Re: [rules-users] threw error java.lang.ClassCastException: org.drools.reteoo.FromNode$FromMemory cannot be cast to org.drools.reteoo.BetaMemory

Ok, so it's quite likely that something bad happens during one of those addKnowledgePackages. Would you be able to help us debug it? We'd need to trace the last addition/removal before the exception was generated. Another way to look at this, would be to catch and debug the exception to see which RETE node(s) are involved and thus which rules. In the CCE you reported, a FromNodeMemory is returned in place of a JoinNodeMemory.. it probably happens in the class org.drools.common.ConcurrentNodeMemories, where memories are indexed by node id. I suspect that during one of those add/remove cycles a node id was reassigned without clearing the memory cache first. In particular, the method BaseNode.doRemove() should be called for the FromNode owning the id which ends up being assigned to the JoinNode. My first tentative guess would be that the FromNode is detected as still being in use even if it is marked for removal. Davide On 04/26/2013 05:05 PM, mohdejaz74 wrote: