So apparently the default allocationSize is 50 instead of 1. Changing it to 1 has resolved the issue. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4257507#4257507 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4257507