[rules-users] Exception Handling in the rule consequence

[sumatheja]

Hi Wolfgang,
Whats the advantage of option 2 over 1? Can you give sample code for option
2??

2010/10/13 Wolfgang Laun <wolfgang.laun at gmail.com>

> 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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>>>>
>>>
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>>
>>
>> --
>> cheers
>> Sumatheja Dasararaju
>>
>>
>>
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>>
>
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-- 
cheers
Sumatheja Dasararaju
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