[rules-users] use a boolean returned type function in "when", doesn't work, why?

[mrj]

ok，thank you ,let me have a try,  your adverse is helpful, thank you!
At 2013-10-11 22:17:05,"Wolfgang Laun" <wolfgang.laun at gmail.com> wrote:
>Read the section on the "Conditional Element eval" in the Expert
>manual (and more of the same manual, especially Chapter 4,  Rule
>Language Reference).
>
>-W
>
>On 11/10/2013, merry0900 <m1e1r1r1y at 163.com> wrote:
>>
>> my drl file like this：
>> import ********
>> function boolean isNotNull(String a){
>> if(a!=null){
>> return true;}
>> return false;
>> }.
>> rule a
>> when
>>         isNotNull("aaaa");
>> then
>>        // mycode
>> end
>>
>> how i could use like this， thank you  all
>>
>>
>>
>> --
>> View this message in context:
>> http://drools.46999.n3.nabble.com/use-a-boolean-returned-type-function-in-when-doesn-t-work-why-tp4026339.html
>> Sent from the Drools: User forum mailing list archive at Nabble.com.
>>
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