I just hit a bug on the JVM regarding Native Buffers allocations: http://bugs.sun.com/view_bug.do?bug_id=6791815 http://mail.openjdk.java.net/pipermail/hotspot-runtime-dev/2009-January/0... The current status is delivered. (I guess it doesn't mean fixed.. I don't think it's already available at any version). It only happens on JDK 1.6. I'll keep a work around. The allocation needs to be synchronized. What shouldn't be a problem, as this is a really fast operation. I could allocate 100 million buffers in 1.5 seconds. Maybe we will be able to remove the work around later, but shouldn't be a big deal. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4228468#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...