Channel 0 deselection and JCSystem.makeTransientByteArray memory issues

Hi,
I am writing an applet that should among other things generate HMAC-SHA1 value. However, JCDK 3.02 Classic edition RI does not support Signature.ALG_HMAC_SHA1. That is why I had to make my own HMAC-SHA1 based on MessageDigest.getInstance(MessageDigest.ALG_SHA,false)The problem is that when I transfer data to my HMAC-SHA1 function I create byte [] workbuffer = JCSystem.makeTransientByteArray((short)(blockLength + datalength), JCSystem.CLEAR_ON_DESELECT); inside of my HMAC-SHA1 function. I cannot do memory allocation in constructor since I don't know the data length in advance. This function works fine only the first time, on the second run the apllet runs out of memory.
From my MIDlet I call myConnection.close() to close the connection and deselect the applet before passing new data to applet for HMAC generation. But according to Security and Trust Services APIs for Java 2 Platform "the application selected on channel 0 is not deselected at the time the connection is closed but remains selected until a new connection is established on channel 0". So, the next time I open connection to my applet and pass data to HMAC-SHA1 I get throw_error(SYSTEMEXCEPT_NO_TRANSIENT_SPACE) from cref in the console window.
Is there anything I can do with this memory problem? How can I eventually deselect the applet to free the memory?
//Aleksandr

Argh! Poor card :-)
NEVER allocate memory outside of the constructor or initialization methods (called once then disabled)! Forget JavaCard 3, use 2.2 and remember you have 2KB RAM in all cards of these world. The 2MB-RAM/16MB-Flash cards simulated in the javacard SDK for netbeans exists only in the imagination of this spec creators.
Allocate a fixed size buffer and process data in blocks. The update() method is here for this purpose.
This is not java desktop, memory is more than scarce!
transient memory allocated with the TRANSIENT_DESELECT flag is allocated for every logical channels to allow implementing multi selectable applets with independent contexts.
transient memory allocated with the TRANSIENT_RESET flag is allocated once for every channels.

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Hello again.
N.B: I am an ex-PE3 user.
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Hi everyone:
Thankyou for all your suggestions.
Sorry, Bill, but both those links give me an error message. I was all set to read them, but they won’t work, unfortunately.
What is meant by ‘page file managed’, sorry? And do you mean ‘hard disk drives’ by HDD, or does it stand for something else in this context? I’m not sure what you mean by how do I have them allocated. Again, apologies for my ignorance. I do have only one HDD, but it is partitioned.
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From: Bill Hunt [email protected]
Sent: Friday, 11 March 2011 2:00 AM
To: rachel jewiss
Subject: Rendering and Low System Memory issues in PE9.
although I will say that this 'low system memory' issue seems to be worst today, as I'm adding more still photos.
What are the pixel x pixel dimensions of those still images?
What is the Frame Size of your Project?
How is your Page File Managed, and what is the size? This http://forums.adobe.com/thread/632449?tstart=30 will give you some background and tips.
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For more discussion on Rendering, please see this http://forums.adobe.com/thread/794719?tstart=0.
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Message was edited by: tgiadd

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PLease find the attached screen shot of the block diagram.
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Attachments:
Block diagram.jpg ‏208 KB

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