XML TO PDF printing

Question

Hi,
I managed to create a pdf File, from a XML document, using XSLT and XSL-FO.
I'd like now to print this pdf File from my Java application. Is there a simple way of doing this ?
Thank you in advance for any help.
import java.io.*;
import javax.xml.transform.*;
import javax.xml.transform.stream.*;
import javax.xml.transform.sax.*;
import org.apache.avalon.framework.*;
import org.apache.avalon.framework.logger.*;
import org.apache.fop.apps.*;
* This class converts an XML file to PDF using JAXP (XSLT) and FOP (XSL-FO).
* @author
public class XmlToPdf {
private static final String BASE_DIR = "./test/";
private static final String FILE = "test";
* Converts an XML file to a PDF file using JAXP and FOP.
* @param xmlFile The XML file
* @param xslFile The XSLT stylesheet file
* @param pdfFile The output PDF file
* @throws IOException In case of an I/O problem
* @throws FOPException In case of a FOP problem
* @throws TransformerException In case of a XSL transformation problem
public void convertXML2PDF(File xmlFile, File xsltFile, File pdfFile)
throws IOException, FOPException, TransformerException {
//Construct driver
Driver driver = new Driver();
//Setup logger
Logger logger = new ConsoleLogger(ConsoleLogger.LEVEL_INFO);
driver.setLogger(logger);
//Setup Renderer (output format)
driver.setRenderer(Driver.RENDER_PDF);
//Setup output
OutputStream out = new FileOutputStream(pdfFile);
out = new BufferedOutputStream(out);
try {
driver.setOutputStream(out);
//Setup XSLT
TransformerFactory myFactory = TransformerFactory.newInstance();
Transformer myTransformer = myFactory.newTransformer(new StreamSource(xsltFile));
//Setup input for XSLT transformation
Source src = new StreamSource(xmlFile);
//The generated FO (resulting SAX events) must be sent to FOP
Result res = new SAXResult(driver.getContentHandler());
//Start XSLT transformation and FOP processing
myTransformer.transform(src, res);
} finally {
out.flush();
out.close();
* Main method.
* @param args command-line arguments
public static void main(String[] args) {
try {
System.out.println("Starting XML TO PDF Transformation...\n");
//Base Directory...
File baseDir = new File(BASE_DIR);
//Input and output files...
File xmlFile = new File(baseDir, FILE+".xml");
File xsltFile = new File(baseDir, FILE+".xsl");
File pdfFile = new File(baseDir, FILE+".pdf");
System.out.println("Input: XML (" + xmlFile + ")");
System.out.println("XSL Stylesheet: " + xsltFile);
System.out.println("Output: PDF (" + pdfFile + ")");
System.out.println();
System.out.println("Transforming...");
XmlToPdf app = new XmlToPdf();
// Do the transformation...
app.convertXML2PDF(xmlFile, xsltFile, pdfFile);
System.out.println();
System.out.println("The pdf was created succesfully !\n");
} catch (Exception e) {
System.err.println(e.getMessage());
e.printStackTrace();
System.exit(-1);

Answer 1

hi everybody
i use the code of the class XmlToPdf but i have a problem when i run it
[ERROR] Unsupported element encountered: html (Namespace: default). Source context: unavailable
[ERROR] Expected XSL-FO (root, page-sequence, etc.), SVG (svg, rect, etc.) or elements from another supported language.
java.lang.NullPointerException
javax.xml.transform.TransformerException: java.lang.NullPointerException
     at org.apache.xalan.transformer.TransformerImpl.transformNode(TransformerImpl.java:1226)
     at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:638)
     at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1088)
     at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1066)
     at com.clear2pay.toolbox.reports.fop.XmlToPdf .convertXML2PDF(XmlToPdf java:526)
     at com.clear2pay.toolbox.reports.fop.XmlToPdf .main(XmlToPdf .java:557)
i don't see where is the problem.
this is the XML File that i use
<?xml version="1.0" encoding="UTF-8"?>
<changelog>
     <entry>
          <date>2002-12-09</date>
          <time>14:21</time>
          <author><![CDATA[jmc]]></author>
          <file>
               <name>develop/web/vds-rel1/c/su_rgd0_c.jsp</name>
               <revision>1.9</revision>
               <prevrevision>1.4</prevrevision>
          </file>
          <msg><![CDATA[moved cancel button into seperate for so it doesn't invoke js validation]]></msg>
     </entry>
     <entry>
          <date>2002-12-09</date>
          <time>13:41</time>
          <author><![CDATA[jmc]]></author>
          <file>
               <name>develop/web/vds-rel1/c/su_pm0_c.jsp</name>
               <revision>1.18</revision>
               <prevrevision>1.124</prevrevision>
          </file>
          <msg><![CDATA[moved << and >> to the correct column]]></msg>
     </entry>     
</changelog>
and this is the XSL that i use
<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet
xmlns:xsl='http://www.w3.org/1999/XSL/Transform'
version='1.0'>
<xsl:param name="title"/>
<xsl:param name="module"/>
<xsl:param name="cvsweb"/>
<xsl:output method="html" indent="yes" encoding="US-ASCII"
doctype-public="-//W3C//DTD HTML 4.01//EN"
doctype-system="http://www.w3.org/TR/html401/strict.dtd"/>
<xsl:template match="*">
<xsl:copy>
<xsl:copy-of select="attribute::*[. != '']"/>
<xsl:apply-templates/>
</xsl:copy>
</xsl:template>
<xsl:template match="changelog">
<html>
<head>
<title><xsl:value-of select="$title"/></title>
<style type="text/css">
body, p {
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 80%;
color: #000000;
background-color: #ffffff;
tr, td {
font-family: Verdana, Arial, Helvetica, sans-serif;
background: #eeeee0;
td {
padding-left: 20px;
.dateAndAuthor {
font-family: Verdana, Arial, Helvetica, sans-serif;
font-weight: bold;
text-align: left;
background: #a6caf0;
padding-left: 3px;
a {
color: #000000;
pre {
font-weight: bold;
</style>
</head>
<body>
<h1>
<a name="top"><xsl:value-of select="$title"/></a>
</h1>
<p style="text-align: right">Designed for use with Ant.</p>
<hr/>
<table border="0" width="100%" cellspacing="1">
<xsl:apply-templates select=".//entry">
<xsl:sort select="date" data-type="text" order="descending"/>
<xsl:sort select="time" data-type="text" order="descending"/>
</xsl:apply-templates>
</table>
</body>
</html>
</xsl:template>
<xsl:template match="entry">
<tr>
<td class="dateAndAuthor">
<xsl:value-of select="date"/><xsl:text> </xsl:text><xsl:value-of select="time"/><xsl:text> </xsl:text><xsl:value-of select="author"/>
</td>
</tr>
<tr>
<td>
<pre>
<xsl:apply-templates select="msg"/></pre>
<ul>
<xsl:apply-templates select="file"/>
</ul>
</td>
</tr>
</xsl:template>
<xsl:template match="date">
<i><xsl:value-of select="."/></i>
</xsl:template>
<xsl:template match="time">
<i><xsl:value-of select="."/></i>
</xsl:template>
<xsl:template match="author">
<i>
<a>
<xsl:attribute name="href">mailto:<xsl:value-of select="."/></xsl:attribute>
<xsl:value-of select="."/></a>
</i>
</xsl:template>
<xsl:template match="file">
<li>
<a>
<xsl:choose>
<xsl:when test="string-length(prevrevision) = 0 ">
<xsl:attribute name="href"><xsl:value-of select="$cvsweb"/><xsl:value-of select="$module" />/<xsl:value-of select="name" />?rev=<xsl:value-of select="revision" />&content-type=text/x-cvsweb-markup</xsl:attribute>
</xsl:when>
<xsl:otherwise>
<xsl:attribute name="href"><xsl:value-of select="$cvsweb"/><xsl:value-of select="$module" />/<xsl:value-of select="name" />?r1=<xsl:value-of select="revision" />&r2=<xsl:value-of select="prevrevision"/></xsl:attribute>
</xsl:otherwise>
</xsl:choose>
<xsl:value-of select="name" /> (<xsl:value-of select="revision"/>)</a>
</li>
</xsl:template>
<!-- Any elements within a msg are processed,
so that we can preserve HTML tags. -->
<xsl:template match="msg">
<xsl:apply-templates/>
</xsl:template>
</xsl:stylesheet>
Thank you in advance for any help.