[rules-users] NPE in SlidingTimeWindow$SlidingTimeWindowComparator

[Rob Crawford]

I've tried to create an example, but when I try to isolate the problem, it goes away. It's apparently an interaction between multiple rules, and I can't seem to come up with minimal set.

Are there any guidelines for writing rules in STREAM mode? I'm banging my head against the wall, getting different problems and seeing behavior that doesn't make sense based on my experience with CLOUD mode.


On Oct 7, 2011, at 19:42, Edson Tirelli <ed.tirelli at gmail.com> wrote:

> 
>   Hi Rob,
> 
>   Can you please provide the test case (open a JIRA with it) or at least a description of what kind of events are you feeding in and with which frequency so that we can try to reproduce the problem?
> 
>   The NPE where you mentioned is the symptom... the problem is elsewhere...
> 
>   Edson
> 
> 2011/10/6 Rob Crawford <crawford at kloognome.com>
> 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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> 
> 
> -- 
>   Edson Tirelli
>   JBoss Drools Core Development
>   JBoss by Red Hat @ www.jboss.com
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