[rules-users] Rules Debugging

Vikas Phonsa VPhonsa at mercuryinsurance.com
Mon May 18 13:29:53 EDT 2009


David and Ingomar

Thanks for the help. I want to keep track of exceptions that occur in my production system and maybe send out an email with the list of rule names that were executed and the stack trace.

So WorkingMemoryFileLogger would not work well for me. But I just implemented a AgendaEventListener and seems like it would do the job for me.

I will look into the ConsequenceExceptionHandler also.

Thanks once again.

Vikas

-----Original Message-----
From: rules-users-bounces at lists.jboss.org [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Ingomar Otter
Sent: Monday, May 18, 2009 10:11 AM
To: Rules Users List
Subject: Re: [rules-users] Rules Debugging

David already provided the answer, two more things:
* If your rule's consequences  are throwing exceptions I've also found  
it helpful to register a custom ConsequenceExceptionHandler (depending  
on your actual infrastructure)
*Another way to get that information is to use the  
WorkingMemoryFileLogger as described in here, gives you even a basic  
UI in Eclipse. Despite the name it also includes rules fired.
http://downloads.jboss.com/drools/docs/4.0.7.19894.GA/html/index.html
Caveat: Don't forget the writeToDisk (even on failure) and you may  
need to increase Eclipse' memory allocation.

-- Ingomar


Am 18.05.2009 um 18:43 schrieb Vikas Phonsa:

> Hi All,
>
> I'm using Drools 4.0.7 with Java 1.4.
>
> Some of my rules are throwing exceptions and my goal is to get a  
> list of names of all rules that are being executed (till the point  
> the exception is thrown).
>
> I have tried doing
> stateLesssession.addEventListener( new DebugAgendaEventListener() );
> and it does give me a bunch of information about the agenda. But I  
> want to narrow it down to the rules that are actually executed.
>
> Which event it called right after the execution control goes inside  
> a rule (before the 'when' condition is executed)?
>
> Thanks,
> Vikas
>
>
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