2011/3/25 Wolfgang Laun <wolfgang.laun@gmail.com>

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@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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