Ok,
I'm doing this:
Transformer transformer = tFactory.newTransformer( new StreamSource( xsl_url ) );
transformer.transform( new DOMSource( source ), new SAXResult(
driver.getContentHandler() ));
and I'm getting javax.xml.transform.TransformerException:
java.lang.NullPointerException.
this is last point of execution in the stack trace:
at org.apache.fop.fo.pagination.PageSequence.<init>(PageSequence.java:144)
Do you, or anyone know why this would be? Also, once this runs, do I call
driver.run()?
On Fri, Mar 22, 2002 at 05:59:26PM +0100, Jeremias Maerki wrote:
> > I was just looking at the FOP API JavaDocs. Can I use getContentHanlder from the
>Driver object, send that
> > into the transformer wrapped in a SAXResults object? Will this populate FOP with
>the required data to do
> > the XSL:FO transform?
>
> You got it!!!!! That's just what I was about to suggest.
>
> > On Fri, Mar 22, 2002 at 11:22:12AM -0500, David B. Bitton wrote:
> > > 1000/N
> > > Status: O
> > > X-Status:
> > > X-Keywords:
> > > X-UID: 600
> > >
> > > Ok this is what I'm doing:
> > >
> > > I produce an XML file from data stored on a mainframe. The XML is generate in a
>VB object. The XML is
> > > passed up to an ASP page that makes a Low Level API SOAP call, using MSSOAP
>Toolkit 2.0, to my PDF server.
> > > The PDF server is running Tomcat 4/Apache SOAP 2.2.
>
> Concerning Apache SOAP 2.2: You might want to have a look at Axis
> (http://xml.apache.org/axis) which is a floolow-on for SOAP 2.2. I think
> I heard once that it is based on SAX rather than DOM. Haven't tested it,
> though.
>
> > >
> > > On the PDF server, I receive the XML as literalxml in the envelope, fetch a
>stylesheet, pass the Element
> > > object to a Xalan 2.3 transformer (wrapped in a DOMSource object), and then
>transform the XML into XSL:FO
> > > objects.
> > >
> > > Now I have a Document object that was returned from the transformer wrapped in a
>DOMResults object. The
> > > next step is where the problem lies. I want to pass the Document to a Driver,
>but I get the dreaded
> > > NullPointerException.
> > >
> > > Most of the time, the XML is will be small ( 5 - 7K), but there is a potention
>for an account to have 5 to
> > > 10 thousand transactions in a day, and we store up to 63 days of data (a single
>transaction in XML is 594
> > > bytes, therefore a 630K transaction XML file would be 374MB, plus some extra
>data at the top). So you can
> > > see what I have the potential to deal with.
> > >
> > > What I don't even know is how FOP will handle this. The XSL:FO file is sure to
>be much larger than 380MB.
> > > I transformer a 6.66KB XML file and it produced a XSL:FO file of 16.2KB. If we
>use that as a benchmark,
> > > than the same 374MB would become 909.8MB. That's a whole lot of RAM, not to
>mention what FOP is going to
> > > use to store the rendered PDF.
>
> I hope you will be lucky. Some have reported that big documents work
> well. Others were not so lucky. As long as there are not many references
> in your documents you should get quite far. You can browse the archives.
> There has been a number of discussions on this topic.
>
> > > I'm hoping that someone can poke a hole in these numbers (please), because this
>is getting to look a whole
> > > lot bigger than expected. Obviously performance and resource utilization are
>major concernes (like when are
> > > they not?). Obviously SAX for this would be faster because it wouldn't require
>loading the entire XML
> > > contents into memory.
> > >
> > > So, now is here the questions come in. Do I return from the transform a
>SAXResults? Also, how do I
> > > effectively handle the incoming XML into the SOAP method? I would prefer to
>send the XML in literalxml
> > > format so the < and > are HTML encoded (increasing the size of the content even
>more).
> > >
> > > Where do I go from here?
> > >
> > >
> > > On Fri, Mar 22, 2002 at 04:49:40PM +0100, Jeremias Maerki wrote:
> > > > <comment>Oops, that one didn't make it to the list at first.</comment>
> > > >
> > > > DOM (Document) should work. But using DOM to process a 400MB XML? You
> > > > wouldn't want to do that. Try to find a way to use SAX. You can fill SAX
> > > > events into FOP to create the FO tree. Maybe it helps us to provide you
> > > > with some pointers and ideas if you tell us what exactly you're trying
> > > > to do.
> > > >
> > > > > I'm sorry to post this again but I need help. Does passing a Document
>datatype to the Driver
> > > > > render() method work? I have to potential to move XML files in excess of
>400MB and so I need to avoid as
> > > > > moving of data in memory as possible.
>
> Cheers,
> Jeremias M?rki
>
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>
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