groovy - Order is not working with criteria in Grails -

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i have started working groovy , grails , has confusion on order clause criteria.

below code,

def order = "rollnumber" def orderby = "asc"   studentlistcriteria = students.createcriteria()  int max = 6 int offset = params?.offset ? integer.valueof(params.offset) : 0  def studentlist = studentlistcriteria.list(max: max, offset: offset) {         , {             eq("isactive", boolean.true )         }         order(order,orderby)     }

while executing it's throw below error.

groovy.lang.missingmethodexceptionmessageno signature of method: java.lang.string.call() applicable argument types: (java.lang.string, java.lang.string) values: [rollnumber, asc] possible solutions: wait(), any(), tr(java.lang.string, java.lang.string), trim(), find(), size()

can suggest doing wrong here??

please check below code, can not use keywords here. 

def orderparameter = "rollnumber"//change name of variable. def orderbyparameter = "asc"   studentlistcriteria = students.createcriteria()  int max = 6 int offset = params?.offset ? integer.valueof(params.offset) : 0  def studentlist = studentlistcriteria.list(max: max, offset: offset) {         , {             eq("isactive", boolean.true )         }         order(orderparameter,orderbyparameter)     }

here, using order variable. please change name of , go.


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