SAXTransformerFactory
Hello Specialists,
I've following problem (the same as described in: [; ...)
A java mapping for rendering PDF based on apache's FOP throws an exception:
javax.xml.transform.TransformerException: java.lang.ClassCastException:
class com.sap.aii.ib.server.mapping.execution.jaxpfactories.MappingTransformerFactory:sap.com/com.sap.xi.repository com.sap.engine.boot.loader.ResourceMultiParentClassLoader ... alive
incompatible with class javax.xml.transform.sax.SAXTransformerFactory:null at
com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:670) at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:300) at de.cceag.pi.mapping.fo.java.FOPHandler.transformPDF(FOPHandler.java:85)
For developing I use NWDS 7.1 and JDK 1.5.0_17 ... I also tried JDK 1.5.0_22. Finally, I tried using the rt.jar from SAPs jvm (.../sapjvm_5/jre/lib).
Here a code snippet:
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.sax.SAXResult;
import javax.xml.transform.stream.StreamSource;
import org.apache.fop.apps.FOPException;
import org.apache.fop.apps.FOUserAgent;
import org.apache.fop.apps.Fop;
import org.apache.fop.apps.FopFactory;
import org.apache.fop.apps.MimeConstants;
public ByteArrayOutputStream transformPDF(ByteArrayInputStream in, ByteArrayOutputStream out)
throws FOPException, TransformerException {
// Step 2: Set up output stream.
// Note: Using BufferedOutputStream for performance reasons (helpful with FileOutputStreams).
try {
// Step 3: Construct fop with desired output format
Fop fop = fopFactory.newFop(MimeConstants.MIME_PDF, this.foUserAgent, out);
// Step 4: Setup JAXP using identity transformer
TransformerFactory factory = TransformerFactory.newInstance();
// TransformerFactory factory = TransformerFactoryImpl.newInstance();
// SAXTransformerFactory factory = (SAXTransformerFactory) SAXTransformerFactory.newInstance();
// identity transformer
Transformer transformer = factory.newTransformer();
// Step 5: Setup input and output for XSLT transformation
// Setup input stream
Source src = new StreamSource(in);
// Resulting SAX events (the generated FO) must be piped through to FOP
Result res = new SAXResult(fop.getDefaultHandler());
// Step 6: Start XSLT transformation and FOP processing
transformer.transform(src, res);
We use PI 7.11 SP6. The 'Use SAP XML Toolkit' option in operation mapping is deactivated.
Any ideas?
Thanks and Regards
André
Hi André,
I'm facing same issue. Did you solve this issue ;if yes,please let me know how you did it.
Regards,
Alok
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Use JAXP+SAX.
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// SAX classes.
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import org.xml.sax.helpers.*;
//JAXP 1.1
import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.stream.*;
import javax.xml.transform.sax.*;
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atts.clear();
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hd.startElement("","","USER",atts);
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Cheers,
JavaImranSax.startDocument();
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</code><code>Sax.endElement("", "basic-metadata", "basic-metadata");</code>
<code class="jive-code jive-java">Sax.endElement("", "pdf", "pdf");
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* I HAVE CHANGED MY AS PER YOUR SUGGESTION, NOW SAME RESULT HAS COMING.
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JavaImran{code} -
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<?xml version="1.0" encoding="ISO-8859-1"?>
<DTR_XML/>
And I'm looking for output like this (I think - basically I have this dtr_xml.xsd located at the root web directory on http://maul.ddm.apm.bpm.eds.com and I want the generated XML file to reference that schema for validation when parsing):
<?xml version="1.0" encoding="ISO-8859-1"?>
<DTR_XML xmlns="http://maul.ddm.apm.bpm.eds.com"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maul.ddm.apm.bpm.eds.com dtr_xml.xsd"/>Yes, you've led me along the right track with the attributes stuff. Here's what I've got right now...
StreamResult streamResult = new StreamResult(out);
SAXTransformerFactory tf = (SAXTransformerFactory) SAXTransformerFactory.newInstance();
try {
TransformerHandler hd = tf.newTransformerHandler();
Transformer serializer = hd.getTransformer();
serializer.setOutputProperty(OutputKeys.ENCODING, "ISO-8859-1");
serializer.setOutputProperty(OutputKeys.INDENT, "yes");
hd.setResult(streamResult);
hd.startDocument();
AttributesImpl atts = new AttributesImpl();
atts.addAttribute("", "xmlns", "xmlns", "CDATA", "http://maul.ddm.apm.bpm.eds.com");
atts.addAttribute("", "xsi", "xmlns:xsi", "CDATA", "http://www.w3.org/2001/XMLSchema-instance");
atts.addAttribute("", "schemaLocation", "xsi:schemaLocation", "CDATA", "http://maul.ddm.apm.bpm.eds.com dtr_xml.xsd");
hd.startElement("", "DTR_XML", "DTR_XML", atts);
hd.endElement("", "DTR_XML", "DTR_XML");
hd.endDocument();
} catch (SAXException e) {
e.printStackTrace();
} catch (TransformerConfigurationException e) {
e.printStackTrace();
}This produces the output I wanted earlier...
As for the org.xml.sax.helpers.NamespaceSupport, I can't seem to find any documentation on using it anywhere, and the javadoc is cryptic to me. Maybe it's used internally in SAX for tracking namespaces or something like that.
Another interesting thing to me is that if I use the code you gave:
atts.addAttribute("http://www.w3.org/2001/XMLSchema-instance", "schemaLocation",
"xsi:schemaLocation", "CDATA", "http://maul.ddm.apm.bpm.eds.com dtr_xml.xsd");I don't see "http://www.w3.org/2001/XMLSchema-instance" anywhere in the output. Is SAX ignoring the namespace uri argument? It appears so. The javadoc states that the uri argument is "The Namespace URI, or the empty string if none is available or Namespace processing is not being performed." It would appear that Namespace processing is not being done... but I don't know how to turn it on. -
Awkward NullPointerException in Xalan transformations
L.S,
I'm having a serious problem with XSL transformations using Apache Xalan 2.6.0: a transformation works once, but multiple calls to the method will cause a null-pointer exception to occur within the TrAXFilter object taking care of the transformation.
The class responsible for transforming any XML messages in our system looks like this (class MessageWriter appearing at line 14 is a JAXB marshalling class we've developed; class FilterManager appearing at line 21 returns an array of 1 hard-coded XMLFilter object):
public class MessageBuilder {
private final static SAXParserFactory XML_PARSER = SAXParserFactory.newInstance();
public static String getXmlMessage(MessageSDO message) {
String xml = MessageWriter.doMarshal(message);
try {
SAXParser parser = XML_PARSER.newSAXParser();
XMLReader reader = XMLReaderFactory.createXMLReader();
InputSource srcInput = new InputSource(new StringReader(xml));
FilterManager ftrManager = (FilterManager) ConfigurationManager.
getInstance(ConfigurationManager.BOUNDARY).getBean(FilterManager.class);
XMLFilter[] filters = ftrManager.getOutputFilters(message);
if (filters.length > 0) {
for (int i=0;i<filters.length;i++) {
filters.setParent((i==0)? reader : filters[i-1]);
Serializer serializer = SerializerFactory.getSerializer(OutputPropertiesFactory.getDefaultMethodProperties("xml"));
ByteArrayOutputStream output = new ByteArrayOutputStream();
serializer.setOutputStream(output);
filters[filters.length-1].setContentHandler(serializer.asContentHandler());
filters[filters.length-1].parse(srcInput);
xml = output.toString();
} catch (Exception e) {
throw new RuntimeException(e);
return xml;
The test I've run (if 2nd block commented out test succeeds, otherwise it fails on that 2nd attempt):
public void testTransformedOutput() {
System.out.println("Transformed output test:\n\n");
MessageSDO msg = MockSDOFactory.getInstance().getMessageSDO();
String xmlMsg = MessageBuilder.getXmlMessage(msg);
/*System.out.println("Transformed output test, 2nd pass:\n\n");
MessageSDO msg2 = MockSDOFactory.getInstance().getMessageSDO();
String xmlMsg2 = MessageBuilder.getXmlMessage(msg2);*/
}The exception message:
java.lang.RuntimeException: java.lang.NullPointerException
at org.apache.crimson.parser.Parser2.parseInternal(Parser2.java:658)
at org.apache.crimson.parser.Parser2.parse(Parser2.java:334)
at org.apache.crimson.parser.XMLReaderImpl.parse(XMLReaderImpl.java:448)
at org.apache.xalan.transformer.TrAXFilter.parse(TrAXFilter.java:134)
at org.boundary.helper.MessageBuilder.getXmlMessage(MessageBuilder.java:36)
// Line 36 in MessageBuilder is:
// filters[filters.length-1].parse(srcInput);What I don't yet understand is how TrAXFilter manages to somehow not have a parent in the 2nd pass of the test, while it does in the 1st pass. I've tried a few things already, but so far haven't been able to find a solution.
Does anyone know of a bug like this? Or is it clear to someone what I'm doing completely wrong here? I'd appreciate any help you can offer.I've been able to solve this problem and since others might be interested, I thought I'd post the solution here as well.
It turns out that XMLFilter objects cannot be reused. This isn't documented very well, and undoubtedly doesn't come as a surprise to the more experienced XML specialists out there, but it's something you need to know. As a result, instead of using XMLFilter objects for repetetive transformations, you need to use an alternative, namely [url http://java.sun.com/j2se/1.4.2/docs/api/javax/xml/transform/Templates.html]Templates objects:
final SAXTransformerFactory FACTORY = (SAXTransformerFactory) TransformerFactory.newInstance();
File xslFile = new File("someStylesheet.xsl");
StreamSource src = new StreamSource(xslFile);
Templates template = FACTORY.newTemplates(src);
// Later on, you can repeatedly do this:
String xml = getSomeXMLDocument();
InputSource srcInput = new InputSource(new StringReader(xml));
XMLFilter filter = FACTORY.newXMLFilter(template); // Use cached template instead of parsing XSL file every time...
XMLReader reader = XMLReaderFactory.createXMLReader();
filter.setParent(reader);
Serializer serializer = SerializerFactory.getSerializer(OutputPropertiesFactory.getDefaultMethodProperties("xml"));
ByteArrayOutputStream output = new ByteArrayOutputStream();
serializer.setOutputStream(output);
filter.setContentHandler(serializer.asContentHandler());
filter.parse(srcInput);
String xml = output.toString(); -
Server to Rich Client sending XML over Http
I need to send XML data from a Servlet to a rich client over http.
Currently I am using HttpURLConnection and SaxTransformerFactory to do this.
Is it better to use SOAP or XML-RPC in this scenario?
Are there any good online tutorials comparing SOAP, XML-RPC and AXP-Java Net API?
What are the factors that I need to consider for choosing between these alternatives?
Please advice. Thanks in advance.XML-RPC and SOAP use XML as a way to communicate, but they are used to invoke certain function calls in an application independend manner, not to be used to send XML data. So I'd say it depends on:
a) what do you do with the XML data?
b) will you be expanding the application?
c) how difficult is it to rework the current implementation? -
I'm using JAXP 1.2
I have a custom sax parser (implements XMLReader) that reads csv files then sends SAX events to a stylesheet for translation. My problem is that Xalan requires a namespace-aware SAX parser. The SAXParserFactory has a method (setNamespaceAware()) which allows you to change this to "true", since the default is "false". Since I'm not using the SAXParserFactory to create my reader, I'm not sure how to set this using my custom parser. I have implemented the setFeature and getFeature by storing the values in a HashMap. See code below. I then execute the setFeature for my parser before I use the translator to set namespace to true.
csvReader.setFeature("http://xml.org/sax/features/namespace-prefixes",true);
csvReader.setFeature("http://xml.org/sax/features/namespace",true);
I'm not sure how to get Xalan to recognize these Features without creating a parser from the Factory. Any ideas?
/***************** CODE SAMPLE *****************/
private Map featureMap = new HashMap();
public boolean getFeature(String name)
throws SAXNotRecognizedException, SAXNotSupportedException {
Boolean featureValue = (Boolean) this.featureMap.get(name);
return (featureValue == null) ? false
: featureValue.booleanValue();
public void setFeature(String name, boolean value)
throws SAXNotRecognizedException, SAXNotSupportedException {
this.featureMap.put(name, new Boolean(value));
}Here's some code I have in production:SAXParserFactory spf = SAXParserFactory.newInstance();
XMLReader reader = spf.newSAXParser().getXMLReader();
reader.setContentHandler(handler);
reader.setProperty("http://xml.org/sax/properties/lexical-handler", handler);
reader.setFeature("http://xml.org/sax/features/namespaces", true);
reader.setFeature("http://xml.org/sax/features/namespace-prefixes", false);And here's the method that produces the "handler" object:private synchronized TransformerHandler getHandler(String xslFile) throws TransformerConfigurationException {
SAXTransformerFactory factory = (SAXTransformerFactory)TransformerFactory.newInstance();
Templates t = (Templates)templates.get(xslFile);
if (t == null) {
t = factory.newTemplates(new StreamSource(new File(getServletContext().getRealPath(xslFile))));
templates.put(xslFile, t);
return factory.newTransformerHandler(t);
}This works for me. The difference is that I am using Saxon instead of Xalan to do the transformation, and possibly that is a significant difference. -
Hi,
I have a problem with creating a SAX Parser on the PI 7.1 server. I get the following error in the log when I test the code in the repository and in the message flow.
com.sap.aii.ib.server.mapping.execution.jaxpfactories.MappingTransformerFactory:sap.com/com.sap.xi.repository[AT]com.sap.engine.boot.loader.ResourceMultiParentClassLoader[AT]42c4e790[AT]alive incompatible with class javax.xml.transform.sax.SAXTransformerFactory:null
[AT]= @
When I run the code on my local computer I dont get any problems. Does anybody know how I set up a SAX parser.
I currently use the following code.
public void execute(InputStream is, OutputStream out)
throws StreamTransformationException {
try{
//setup output handler
SAXTransformerFactory factory =
(SAXTransformerFactory) SAXTransformerFactory.newInstance();
th = factory.newTransformerHandler();
Result r = new StreamResult(out);
th.setResult(r);
// create parser
DefaultHandler handler = this;
SAXParserFactory parserFactory = SAXParserFactory.newInstance();
SAXParser saxParser = parserFactory.newSAXParser();
saxParser.parse(is, handler);
}catch(Exception e){
trace.addWarning(e.toString());
Best regards
Daniel Graversen.
[Figaf|http://figaf.com]It seems like will work on PI 7.31 systems.
com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl
factoryParser = new com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl(); -
Hello all
There's a vast amount of information on the java.sun.com site about parsing XML files:
* creating DOM trees in memory from an XML file
* setting up event handlers to be called when an XML file is parsed
* transforming XML files using XSL.
However, I can find very little information anywhere about writing XML files in the first place! I'm already aware of two ways to do this:
(1) create a DOM in memory and write this to a file. If the data is large, though, this isn't feasible.
(2) just output the XML elements directly to some file as text. This doesn't take account of the encoding, or special characters, and the document is not necessarily then syntactically valid.
Is there some API which I haven't yet come across that is designed specifically for writing XML data to files? If it's built in to Java 2, then goodness knows how I've missed it all this time; if it's third-party, I'd be grateful for any links.
Thanks for your help
Rich FearnI know pastes can be horrible, but this is a working example which I find useful: SAX XML output ;)
import java.io.*;
// SAX classes.
import org.xml.sax.*;
import org.xml.sax.helpers.*;
//JAXP 1.1
import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.stream.*;
import javax.xml.transform.sax.*;
//AlphabetXMLOut(file, alphabets);
class AlphabetXMLOut {
public void run(){
try{
FileOutputStream fos = new FileOutputStream("output.xml");
PrintWriter out = new PrintWriter(fos);
StreamResult streamResult = new StreamResult(out);
// PrintWriter from a Servlet
//PrintWriter out = response.getWriter();
//StreamResult streamResult = new StreamResult(out);
SAXTransformerFactory tf = (SAXTransformerFactory) SAXTransformerFactory.newInstance();
// SAX2.0 ContentHandler.
TransformerHandler hd = tf.newTransformerHandler();
Transformer serializer = hd.getTransformer();
serializer.setOutputProperty(OutputKeys.ENCODING,"ISO-8859-1");
serializer.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM,"users.dtd");
serializer.setOutputProperty(OutputKeys.INDENT,"yes");
hd.setResult(streamResult);
hd.startDocument();
AttributesImpl atts = new AttributesImpl();
// USERS tag.
hd.startElement("","","USERS",atts);
// USER tags.
String[] id = {"PWD122","MX787","A4Q45"};
String[] type = {"customer","manager","employee"};
String[] desc = {"Tim@Home","Jack&Moud","John D'oe"};
for (int i=0;i<id.length;i++){
atts.clear();
atts.addAttribute("","","ID","CDATA",id);
atts.addAttribute("","","TYPE","CDATA",type[i]);
hd.startElement("","","USER",atts);
hd.characters(desc[i].toCharArray(),0,desc[i].length());
hd.endElement("","","USER");
hd.endElement("","","USERS");
hd.endDocument();
fos.close();
}catch (IOException e){
System.err.println ("Unable to write to file");
System.exit(-1);
}catch (TransformerConfigurationException tce){
System.err.println("Error in: TransformerConfigurationException");
}catch (SAXException spe) {
// Error generated by the parser
System.err.println("Error in: (SAXException");
// Use the contained exception, if any
Exception x = spe;
if (spe.getException() != null)
x = spe.getException();
x.printStackTrace();
-Hope this helps -
I want to iterate over a database recordset and generate sax events to create a virtual xml document. But I'm struggling to see how the events are consumed.
What do I do with the events that are generated by the strart/end document and element handlers. How do I send to a file, or better still, pass the events onto some tool to output as html/xml pages?
Cheers again
-thanks 4earlier code @TrejkazAll the examples I have ever seen of SAX are like this:
You take an XML document and give it to a SAX parser. The SAX parser turns it into a stream of SAX events and calls your handler's startElement() etc. methods, which generally write to a file or something like that.
Your requirement is the reverse, namely you want to input from the "something like that", make a stream of SAX events, and have those turned into an XML document. I have never seen a decent example of this so I had to work it out for myself. I posted my solution in this forum several months ago but I can't find it now. So here it is again:SAXTransformerFactory factory = (SAXTransformerFactory)TransformerFactory.newInstance();
TransformerHandler handler = factory.newTransformerHandler();
// if you want to use XSL to transform what you produce then
// you need the version that takes a Templates argument.
handler.setResult(new StreamResult(response.getWriter()));
// in my case I send the resulting XML document to the servlet
// response, but you could send it somewhere else.
SAXParserFactory spf = SAXParserFactory.newInstance();
XMLReader reader = spf.newSAXParser().getXMLReader();
reader.setContentHandler(handler);
reader.setProperty("http://xml.org/sax/properties/lexical-handler", handler);
reader.setFeature("http://xml.org/sax/features/namespaces", true);
reader.setFeature("http://xml.org/sax/features/namespace-prefixes", false);
handler.startDocument();
startElement(handler, "Doc");
// I am producing an XML document whose root is a Doc element.
// Send more SAX events here.
endElement(handler, "Doc");
handler.endDocument();
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