I'm getting a null pointer exception on either line 232 or 233 of
SlidingTimeWindow. The only window I'm using is:
rule "Mark up to date"
timer(int: 5m)
when
$store: Store()
exists (SensorReading (this.store == $store) over window:time(5m))
then
...
end
The rule never fires; this happens when the sliding time window is expiring
tuples.
It appears the comparator needs to handle nulls, but there's nothing in the
JavaDocs about that.
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