You might want to use the Berkeley DB instead of the FileCacheLoader. There's also a JDBM implementation (I wrote :-) ) that might be adequate. Or, create a "deeper" tree where there are fewer children per node. E.g. if you were to create a phone book, instead of just dividing the entries by "A, B, C" etc., further divide them into "AB" "AC" etc. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4012059#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...