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

[merry0900]

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



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