Re: No Instance issue from WebPDFReports 1.0
Re: No Instance issue from WebPDFReports 1.0
- Subject: Re: No Instance issue from WebPDFReports 1.0
- From: Chuck Hill <email@hidden>
- Date: Mon, 24 Oct 2005 20:23:40 -0700
On Oct 24, 2005, at 7:56 PM, Koksiong wrote:
hi, all
thanks for advices, i tried to disabled the Caching enabled in the
Instance Settings, it seems solve the no instance problems. lol
That seems unlikely. That is the template cache, not the page cache,
that you adjusted. It sounds more like you are now running two
working instances instead of just one.
The first generation looks alright, but following generation
sometimes, it
gives the Session timeout error. in the instance setting , the
settings is
-WOSessionTimeOut 3600. it should not timeout since it's 3600, or
is there
any action might trigger this error?
any idea?
This is the exact same problem and cause as the one you described
before. The No Instance message results when there is only a single
instance running. This message results when there are multiple
instances running and the woadaptor tries to send the request to a
second instance when the first fails to respond. As you have not
implemented session fail over (few apps do), the second instance
fails to restore the session. When this happens, it generates the
session timeout error under the mistaken assumption that this is what
happened.
Chuck
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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