Just to let you know of our experience with pdf generation and memory
problems ...
We use 'apache fop' and/or 'ujac' for pdf generation, when the report
is too big to be generated in memory, we instead start the task in
another vm like :
...
NSBundle bundle = NSBundle.bundleForClass(UtilitairesFOXML.class);
URL url = bundle.pathURLForResourcePath("Java/FOXML.jar");
String selfJar = url.getPath();
String cmd = "/usr/bin/java -classpath "+ selfJar + "
org.apache.fop.apps.Fop -fo "+ foName +" -pdf "+ pdfName;
Process p = Runtime.getRuntime().exec(cmd);
...
We have no memory problem of generating the report definition (xsl-fo)
from our wocomponent, but transforming the definition to pdf in memory
can cause problem on big report (at least with current version of
apache's fop). That's why we had to do it externaly.
- jfv
Le 05-10-24, à 13:58, Chuck Hill a écrit :
On Oct 23, 2005, at 9:50 PM, Koksiong wrote:
hi,
i am facing a critical problem using WebPDFReports 1.0.
i used to generate quite a number of pdf daily, for each generation,
it
may contain up to 80 pages. for the first generation, it always
works, but
if i continue to generate the pdf , it just gives No Instance error.
Once
it occurs, i need to restart the webobject instance.
Sounds like the application is running out of memory. Check the logs
for "OutOfMemory".
the other modules are working except the pdf component. is it because
the
number of pages generated is too big ?
The problem is at least related to that. I can see from your code
below that the response is getting saved in the page cache, that means
it will hang around consuming memory for quite some time. You will
need to return it in some other manner or override Session.savePage()
to avoid this going into the page cache. I would also suggest
creating an EC on the PDF page and discarding it after use.
Chuck
please advice.
rgds,
koksiong
ps: the following are the code
public WOActionResults goPrintAction()
{
generateVehicleDeliveryListPDF nextPage =
(generateVehicleDeliveryListPDF)pageWithName("generateVehicleDeliveryL
istPDF");
nextPage.setEc(ec);
nextPage.setATransactionArray(aTransactionArray.mutableClone());
PDFPage pdfPage = (PDFPage)pageWithName("PDFPage");
HTML2PDFConvertor pdfConvertor = new
HTML2PDFConvertor();
pdfConvertor.createDocument("US
Letter",HTML2PDFConvertor.LandscapeOrientation);
pdfConvertor.setPaperSize(new PaperSize(792,612));
pdfConvertor.setTopMargin(5);
pdfConvertor.setLeftMargin(5);
pdfConvertor.setRightMargin(5);
pdfConvertor.setBottomMargin(5);
pdfConvertor.setPrintsVerticallyCentered(false);
pdfPage.setConvertor(pdfConvertor);
pdfPage.appendComponent(nextPage);
return pdfPage;
}
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