Hi Walter,
Walter Gamba wrote:
> Hello!
>
> SUMMARY: How to use a servlet as a generator in Cocoon, but allowing
> forms data to be passed via POST method (And NOT GET!!)
> ----------------------------------------------
>
>
> I can obtain correct XML output, provided I am happy with the raw XML
> and i don't translate it .. (and a side question could be.. how can I
> make the transformation from DOM to SAX efficiently, using some
> xml.apache.org library.. without serializing the DOM on a Stream and
> parsing it back?? THis brute force approach is the one I use now...
> but this is another question.. i suppose.. )
Cocoon provides helpers to deal with DOM2SAX and SAX2DOM :
org.apache.cocoon.xml.dom.DOMStreamer in your case. Look at Javadocs if
this matches your needs.
Concerning your NPE, I already had the same : my mistake was to have
sent two contentHandler.startDocument().
And I think you may do so here according to your code : the first is
explicitly written, and the second one may be implicit within the
parser.parse().
>
>
> THe Problem arises when I add a Trasformer:
>
> <map:match pattern="prova/test.html">
> <map:generate type="testgen" >
> <map:parameter name="servlet-class"
> value="TestServlet"/>
> </map:generate>
> <map:transform src="stylesheets/prova/TestServlet.xsl"/>
> <map:serialize type="html"/>
> </map:match>
>
> I've made the xsl such that it works fine with our testServlet and the
> requestGenerator:
> ...
> <map:generate type="request" />
> <map:transform src="stylesheets/prova/TestServlet.xsl"/>
>
> With the request generator it works fine and I get neatly formatted
> HTML, with our servlet, that apparently generates the same kind of
> XMLm it breaks down..
>
> Or, to be correct, it does not match any tags. The XSL is read because
> in the browser the basic HTML tags and title of the page (as specified
> inthe top level XSL "/" template-mathcing rule) are displayed, but any
> further XML tag is ignored, and moreover cocoon complains:
>
> FATAL_E (2002-03-13) 09:54.57:446 [core.xslt-processor]
> (/cocoon/prova/test.html) Thread-20/TraxErrorHandler: Error in
> TraxTransformer: javax.xml.transform.TransformerException:
> java.lang.NullPointerException
> javax.xml.transform.TransformerException: java.lang.NullPointerException
> at
>
>org.apache.xalan.transformer.TransformerImpl.transformNode(TransformerImpl.java:1230)
>
> at
> org.apache.xalan.transformer.TransformerImpl.run(TransformerImpl.java:3139)
>
> at java.lang.Thread.run(Thread.java:484)
> ---------
> java.lang.NullPointerException
> at
>
>org.apache.xalan.transformer.TransformerImpl.applyTemplateToNode(TransformerImpl.java:1887)
>
>
> at
>
>org.apache.xalan.transformer.TransformerImpl.transformNode(TransformerImpl.java:1175)
>
> at
> org.apache.xalan.transformer.TransformerImpl.run(TransformerImpl.java:3139)
>
> at java.lang.Thread.run(Thread.java:484)
>
>
> THat's it. I enclose the bit of code of the Generator that translated
> a DOM to SAX events.. perhaps there is something here that works with
> raw XML but breaks down when SAX events are sent down the pipeline..
>
> Any help would be appreciated!
> Thanx
>
> Walter Gamba
>
> -----------------------
> public synchronized void outputXML(String NSURI, Document doc)
> {
> try{
> super.contentHandler.startDocument();
> //super.contentHandler.startPrefixMapping("",NSURI);
> transformDOM2SAX(super.contentHandler,doc);
> //super.contentHandler.endPrefixMapping("");
> super.contentHandler.endDocument();
> }catch(SAXException s){
> log.error("Errore SAX!:"+s);
> }
> }
>
> private static /* synchronized */ void transformDOM2SAX(ContentHandler
> cHandler, Document doc) {
> //brute force way
> try {
> //1) open stream
> CharArrayWriter writer = new CharArrayWriter();
>
> printDocument(writer, doc);
>
> //2) create SAX parserthat can read from stream
> SAXParserFactory spf = SAXParserFactory.newInstance();
> SAXParser parser = spf.newSAXParser();
>
> //3) build a reader and InputSource
> Reader reader = new CharArrayReader(writer.toCharArray());
> InputSource source = new InputSource(reader);
>
> log.debug("TestGenerator::transformDOM2SAX -> parse");
> ServletDefaultHandler sdh=new ServletDefaultHandler(cHandler);
> try{
> parser.parse(source, sdh);
> }
> catch(Exception npe){
> log.error("Errore in PARSE:"+npe,npe);
> }
> //writer.close();
> log.debug("TestGenerator::transformDOM2SAX -> end parse");
>
> }
> catch (IOException ioe) {
> log.error("Errore in creazione reader/writer oppure in
> source:" + ioe, ioe);
> }
> catch (ParserConfigurationException pfe) {
> log.error("Errore parseconfig!:" + pfe, pfe);
> }
> catch (SAXException sax) {
> log.error("Errore sax!:" + sax, sax);
> }
>
>
> Walter Gamba
> [EMAIL PROTECTED]
> E-Gramma srl
> via Palazzo di Citta' 8 - 10122 TORINO
> tel 011-5136583 fax 011-5136582
> www.e-gramma.it
>
>
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