Java Heap Space

[ka...@gmx.net]

Hi %,


I'm facing a wired issue with the java heap space which is close
to bringing me to the ropes.

The short version is:

I've written a ContentManagementSystem which needs to handle
huge files (>600mb) too. Tomcat heap settings:

-Xmx700m
-Xms400m

The issue is, that uploading huge files works eventhough it's
slow. Downloading files results in a java heap space exception.

Trying to download a 370mb file makes tomcat jump to 500mb heap
(which should be ok) and end in an Java heap space exception.

I don't get it, why does upload work and download not?
Here's my download code:

	byte[] byt = new byte[1024*1024*2];
	
	response.setHeader("Content-Disposition", "attachment;filename=\"" + fileName + "\""); 

	FileInputStream fis = null;
	OutputStream os = null;
	
	fis = new FileInputStream(new File(filePath));
	os = response.getOutputStream();

	BufferedInputStream buffRead = new BufferedInputStream(fis);
	
	while((read = buffRead.read(byt))>0)            
	{
		os.write(byt,0,read);
		os.flush();
	}

	buffRead.close();
	os.close();


If I'm getting it right the buffered reader should take care of any
memory issue, right?

Is there a chance that JSF interferes my tomcat settings?
Any help would be highly appreciated since I ran out of ideas.
	
		Best regards,
		
		   W

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