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

[Davide Sottara]

The exceptions you reported may be due to a serious RETE corruption... 
in the first case, it seems that a JoinNode is trying to access a FromNode's
memory...
in the latter, a constraint's context can not be retrieved correctly.
The solution you propose avoids the exception, but is only removing the
symptom and no

Did you check that the KnowledgeBuilder didn't report any error during the
construction phase?
Otherwise, I'd need to see the rules or a unit test that reproduces the
problem.
Thanks
Davide 



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