]]></text>
</staticText>
<staticText>
<reportElement uuid="f40bab96-7309-41d1-a874-f2b99a9f16bc" x="2" y="165" width="74" height="20"/>
<textElement>
<font isBold="true"/>
</textElement>
<text><![CDATA[Date From]]></text>
</staticText>
<staticText>
<reportElement uuid="692e0148-3beb-4c22-b193-36e37254421e" x="205" y="167" width="63" height="20"/>
<textElement>
<font isBold="true"/>
</textElement>
<text><![CDATA[Date To]]></text>
</staticText>
<textField pattern="yyyy-MM-dd">
<reportElement uuid="d0e85180-f225-4a6a-ae0d-7927da8212db" x="84" y="167" width="100" height="20"/>
<textElement/>
<textFieldExpression><![CDATA[$P{dateFrom}]]></textFieldExpression>
</textField>
<textField pattern="yyyy-MM-dd" isBlankWhenNull="true">
<reportElement uuid="43ea7f44-ebfd-459e-a9c1-dbbe89168f0b" x="282" y="167" width="83" height="20"/>
<textElement/>
<textFieldExpression><![CDATA[$P{dateTo}]]></textFieldExpression>
</textField>
</band>
</title>
<pageHeader>
<band splitType="Stretch"/>
</pageHeader>
<columnHeader>
<band height="29" splitType="Stretch">
<staticText>
<reportElement uuid="3284a455-7c75-40df-838b-34ec9fc5489e" style="Column header" x="297" y="5" width="76" height="18" forecolor="#000000"/>
<textElement>
<font isBold="true"/>
</textElement>
<text><![CDATA[Satrt]]></text>
</staticText>
<staticText>
<reportElement uuid="c41f01fd-3417-4cd2-a8d9-296069637903" style="Column header" x="384" y="5" width="67" height="18" forecolor="#000000"/>
<textElement>
<font isBold="true"/>
</textElement>
<text><![CDATA[End]]></text>
</staticText>
<staticText>
<reportElement uuid="95576a18-8fe1-4d57-bef4-c3361481475c" style="Column header" x="107" y="5" width="92" height="18" forecolor="#000000"/>
<textElement>
<font isBold="true"/>
</textElement>
<text><![CDATA[CallTakenBy]]></text>
</staticText>
<staticText>
<reportElement uuid="1ff784cc-a3ab-4f0e-931d-6924a48e5299" style="Column header" x="199" y="5" width="92" height="18" forecolor="#000000"/>
<textElement>
<font isBold="true"/>
</textElement>
<text><![CDATA[Date]]></text>
</staticText>
<staticText>
<reportElement uuid="4c7fd897-81e9-4711-99d1-de26c6f86a47" style="Column header" x="2" y="4" width="92" height="18" forecolor="#000000"/>
<textElement>
<font isBold="true"/>
</textElement>
<text><![CDATA[Called By]]></text>
</staticText>
<staticText>
<reportElement uuid="6033972d-b1d4-4154-9df2-24cba2a403dd" style="Column header" x="471" y="5" width="58" height="18" forecolor="#000000"/>
<textElement>
<font isBold="true"/>
</textElement>
<text><![CDATA[Duration]]></text>
</staticText>
</band>
</columnHeader>
<detail>
<band height="18" splitType="Stretch">
<frame>
<reportElement uuid="ccc5fd50-0293-441b-b783-e95672e038a1" style="Row" mode="Opaque" x="0" y="0" width="555" height="18"/>
<textField isStretchWithOverflow="true" pattern="h.mm a">
<reportElement uuid="a317f374-5796-43c4-99d6-10a3af7ee4db" style="Detail" positionType="Float" x="297" y="0" width="92" height="18"/>
<textElement>
<font size="14"/>
</textElement>
<textFieldExpression><![CDATA[$F{CallStart}]]></textFieldExpression>
</textField>
<textField isStretchWithOverflow="true">
<reportElement uuid="442d310e-4052-4ccb-96e0-636b268a55e7" style="Detail" positionType="Float" x="107" y="0" width="92" height="18"/>
<textElement>
<font size="14"/>
</textElement>
<textFieldExpression><![CDATA[$F{CallTakenBy}]]></textFieldExpression>
</textField>
<textField isStretchWithOverflow="true" pattern="dd-MMM-yy">
<reportElement uuid="74fca3b3-8be6-40b5-8556-eddf64295fd3" style="Detail" positionType="Float" x="199" y="0" width="92" height="18"/>
<textElement>
<font size="14"/>
</textElement>
<textFieldExpression><![CDATA[$F{CalledDate}]]></textFieldExpression>
</textField>
<textField isStretchWithOverflow="true">
<reportElement uuid="2dcf814d-af5b-4aa9-9fb3-a70948156bf3" style="Detail" positionType="Float" x="2" y="0" width="92" height="18"/>
<textElement>
<font size="14"/>
</textElement>
<textFieldExpression><![CDATA[$F{CallPersonName}]]></textFieldExpression>
</textField>
<textField isStretchWithOverflow="true" pattern="###0">
<reportElement uuid="b0db0027-f5f2-4126-a400-16e0b5a1d0ba" style="Detail" positionType="Float" x="481" y="0" width="48" height="18"/>
<textElement textAlignment="Right">
<font size="14"/>
</textElement>
<textFieldExpression><![CDATA[$F{Duration}]]></textFieldExpression>
</textField>
<textField isStretchWithOverflow="true" pattern="h.mm a">
<reportElement uuid="89479c74-1d4f-4e50-bc8c-3577a6081433" style="Detail" positionType="Float" x="389" y="0" width="92" height="18"/>
<textElement>
<font size="14"/>
</textElement>
<textFieldExpression><![CDATA[$F{CallEnd}]]></textFieldExpression>
</textField>
</frame>
</band>
</detail>
<columnFooter>
<band height="35" splitType="Stretch">
<line>
<reportElement uuid="4de509a0-2c1a-494e-80ba-26495de7e795" positionType="FixRelativeToBottom" x="0" y="3" width="555" height="1"/>
<graphicElement>
<pen lineWidth="0.5" lineColor="#999999"/>
</graphicElement>
</line>
<textField pattern="###0" isBlankWhenNull="true">
<reportElement uuid="daab26a1-72f8-48bb-aea6-3265520641c2" x="458" y="4" width="71" height="20" forecolor="#990000"/>
<textElement textAlignment="Right">
<font size="14" isBold="true" isUnderline="true"/>
</textElement>
<textFieldExpression><![CDATA[$V{duration_tot}]]></textFieldExpression>
</textField>
<staticText>
<reportElement uuid="aecf8666-74fc-4ff3-8a1b-3a4e548d5d69" x="307" y="4" width="149" height="20" forecolor="#990000"/>
<textElement>
<font size="12" isBold="true"/>
</textElement>
<text><![CDATA[Net Total Minutes]]></text>
</staticText>
</band>
</columnFooter>
<pageFooter>
<band height="25" splitType="Stretch">
<frame>
<reportElement uuid="57d220fb-781d-4991-a9e4-1b7006fea841" mode="Opaque" x="0" y="1" width="555" height="24" forecolor="#D0B48E" backcolor="#000000"/>
<textField evaluationTime="Report">
<reportElement uuid="59953dfc-6b53-4411-a003-74cd5d551432" style="Column header" x="513" y="0" width="40" height="20" forecolor="#FFFFFF"/>
<textElement verticalAlignment="Middle">
<font size="10" isBold="false"/>
</textElement>
<textFieldExpression><![CDATA[" " + $V{PAGE_NUMBER}]]></textFieldExpression>
</textField>
<textField>
<reportElement uuid="8a2577bd-ce1b-47e5-87bf-74e7627e89a3" style="Column header" x="433" y="0" width="80" height="20" forecolor="#FFFFFF"/>
<textElement textAlignment="Right" verticalAlignment="Middle">
<font size="10" isBold="false"/>
</textElement>
<textFieldExpression><![CDATA["Page "+$V{PAGE_NUMBER}+" of"]]></textFieldExpression>
</textField>
<textField pattern="EEEEE dd MMMMM yyyy">
<reportElement uuid="c36f2f3c-cae1-4e1a-889e-37c3a5862d5f" style="Column header" x="2" y="1" width="197" height="20" forecolor="#FFFFFF"/>
<textElement verticalAlignment="Middle">
<font size="10" isBold="false"/>
</textElement>
<textFieldExpression><![CDATA[new java.util.Date()]]></textFieldExpression>
</textField>
</frame>
</band>
</pageFooter>
<summary>
<band splitType="Stretch"/>
</summary>
</jasperReport>
This is what I run:
这是我运行的：
JasperReport jasperReport = null;
JasperDesign jasperDesign = null;
Map parameters = new HashMap();
parameters.put("dateFrom", dateFrom);
parameters.put("dateTo", dateTo);
String path = getServletContext().getRealPath("/WEB-INF/");
System.out.println("==Path==" + path);
String filePath = path+"\classes\com\crmreport\controller\BusinessUnitDetail.jrxml";
System.out.println("==filePath==" + filePath);
jasperDesign = JRXmlLoader.load(filePath);
jasperReport = JasperCompileManager.compileReport(jasperDesign);
byte[] byteStream = JasperRunManager.runReportToPdf(jasperReport, parameters, new JREmptyDataSource());
OutputStream outStream = response.getOutputStream();
response.setHeader("Content-Disposition","inline, filename=BusinessUnitDetail.pdf");
response.setContentType("application/pdf");
response.setContentLength(byteStream.length);
outStream.write(byteStream,0,byteStream.length);
What causes these errors? I googled it, it say error is on XML. But it worked fined using iReport.
导致这些错误的原因是什么？我用谷歌搜索，它说错误是在 XML 上。但它使用 iReport 被罚款。
回答by Guillaume
Assuming that the jrxml file has been added to your jar file, you should load it like this:
假设 jrxml 文件已经添加到你的 jar 文件中，你应该像这样加载它：
InputStream is = ReportServlet.class.getResourceAsStream(themeDesignName);
jasperDesign = JRXmlLoader.load(is);
回答by lgvalent
Earlier versions of JasperReport use DOCTYPE. Newer versions use XMLNS. When you opened your .JRXML, the iReport saved it using XMLNS and removed previous DOCTYPE tag, at the beginning of document. Update your Jasper JARS version, or save your JRXML as older version.
JasperReport 的早期版本使用 DOCTYPE。较新的版本使用 XMLNS。当您打开 .JRXML 时，iReport 使用 XMLNS 将其保存并删除了文档开头的先前 DOCTYPE 标记。更新您的 Jasper JARS 版本，或将您的 JRXML 保存为旧版本。
