[rules-dev] unknown error while parsing

[Edson Tirelli]

   People,

   Just as an explanation, the DRL language is a fairly complex language
from a parser perspective. We generate our parser using ANTLR that is an
amazing tool, but due to the complexity of the grammar, it is hard to
foresee all possible runtime exceptions that might occur when someone uses
an incorrect syntax.

   In such cases, the parser may raise a runtime exception like a NPE. To
avoid blowing the application using the parser or the Drools IDE, we added a
catch all exceptions with the message: "this is a bug, contact the
development team" when that happens. This is to direct you, users, to report
us what kinds of incorrect syntax make the parser explode. Once found, it is
farly easy to fix. So, thanks for reporting. I opened a JIRA for that. If
anyone knows of other cases that cause the same kind of errors, please add
comments to the ticket.

   Also, if someone would like to contribute to the project by getting some
trained zoo monkeys to bash the keyboard looking for invalid sentences that
blow up the parser, it is highly appreciated. ;)

https://jira.jboss.org/jira/browse/JBRULES-2151

    Cheers,
      Edson

2009/6/30 Wolfgang Laun <wolfgang.laun at gmail.com>

> Daniel:
>
> the last line of your conditions containing "($tag memberOf $tage)" is
> syntactically incorrect; such a condition must be written as an 'eval' CE,
> i.e.:
>    eval($tag memberOf $tage)
>
> -W
>
>
> On 6/30/09, Boschung Daniel <Daniel.Boschung at rtc.ch> wrote:
>
>>
>> hi folks
>>
>> drools prompt me to contact the development team. the following error
>> apears, whithout stacktrace, while developing
>> a rule. maybe the error is known to you?!
>>
>> thanks for a little statement
>>
>>  daniel
>>
>>
>> _______________________________________________
>> rules-dev mailing list
>> rules-dev at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-dev
>>
>>
>>
>
> _______________________________________________
> rules-dev mailing list
> rules-dev at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-dev
>
>


-- 
 Edson Tirelli
 JBoss Drools Core Development
 JBoss by Red Hat @ www.jboss.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.jboss.org/pipermail/rules-dev/attachments/20090630/d521b88c/attachment.html