Some more info regarding this from the java bug database (bug #5077277 ):
FULL PRODUCT VERSION :
Tested with 1.4.2_03, 1.4.2_04 and 1.3.1_06
A DESCRIPTION OF THE PROBLEM :
As described in Bug 4548840, the ZipFile class maps the zip file into memory in
current Java releases.
The problem here is
We are running jboss 3.2.5, jdk (build 1.5.0-b64) on a 64-bit opteron running linux.
On occasion we get the following OutOfMemory when starting jboss. The error is
sporadic and in all cases when we restart the server the problem goes away.
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