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Re: No Instance issue from WebPDFReports 1.0
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Re: No Instance issue from WebPDFReports 1.0


  • Subject: Re: No Instance issue from WebPDFReports 1.0
  • From: "Koksiong" <email@hidden>
  • Date: Tue, 25 Oct 2005 10:56:40 +0800 (SGT)
  • Importance: Normal

hi, all

thanks for advices, i tried to disabled the Caching enabled in the
Instance Settings, it seems solve the no instance problems. lol

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?


rgds,
koksiong

> 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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>>
>> --
>> Coming in 2006 - an introduction to web applications using WebObjects
>> and Xcode     http://www.global-village.net/wointro
>>
>> Practical WebObjects - for developers who want to increase their
>> overall knowledge of WebObjects or who are trying to solve specific
>> problems.
>> http://www.global-village.net/products/practical_webobjects
>>
>>
>>
>>
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>>
> http://www.freeiPods.com/?r=21419063
>
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  • Follow-Ups:
    • Re: No Instance issue from WebPDFReports 1.0
      • From: Chuck Hill <email@hidden>
References: 
 >No Instance issue from WebPDFReports 1.0 (From: "Koksiong" <email@hidden>)
 >Re: No Instance issue from WebPDFReports 1.0 (From: Chuck Hill <email@hidden>)
 >Re: No Instance issue from WebPDFReports 1.0 (From: Jean-François Veillette <email@hidden>)

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