On Tue, 2004-01-27 at 16:14, Subbareddy Kalakota wrote:
Have replied to Subbareddy off-line to the effect that his
problem might be one of thread-safety.
He has several class variables (eventMappings, factory,
driver and log) that must be thread-safe in order for the
servlet to work.
I suspect that the Driver class isn't thread-safe, leading to
his problem.
> Hi,
> I am using FOP to generate PDF reports from servlet. I am generating and
> storing the pdf report into file and serving that file so that I am avoiding
> repeating calls from browser. every thing going fine, I am able to generate
> pdf reports in development env(windows) and testing (AIX) but when a load
> test is performed on application(AIX, Websphere 5), pdf reports are failing
> after some time(like 20 users concurrently accessing the reports ) but all
> other functions of applicaiton running fine. Here is the exception I am
> getting and followed by the pdf code segment that causing this exception.
>
> Please let me know if I am doing wrong any where.
>
> I am guessing ,Driver has some problem, like hanging or not getting
> destroyed.
>
> Thanks
> subbareddy.
>
>
> org.apache.fop.apps.FOPException: root must be root element
> at
> org.apache.fop.fo.FOTreeBuilder.startElement(FOTreeBuilder.java(Compiled
> Code))
> at
> org.apache.xalan.transformer.ResultTreeHandler.flushElem(ResultTreeHandler.j
> ava(Compiled Code))
> at
> org.apache.xalan.transformer.ResultTreeHandler.flushPending(ResultTreeHandle
> r.java(Compiled Code))
> at
> org.apache.xalan.transformer.ResultTreeHandler.endElement(ResultTreeHandler.
> java(Compiled Code))
> at
> org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java(
> Compiled Code))
> at
> org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApp
> lyTemplates.java(Compiled Code))
> at
> org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.jav
> a(Compiled Code))
> at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Transform
> erImpl.java(Compiled Code))
> at
> org.apache.xalan.transformer.TransformerImpl.applyTemplateToNode(Transformer
> Impl.java:2081)
> at
> org.apache.xalan.transformer.TransformerImpl.transformNode(TransformerImpl.j
> ava:1137)
> at
> org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:
> 600)
> at
> org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:
> 1054)
> at
> org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:
> 1032)
> at
> com.verizon.wbtt.components.servlet.controller.ControllerServlet.outputXML2P
> dfFile(ControllerServlet.java(Com
> piled Code))
> at
> com.verizon.wbtt.components.servlet.controller.ControllerServlet.doProcess(C
> ontrollerServlet.java(Compiled Co
> de))
>
>
> ********************** Code Segment *******************
>
>
> public class ControllerServlet extends HttpServlet {
>
> private HashMap eventMappings;
> private TransformerFactory factory =null;
> Driver driver=null;
> private org.apache.avalon.framework.logger.Logger log= new ConsoleLogger
> (ConsoleLogger.LEVEL_FATAL);
>
> public void init() {
> String eventMappingsURL = null;
> try{
>
> factory=TransformerFactory.newInstance();
> MessageHandler.setScreenLogger(log);
> driver = new Driver();
> driver.setLogger(log);
> driver.setRenderer(Driver.RENDER_PDF);
> }
> protected void outputXML2PdfFile (Source xml, String xslt,
> HttpServletRequest request, HttpServletResponse response) throws
> javax.servlet.ServletException, IOException, FOPException,
> TransformerException {
> String id = getServletConfig().getServletContext().getRealPath("/");
> org.apache.fop.configuration.Configuration.put("baseDir", id);
>
> HttpSession session = request.getSession();
> CacheDir pdfDir = (CacheDir) session.getAttribute("__PDFFILEDIR__");
>
> if (pdfDir == null) {
> CacheDir tempDir = (CacheDir)
> getServletContext().getAttribute("__TEMPFILEDIR__");
> if (tempDir == null) {
> //tempDir = new CacheDir (WbtsPdfDir, "temp");
> tempDir = new CacheDir (id, "temp");
> tempDir.mkdir();
> getServletContext().setAttribute("__TEMPFILEDIR__", tempDir);
> }
>
> pdfDir = new CacheDir (tempDir, session.getId());
> pdfDir.mkdir();
> session.setAttribute("__PDFFILEDIR__", pdfDir);
> }
> // end of cache directory
>
> String pdfName = String.valueOf(System.currentTimeMillis()) + ".pdf";
> OutputStream out = new FileOutputStream(new File(pdfDir, pdfName));
> driver.setOutputStream (out);
>
> TransformerFactory factory = TransformerFactory.newInstance();
> factory.setURIResolver(defaultURIResolver());
> StreamSource slt = new
> StreamSource(getServletConfig().getServletContext().getResourceAsStream(xslt
> ));
> slt.setSystemId(id);
> Transformer transformer = factory.newTransformer(slt);
>
> SAXResult res = new SAXResult(driver.getContentHandler());
> res.setSystemId(id);
> xml.setSystemId(id);
> transformer.transform(xml, res);
> out.flush(); out.close();
>
> Logger.trace(Logger.SERVLET_LOGGING,"ControllerServlet().outputXML2PdfFile()
> -- Forwarding to pdf file :"+File.separator + pdfDir.getContextName() +
> File.separator + pdfName);
> RequestDispatcher dispatcher =
> getServletContext().getRequestDispatcher(File.separator +
> pdfDir.getContextName() + File.separator + pdfName);
> dispatcher.forward(request, response);
>
>
> //response.sendRedirect (File.separator + pdfDir.getContextName() +
> File.separator + pdfName);
> }
>
>
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