[rules-users] Ask for help on rule authoring

[Wolfgang Laun]

You can't use a method call as the left hand side operand in a constraint;
thus
   age.size() == 0
is not correct.

Do you really mean
   age == "null"

Probably
  ApplicationData( age == null || age == "" )
is the right thing to do, provided that ApplicationData.age is a String.

-W

On 25 March 2011 17:32, Benson Fung <benson.redhat at gmail.com> wrote:

> Hi,
>
> I got the following rule problem.
>
> The rule is like :
>
> 1.      |       rule "Rule1"
> 2.      |           dialect "mvel"
> 3.      |           when
> 4.      |               ad : ApplicationData( age == "null" , age.size() ==
> 0)
> 5.      |           then
> 6.      |               ad.setReturnMsg( "age should not be null or empty"
> );
> 7.      |       end
>
> where setReturnMsg is a method of ApplicationData Fact();
>
> However, I got the validation error :
>
> [Rule1] [ERR 101] Line 4:49 no viable alternative at input ')' in rule
> "Rule1" in pattern ApplicationData
> [Rule1] [ERR 102] Line 4:51 mismatched input '==' expecting ')' in
> rule "Rule1" in pattern ApplicationData
>
> Please help what the problem is.
>
>
> Thanks
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