Why don't you use some profiling toool to find out where exactly is the leak
occuring.
Two of the good ones are JProbe from http://www.klgroup.com/ and Optimizeit
from http://www.optimizeit.com/
A trial version for both is available.
That way you can be sure.
----- Original Message -----
From: "Zach Bagnall" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Saturday, November 27, 1999 3:30 PM
Subject: [JAVA2D] Java 2D && JAI == Memory Leak? Say it ain't so..
> Hi all. If you read to the end of this message I'd appreciate it - first a
> little background so you know what I'm on about..
>
> I've been developing a servlet system over the past 9 months. One part
> of it involves receiving a jpeg file via http upload and processing it.
> The system is running on Apache JServ with Apache on Redhat linux 6.0 on a
> PIII-450/512mb RAM. JVM is Blackdown's 1.2 JDK.
>
> Processing an image involves:
>
> Creating a thumbnail image and saving that under the htdocs directory.
> Creating a larger thumbnail image and compositing it with another image,
> then saving it under the htdocs directory.
> Moving the original image to another directory.
>
> The images are reasonably large - up to 3000x3000 pixels, but more often
> around 2000x1500.
>
> I've developed several solutions to this task, including:
>
> AWT all the way. JpegEncoder to write the images.
> JAI all the way.
> JAI to read the image, Java 2D for processing, JpegEncoder for writing.
>
> No matter what I do, the system always runs out of memory after a dozen or
so
> images are processed. Watching the memory usage on the server before and
> after each image is processed, I see that the JServ java processes
increase
> by 5-6mb each time until it's full. This shouldn't happen right?
>
> I've been very careful with the code to make sure there is no static code
> that could be messing things up and all variables are instance (that is,
> defined within the main method). In JAI, I've told it to use a cache of
size
> zero to prevent it from caching tiles.
>
> I'm out of ideas for java so I'm currently writing a C program that uses
> the Image Magick API to do the processing. I'll call this from the servlet
> via JNI. I'm pissed that I have to resort to that because every other part
> of the system is platform-independant.
>
> If I can't make that work then I'll have to go to some kind of delayed
> processing using perl and a cron job I think.
>
> It's bloody depressing to think that for all java's good points (it is a
> great language) it is INCAPABLE of processing images in real time, one
> after the other indefinately.
>
> If you've got any great ideas I'd love to hear them. This really sucks
> and I will think carefully about using java for the next big project if
> it has such showstopping limitations as this.
>
> Zach Bagnall.
>
> JServ is 1.0
> Apache is 1.3.6 with DSO support
> JVM is jdk1.2-prev2
>
>
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