   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@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@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

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Edson Tirelli
JBoss Drools Core Development
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