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you may want to check out how many of those entities are configured for caching, in the <container-configurations> element, sub-sub-element <cache-policy-conf>. i found that jboss out-of-the-box defaults to caching an inordinate number of entities for 5 minutes or more, a situation which can exhaust memory, but can be remedied by lowering the numbers in that configuration.
also, some of the mbeans under 'jboss.j2ee' will give you a live picture of how many cached instances are being held in memory. that may confirm this explanation.