[rules-users] Newbie: Why Only One Rule Firing

[Wolfgang Laun]

You are explicitly requesting that only one of Docs1 or Docs2 should be
activated. This is the result of putting them into the same
activation-group.

(From the code you've posted, the no-loop attribute is useless as you don't
do any updates in the consequences. And you are in a stateless session
anyway.)

-W

2010/4/18 <Greg.Zoller at aviall.com>

>
> Hello,
>
> Silly newbie question.  I'm trying to write my first rule set to handle
> permissions and I'm running into a problem where Drools is not executing the
> 'then' clause of all my rules, even though they all resolve to true.
>
> Here's my sample file:
>
> *rule* "Docs1"
>         *activation-group* "permissions"
>         *no-loop* *true*
>         *when*
>                 Resources( $resList : resourceList )
>                 $res : Resource(name=="CUSTOMER", allowed==*false*) *from*$resList
>         *then*
>                 System.out.println("Foo");
> *end*
>
> *rule* "Docs2"
>         *activation-group* "permissions"
>         *no-loop* *true*
>         *when*
>                 Resources( $resList : resourceList )
>                 $res : Resource(name=="INVOICES", allowed==*false*) *from*$resList
>         *then*
>                 System.out.println("Wow");
> *end*
>
> I'm using a StatelessKnowledgeSession something like this:
>
>         ArrayList ruleObjs = new ArrayList();
>         ruleObjs.add(resources);
>         kbase.newStatelessKnowledgeSession().execute(ruleObjs);
>
> So here's my problem.  Both of the rules above resolve to true.  But only
> "Wow" is output to the console.  If I comment out the Docs2 rule entirely
> then "Foo" is output to the console (proving it also resolves true).
>
> Why wouldn't I get "Wow" and "Foo" output to the console (in no particular
> order) when both are run?
>
> To see whether both rules are actually being evaluated I also tried
> creating a simple message function that prints something to the console and
> returning true. Then I eval() my function as the last line of the when
> clause in Docs1.  "Wow" from Docs2 is output as before, as is my function's
> message (proving that Docs1 was evaluated and resolved truthfully), but...
> Docs1 'then' clause is not executed and Foo is not output.  Why?
>
> This scenario holds true if I have lots of rules.  Only the 'then' clause
> of last one resolved true is executed even though there may have been
> several other rules that resolved true.
>
> Thanks in advance for any ideas or help!
>
> Best regards,
> Greg
>
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