[rules-users] Out of memory problem

Hi ! I am currently leading a study that compares BRMS. The aim of this study is to determine if a rules engine can be used for our application and what rules engine to use. I made a prototype and I encountered a big problem of memory : no more than 53 objects could be passed as facts. After this threshold, I encountered a java.lang.OutOfMemoryException : Exception in thread "main" java.lang.OutOfMemoryError: Java heap space I increased the memory allocated to the JVM, but the more I insert objects as Facts and the more Drools becomes slower ! I think that the problem is exactly the same as the following one : http://lists.jboss.org/pipermail/rules-users/2007-August/002592.html Can you confirm to me that is the same problem ? And in a positive affirmation, how to solve this problem ? And how much time would it take ? I am using drools 4.0 (developing whith associated eclipse IDE). I realized a dslr that looks like this : package com.sample import XXX.Message; import XXX.MyObject; expander leg_recognizer.dsl rule "rule 1" no-loop true when $m1 is an "OUT" marker $m2 is an "OFF" marker $m3 is an "ON" marker $m4 is an "IN" marker $m4 event date is more than $m1 event date then print "Rule 1" display message $m1 display message $m2 display message $m3 display message $m4 make $m1 treated make $m2 treated make $m3 treated make $m4 treated create a object "1" with state "active"; end rule "rule 2".............(same principle) --> 6 rules in the real file. And it uses the following dsl file : [condition][]{message} is an "{state}" marker={message} : Message(type == "{state}") [consequence][]print "{string}"=System.out.println("{string}"); [consequence][]display message {object}=System.out.println("Message : " + {object}); [consequence][]create a object "{id}" with state "{state}"=insert(new MyObject("{id}", "{state}")); [consequence][]make {message} treated=retract({message}); [condition][]{message1} event date is more than {message2} event date=eval({message1}.isALaterEventThanMessage({message2})) Did I made a mistake in the use of Drools or is this a bug ? Thanks for answers...That's quite urgent !