Drools-将java.util.collection作为输入传递给functions.drl时出错

Question

Drools-将java.util.collection作为输入传递给functions.drl时出错

rule1.drl

when 
        $insitution:InstituteEntity( $departments:departments )
        Boolean(booleanValue == true) from (
        !validate($departments) 
        )
     then
         //Logic
     end

错误：

[Error: unable to resolve method using strict-mode: com.rules.validate.validate(java.util.Collection)]
[Near : {... !validate($depa...}]
              ^]]