Pessoal, tem alguma classe ou jar para visualizar uma Danfe em um relaorio Ireport através de uma Servlet?

Gerar Danfe no Ireport apartir de um xml, e visualizar por uma servlet

O que eu quero mesmo é gerar uma Danfe pelo ireport a partir de um xml, e este relatorio ser chamado por uma servlet.

Estou usando estes exemplos, mas estou com certos erros:

http://www.javac.com.br/jc/posts/list/30/286.page

47 [main] ERROR digester.Digester  - Parse Error at line 2 column 388: Document root element "jasperReport", must match DOCTYPE root "null".
org.xml.sax.SAXParseException: Document root element "jasperReport", must match DOCTYPE root "null".
	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.dtd.XMLDTDValidator.rootElementSpecified(Unknown Source)
	at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.handleStartElement(Unknown Source)
	at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.startElement(Unknown Source)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$ContentDriver.scanRootElementHook(Unknown Source)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(Unknown Source)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
	at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
	at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
	at org.apache.commons.digester.Digester.parse(Digester.java:1647)
	at net.sf.jasperreports.engine.xml.JRXmlLoader.loadXML(JRXmlLoader.java:238)
	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 GerandoDanfe.getDanfe(GerandoDanfe.java:125)
	at GerandoDanfe.main(GerandoDanfe.java:34)
| ERROR: net.sf.jasperreports.engine.JRException: org.xml.sax.SAXParseException: Document root element "jasperReport", must match DOCTYPE root "null".
| ERROR: java.lang.NullPointerException

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