case 1 could be:

package something

dialect "java" 

rule "Some rule"
   when
      Something()
   then
      try{
         callSomeDangerousLogicHere();
      catch (Exception ex){
         //manage your exception here
      }
end

The second approach is to write something like this in your java code:

ksession.insert (someObject);
...

try{
   ksession.fireAllRules();
} catch (Exception e){  // <-- This will be a ConsequenceException
   //manage your exception here
}

  
Best, 

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Esteban Aliverti
- Developer @ http://www.plugtree.com
- Blog @ http://ilesteban.wordpress.com


2010/10/13 sumatheja <sumatheja@gmail.com>
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@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@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@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@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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--
cheers
Sumatheja Dasararaju



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rules-users mailing list
rules-users@lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users




--
cheers
Sumatheja Dasararaju



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