[rules-users] Exception Handling in the rule consequence

[Wolfgang Laun]

In drl, you could use
  dialect "java"
at outermost level, but one never does, because that's the default.

I'd use option (2).

-W

2010/10/13 sumatheja <sumatheja at gmail.com>

> Hi Wolfgang,
>                   I am actually writing all the rules in a .drl and
> importing them into a guvnor. I didn't mention the dialect explicitly
> anywhere in the code. Is the default dialect MVEL. Is there a way to make
> one time declaration of dialect in my case instead of declaring it for all
> the rules.
>
> 2010/10/13 Wolfgang Laun <wolfgang.laun at gmail.com>
>
> I'd say you are using
>>    dialect "mvel"
>> There is no try/catch statement in MVEL. You have the options:
>>
>> (1) Use Java, not MVEL.
>>
>> (2) Surround the fireAllRules() with try/catch and put it in a loop that's
>> terminated
>> if there is no exception.
>>
>> -W
>>
>>
>> 2010/10/13 sumatheja <sumatheja at gmail.com>
>>
>>> Hi All,
>>>         I have a set of rules. After firing the rules if an exception
>>> occurs in a rule the following rules are not getting evaluated. So i tried
>>> writing a try catch block inside the consequence part of the rule, but then
>>> i get an error saying "'unable to build the consequence.[Error:was expecting
>>> type: java.lang.Object but found type:null]"
>>>
>>> Here follows my code
>>>
>>>
>>> *rule 'Test rule'
>>> ruleflow-group "Test Ruleflow"
>>> no-loop
>>>     when
>>>         $c:Car()
>>>         Driver()
>>>
>>>     then
>>>        try{
>>>           $c.getModel()
>>>           } catch (Exception Ee) {
>>>            System.out.println("caught an exception: "+Ee.toString());
>>>           }
>>> end*
>>>
>>> However if i remove the try catch block it buils fine.
>>>
>>> Can anyone let me know if i'm missing something here.
>>>
>>> Thanks in advance :)
>>> --
>>> cheers
>>> Sumatheja
>>>
>>>
>>>
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>>> rules-users at lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>
>>>
>>
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>>
>
>
> --
> cheers
> Sumatheja Dasararaju
>
>
>
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