OutOfMemory on Sun Java 1.4.2 on Linux

Hi all,
My application (on JBoss) is experiencing strange problem on one of our environment - on Linux on Itanium 2 - Sun Java 1.4.2_07 and 64 bit.
On all other platforms (windows, linux, 32 bit) is ok.
After 2-3 http requests the OutOfMemory exception is thrown.
Java is started with -Xmx1024M. In fact the bahaviour is exactly the same as -Xmx512M.
'uname -a' shows unlimited resources for memory.
There is plenty of free memory in the system (main and swap) - for example I can run 3 such java processes at the same time - but each is reporting out of memory after few requests as it is for one java spawned.
'top' shows that java eats ~400M when the OutOfMemory is thrown.

Where to look, what to check?
	taab
.

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