Problem with <xsl:apply-templates/> running FOP as Servlet
M.Weiss
I got a huge problem, rendering xml/xsl-documents to a pdf using fop in a
servlet. Perhaps, anybody could help me, as I`m near to give up ;-| Find the
XML-Datafile, the XSL-Template and the Servlet-Code below.
My problem is, that running the fop-commandline-tool (using FOP 0.20.1) the
conversion of those two files to a pdf runs very fine... No problem with
that. Using the same in a Servlet (in struts-paradigma), I got the following
error-stack on System.out:
using SAX parser org.apache.xerces.parsers.SAXParser
building formatting object tree
setting up fonts
[2]
java.lang.NoSuchMethodError
at
org.apache.xpath.axes.ChildIterator.nextNode(ChildIterator.java:140)
at
org.apache.xalan.templates.ElemForEach.transformSelectedNodes(ElemForEach.ja
va:428)
at
org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.jav
a:193)
at
org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Transform
erImpl.java:2154)
at
org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Transform
erImpl.java:2097)
at
org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java:
739)
at
org.apache.xalan.templates.ElemForEach.transformSelectedNodes(ElemForEach.ja
va:495)
at
org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.jav
a:193)
at
org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Transform
erImpl.java:2154)
at
org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Transform
erImpl.java:2097)
at
org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java:
739)
at
org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Transform
erImpl.java:2154)
at
org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Transform
erImpl.java:2097)
at
org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java:
739)
at
org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Transform
erImpl.java:2154)
at
org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Transform
erImpl.java:2097)
at
org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java:
739)
at
org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Transform
erImpl.java:2154)
at
org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Transform
erImpl.java:2097)
at
org.apache.xalan.transformer.TransformerImpl.applyTemplateToNode(Transformer
Impl.java:2029)
at
org.apache.xalan.transformer.TransformerImpl.transformNode(TransformerImpl.j
ava:1189)
at
org.apache.xalan.transformer.TransformerImpl.run(TransformerImpl.java:2894)
at java.lang.Thread.run(Thread.java:484)
When removing the <xsl:apply-templates/>-tag from the XSL-Template,
replacing it by e.g. "Test", the servlet runs quite fine and prints a PDF to
the browser.
The Action class uses a form class (instantiated as peForm) which got 2
properties (xml and xsl), so peForm.getXml() returns the file-name for the
XML-Datafile, peForm.getXsl() returns the file-name for the XSL-Template.
Can anyone help with that ?
Many thanks in advance and best regards,
Marcus
XML-DATA:
--------------
<?xml version="1.0"?>
<title>Chapter title</title>
XSL-TEMPLATE:
-------------------
<?xml version="1.0"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:fo="http://www.w3.org/1999/XSL/Format">
<xsl:template match="/">
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
<fo:layout-master-set>
<fo:simple-page-master master-name="page"
page-height="29.7cm"
page-width="21cm"
margin-top="1cm"
margin-bottom="2cm"
margin-left="2.5cm"
margin-right="2.5cm">
<fo:region-before extent="3cm"/>
<fo:region-body margin-top="3cm"/>
<fo:region-after extent="1.5cm"/>
</fo:simple-page-master>
</fo:layout-master-set>
<fo:page-sequence master-name="page" initial-page-number="2">
<fo:flow flow-name="xsl-region-body">
<xsl:apply-templates/>
</fo:flow>
</fo:page-sequence>
</fo:root>
</xsl:template>
<xsl:template match="title">
<fo:block text-align="center" space-after="8pt" space-before="16pt"
space-after.precedence="3">
<xsl:apply-templates/>
</fo:block>
</xsl:template>
</xsl:stylesheet>
JAVA-ACTIONCLASS:
--------------------------
package any.package.gui.action;
import org.apache.struts.action.ActionForward;
import java.io.*;
import java.util.Hashtable;
import java.util.Locale;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionError;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionServlet;
import org.apache.struts.util.MessageResources;
import any.package.gui.form.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
import org.xml.sax.SAXException;
import org.apache.fop.apps.Driver;
import org.apache.fop.apps.Version;
import org.apache.fop.apps.XSLTInputHandler;
public class PdfErstellenAction2 extends PrePostAction {
/** Default parser name. */
private static final String
DEFAULT_PARSER_NAME = "org.apache.xerces.parsers.SAXParser";
public PdfErstellenAction2() {
System.setProperty("org.xml.sax.driver", DEFAULT_PARSER_NAME);
}
public ActionForward executePre(ActionMapping mapping, AbstractForm
form,
HttpServletRequest request, HttpServletResponse response)
throws javax.servlet.ServletException, java.io.IOException {
return new ActionForward(mapping.getInput());
}
public ActionForward executePost(ActionMapping mapping, AbstractForm
form,
HttpServletRequest request, HttpServletResponse response)
throws javax.servlet.ServletException, java.io.IOException
{
PdfErstellenForm peForm = (PdfErstellenForm)form;
response.setContentType("application/pdf");
Driver driver = new Driver();
driver.setRenderer(Driver.RENDER_PDF);
XSLTInputHandler inputHandler = new XSLTInputHandler(new
File(peForm.getXml()), new File(peForm.getXsl()));
try
{
XMLReader parser = inputHandler.getParser();
ByteArrayOutputStream out = new ByteArrayOutputStream();
driver.setOutputStream(out);
driver.render(parser, inputHandler.getInputSource());
byte[] content = out.toByteArray();
response.setContentLength(content.length);
response.getOutputStream().write(content);
response.getOutputStream().flush();
}
catch (Exception e)
{
e.printStackTrace(System.out);
throw new ServletException(e);
}
return null;
}
static XMLReader createParser() throws ServletException {
String parserClassName = System.getProperty("org.xml.sax.parser");
if (parserClassName == null) {
parserClassName = "org.apache.xerces.parsers.SAXParser";
}
try {
return (XMLReader) Class.forName(parserClassName).newInstance();
} catch (Exception e) {
throw new ServletException(e);
}
}
}