[rules-users] Rules called with null references?

I have this rule: rule "Defrost: Turned On" when $reading : SwitchReading( switchOn == true ) from entry-point "ReadingsStream" not SwitchReading (this.circuit == $reading.circuit, this after $reading ) from entry-point "ReadingsStream" not DefrostSwitchOn(this.circuit == $reading.circuit) then LOG.info("Defrost switch turned on by reading '" + $reading + "'."); insert(new DefrostSwitchOn($reading)); end SwitchReading is an event; DefrostSwitchOn is a POJO fact. Multiple times I've gotten exceptions where this rule's RHS is called with a null. The ConsequenceExceptionHandler is supposed to list the facts the RHS was called with, but it's getting an empty list. Now, I know my system as it currently stands can take a LONG time between receiving an event and executing the consequence, primarily when it first starts and is loading its previous known state. It's entirely believable to me that the event will have expired before the rule's RHS is called. But shouldn't the event still be referenced by the Activation? -- View this message in context: http://drools.46999.n3.nabble.com/Rules-called-with-null-references-tp347... Sent from the Drools: User forum mailing list archive at Nabble.com.