[rules-users] counting facts of a kind

[Wolfgang Laun]

No, not knowingly :-) I'm using the simplest possible setup for
KnowledgeBase, KnowledgeBuilder, StatefulKnowledgeSession.

Why should accumulate/count effect persistence?

-W


2010/8/23 Swindells, Thomas <TSwindells at nds.com>

>  You’ve probably configured your system to be using persistence?
>
> In which case what you are persisting needs to be serializable so that it
> can be persisted
>
>
>
> Thomas
>
>
>
> *From:* rules-users-bounces at lists.jboss.org [mailto:
> rules-users-bounces at lists.jboss.org] *On Behalf Of *Wolfgang Laun
> *Sent:* 23 August 2010 12:17
> *To:* Rules Users List
> *Subject:* [rules-users] counting facts of a kind
>
>
>
> As simple as it gets:
>
> rule countHigh
> when
>     $n : Number() from accumulate ( $sgc : StartGoalConn() count( $sgc ) )
> then
>     System.out.println( "plain routes: " + $n );
> end
>
> And yet, it fails:
>
> Exception in thread "main" org.drools.RuntimeDroolsException:
> java.lang.ClassCastException: rss.ixl.route.TrainStartGoalConn cannot be
> cast to java.io.Serializable
>
> Sure, adding "implements Serializable" to StartGoalConn fixes this. But why
> is this necessary?
>
> FYI, StartGoalConn is abstract superclass of TrainStartGoalConn - just in
> case this has some bearing on this issue.
>
> Best
> -W
>
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