Eh? 1157 has nothing to do with a CHM in UnversionedNode. I did try using a CHM at one point, which did "hide" the issue again, but this posed other problems (inability to store nulls in the node). It's back to HashMap in UnversionedNode now, and the correct fix for 1157 is in the PessimisticLockInterceptor. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4069022#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...