Re: FOP Servlets being invoked twice
It happened to me using IE to Tomcat on the local machine using 'localhost'. I switched to using the real network interface and it fixed itself. Joe Alex Amies wrote: I have a problem with a servlet, which serves up pdf documents, invoking the servlet twice for every time I request the url using my browser. The pdf document is produced correctly in both instances. Anybody else seen this problem, know what it is, or have a constructive suggestion? The servlet gets data from a database, formats into xml, transforms it with Xalan, then again to a pdf, sending the content to a byte array where it is then written to the output stream. Here is a code fragment: Writer writer = new StringWriter(); // Get an xslt processor factory TransformerFactory tFactory = TransformerFactory.newInstance(); // Create the 3 objects the XSLTProcessor needs to perform the transformation. ReportInfo reportInfo = getReportData(request,res); String xml = reportInfo.getXml(); StringReader stringReader = new StringReader(xml); Source xmlSource = new StreamSource(stringReader); Source xslSheet = getXSLInput(reportInfo.getReportNo()); StreamResult xmlResult = new StreamResult(writer); Transformer transformer = tFactory.newTransformer(xslSheet); // Perform the transformation. transformer.transform(xmlSource, xmlResult); // send output from xsl transformation to a string reader // create a input source containing the xsl:fo file which can be fed to Fop Reader reader = new StringReader(writer.toString()); writer.flush(); writer.close(); //set Driver methods to start Fop processing Driver driver = new Driver(); driver.setRenderer(org.apache.fop.render.pdf.PDFRenderer,.14); driver.addElementMapping(org.apache.fop.fo.StandardElementMapping); driver.addElementMapping(org.apache.fop.svg.SVGElementMapping); driver.addPropertyList(org.apache.fop.fo.StandardPropertyListMapping); driver.addPropertyList(org.apache.fop.svg.SVGPropertyListMapping); // send pdf writer output to a byte array stream ByteArrayOutputStream baos = new ByteArrayOutputStream(); PrintWriter printWriter = new PrintWriter(baos); driver.setWriter(printWriter); driver.buildFOTree(parser, new InputSource(reader)); driver.format(); driver.render(); // send the bytes out to the servlet output stream res.setContentType(application/pdf); res.setContentLength(baos.size()); long sixty = System.currentTimeMillis() + 60*1000; res.setDateHeader(Expires, sixty); baos.writeTo(res.getOutputStream()); res.flushBuffer(); - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, email: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, email: [EMAIL PROTECTED]
Re: FOP Servlets being invoked twice
Alex McLintock wrote: I've seen the content size problem (which you have correctly solved in your code) but now I have a problem with a particular build of IE. Basically the PDF doesn't appear - in fact neither does acrobat reader The problem occurs on the IE version 5.50.4522.1800 and not with other IE5.5 versions, eg. 5.50.4134.0600. We found that Acrobat with 'Web Browser Integration' turned on failed to render almost always. Switching to Acrobat 5.0 or turning off the web browser integration caused the rendering to work just fine. Joe - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, email: [EMAIL PROTECTED]
RE: FOP Servlets being invoked twice
Thanks for the tip on IE behaving like this. I don't agree with the suggestion about using DOM to build up a document. Intuitively it does not make sense to have Xalan parse the document out when the program that constructs it knows the structure. There are several problems with this, however: (1) It is more convoluted to code DOM than dealing with strings. (2) It will be slower. Xalan does not use DOM to store nodes in an xml document since it creates too many objects. (3) It will take more memory since storing the document in a DOM will use more memory than a StringBuffer. -Original Message- From: David Frankson [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 08, 2001 12:33 PM To: [EMAIL PROTECTED] Subject: Re: FOP Servlets being invoked twice As far as I know, IE has always done 2 requests per mime type that it doesn't handle internally. See Article ID: Q293336 in the M$ knowledge base. Netscape and all others only do 1 request. If anyone knows a configuration that can get IE to behave, please let me know I do suggest adding response.addHeader(Content-Disposition, inline; filename=report.pdf); it will fix some glitches in IE5.0, and also have you considered using a Dom Document rather than a string to pass your xml around? It would save you from having to parse it twice when you go from your business object to Xalan, and from Xalan to FOP. Dave - Original Message - From: Alex Amies [EMAIL PROTECTED] To: [EMAIL PROTECTED] Cc: Tim Kearney [EMAIL PROTECTED] Sent: Wednesday, August 08, 2001 11:15 AM Subject: FOP Servlets being invoked twice I have a problem with a servlet, which serves up pdf documents, invoking the servlet twice for every time I request the url using my browser. The pdf document is produced correctly in both instances. Anybody else seen this problem, know what it is, or have a constructive suggestion? The servlet gets data from a database, formats into xml, transforms it with Xalan, then again to a pdf, sending the content to a byte array where it is then written to the output stream. Here is a code fragment: Writer writer = new StringWriter(); // Get an xslt processor factory TransformerFactory tFactory = TransformerFactory.newInstance(); // Create the 3 objects the XSLTProcessor needs to perform the transformation. ReportInfo reportInfo = getReportData(request,res); String xml = reportInfo.getXml(); StringReader stringReader = new StringReader(xml); Source xmlSource = new StreamSource(stringReader); Source xslSheet = getXSLInput(reportInfo.getReportNo()); StreamResult xmlResult = new StreamResult(writer); Transformer transformer = tFactory.newTransformer(xslSheet); // Perform the transformation. transformer.transform(xmlSource, xmlResult); // send output from xsl transformation to a string reader // create a input source containing the xsl:fo file which can be fed to Fop Reader reader = new StringReader(writer.toString()); writer.flush(); writer.close(); //set Driver methods to start Fop processing Driver driver = new Driver(); driver.setRenderer(org.apache.fop.render.pdf.PDFRenderer,.14); driver.addElementMapping(org.apache.fop.fo.StandardElementMapping); driver.addElementMapping(org.apache.fop.svg.SVGElementMapping); driver.addPropertyList(org.apache.fop.fo.StandardPropertyListMapping); driver.addPropertyList(org.apache.fop.svg.SVGPropertyListMapping); // send pdf writer output to a byte array stream ByteArrayOutputStream baos = new ByteArrayOutputStream(); PrintWriter printWriter = new PrintWriter(baos); driver.setWriter(printWriter); driver.buildFOTree(parser, new InputSource(reader)); driver.format(); driver.render(); // send the bytes out to the servlet output stream res.setContentType(application/pdf); res.setContentLength(baos.size()); long sixty = System.currentTimeMillis() + 60*1000; res.setDateHeader(Expires, sixty); baos.writeTo(res.getOutputStream()); res.flushBuffer(); - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, email: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, email: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, email: [EMAIL PROTECTED]
Re: FOP Servlets being invoked twice -- MSIE 5.50.4522.1800 problem
On Wednesday, August 8, 2001, Alex McLintock [EMAIL PROTECTED] wrote: ... but now I have a problem with a particular build of IE. Basically the PDF doesn't appear - in fact neither does acrobat reader The problem occurs on the IE version 5.50.4522.1800 and not with other IE5.5 versions, eg. 5.50.4134.0600. (Incidently the data is submitted to the servlet using Post - apparently this is the cause of the bug in IE) Not sure what bug you are talking about here, but I don't think your problem is associated with doPost(). [...] So folks - what are your servlet experiences? We don't serve up PDF via FOP (yet) but we do let users download PDFs which we have just cranked out by some other rickety process. This worked quite well for several years, when all of a sudden, it didn't. We first isolated the problem to both MSIE 5.50.4522.1800 and oddly enough, NS 6.0, both on Win2k systems. Weblogic was showing a socket exception error message in the command console window. We tried all the usual server side tricks (e.g., res.setContentLength(), and so on), but they had no effect. We hunted everywhere for an explanation, and essentially found none. Posting to various newsgroups led no where. However, while I was stumbling around on Microsoft's site, I somehow wound up on their updates page, and noticed that I hadn't updated much in the last however many months. One of the first things I updated was second or third release of patches to MSIE 5.50.4522.1800. I believe it was the Q299618 patch that restored the ability to download using MSIE 5.50.4522.1800. Currently, the About MSIE (or whatever it's called in the Windows version) lists the following updates: SP1; Q286043; Q299618 Note that this latest patch appeared on MS's Critical Updates page. Also note, MSIE on MacOS X never showed this problem. Neither did OmniGroup's OmniWeb for MacOS X. Paul Furbacher http://www.teamb.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, email: [EMAIL PROTECTED]
