It's the way that fop processes the doc. Basically it keeps grabbing memory... a) until you reach the limit of the JVM (i.e. outofmemoryerror fix by starting java with -Xms64M -Xmx320M) or b) until you reach the limit of physical ram available (then the OS starts paging to virtual memory i.e. it hangs) or c) until the end of a page sequence where most of the objects in memory for that page sequence are released, then it starts again
As a general rule of thumb, every fo:tag in your document results in an object in memory. The trick is to not have all of them in memory at the same time. I have generated 2000 page documents with multiple page sequences of 1 or 2 pages, and the memory usage didn't go above 18megs -----Original Message----- From: Kuehnberger [mailto:[EMAIL PROTECTED] Sent: 18 October 2001 09:31 To: [EMAIL PROTECTED] Subject: Re: Servlet stops How can multiple pagesequences help? I mean at the end I still got one fo to render, or am I totally wrong? Colin Savage schrieb: > you can have multiple pagesequences in one document > > -----Original Message----- > From: Kuehnberger [mailto:[EMAIL PROTECTED] > Sent: 18 October 2001 08:55 > To: [EMAIL PROTECTED] > Subject: Re: Servlet stops > > Maybe I could, but then how can I send multiple documents if I just got one > outputstream for my servlet, > or is something like > > Driver driver = new Driver(); > driver.setRenderer( Driver.RENDER_PDF ); > try { > driver.setOutputStream( outputstream ); > driver.render( document ); > } > > byte[] content + = outputstream.toByteArray(); > > in a while loop possible? > > Colin Savage schrieb: > > > The other common problem is long page sequences, if you can break your > > document into multiple page sequences of about 10 to 20 pages, there is > > quite a significant performance improvement > > > > -----Original Message----- > > From: Michail Bikoulis [mailto:[EMAIL PROTECTED] > > Sent: 18 October 2001 08:40 > > To: '[EMAIL PROTECTED]' > > Subject: RE: Servlet stops > > > > Hello, > > > > I'm not sure if this helps but when I convert documents running FOP with > the > > Java command from an MS-DOS window I use the parameters > > > > -Xms64M -Xmx320M > > > > which allocate enough memory for large documents. Is there something > similar > > you can do in a servlet? > > > > Regards, > > > > Mike > > > > -----Original Message----- > > From: Kuehnberger [mailto:[EMAIL PROTECTED] > > Sent: 17. oktober 2001 17:26 > > To: [EMAIL PROTECTED] > > Subject: Servlet stops > > > > Hi, > > > > I'm using fop to generate pdf in a servlet. > > It works fine until the size of the pdf become bigger then 20 pages (I > > have to process files of 200-300 pages). > > Then the servlet will stop when I render the document doc: > > > > driver.render( doc ); > > > > and after some time I get 'page can not be displayed' or > > java.lang.OutOfMemoryError (I got 512MB RAM). > > > > Can somebody tell me how to render big documents on the server. > > > > Jens
