Hi, I have the following drl file. ================================== package bugTestingFail rule "Price hits Target" when eval ( true ) then end ================================== It is managed by a RuleAgent. However, when I change the drl file from the source, I get the following exception: RuleAgent(MARKET_DATA) INFO (Wed Aug 06 15:43:53 EST 2008): Applying changes to the rulebase. RuleAgent(MARKET_DATA) EXCEPTION (Wed Aug 06 15:43:53 EST 2008): org.drools.reteoo.EvalConditionNode$EvalMemory cannot be cast to org.drools.reteoo.BetaMemory. Stack trace should follow. java.lang.ClassCastException: org.drools.reteoo.EvalConditionNode$EvalMemory cannot be cast to org.drools.reteoo.BetaMemory at org.drools.reteoo.EvalConditionNode.doRemove(EvalConditionNode.java:265) at org.drools.common.BaseNode.remove(BaseNode.java:87) at org.drools.reteoo.RuleTerminalNode.doRemove(RuleTerminalNode.java:505) at org.drools.common.BaseNode.remove(BaseNode.java:87) at org.drools.reteoo.ReteooBuilder.removeRule(ReteooBuilder.java:242) at org.drools.reteoo.ReteooRuleBase.removeRule(ReteooRuleBase.java:366) at org.drools.common.AbstractRuleBase.removeRule(AbstractRuleBase.java:705) at org.drools.common.AbstractRuleBase.removePackage(AbstractRuleBase.java:622) at org.drools.agent.PackageProvider.removePackage(PackageProvider.java:45) at org.drools.agent.PackageProvider.applyChanges(PackageProvider.java:63) at org.drools.agent.RuleAgent.refreshRuleBase(RuleAgent.java:320) at org.drools.agent.RuleAgent$2.run(RuleAgent.java:438) at java.util.TimerThread.mainLoop(Timer.java:512) at java.util.TimerThread.run(Timer.java:462) This only happens to me when I am editing rules files that have an eval condition. I this a bug?