Incorrect syntax near '?'.

Dear experts
 I am using this sql (our database is Ms SQL Server 2008 and we have defined our sql in a spring xm file)
 

select distinct cg.NAME as CustomerGroup,COUNT(cg.NAME) as GroupCount		 
		 FROM PAC.CustomerGroupMap cgmap,
		 PAC.CustomerGroup cg,			
		 PAC.Customer Customer,
		 PAC.Customercluster customerRef
		 where cg.CustomerGROUPID = cgmap.CustomerGROUPID and
		 cgmap.CustomerID = Customer.CustomerID 
		 and customerRef.CustomerGROUPID = cgmap.CustomerGROUPID
		 and (customerRef.MODIFIEDBY != 'Migration' OR customerRef.ISACTIVE != 'F')
		 and customerRef.CLUSTERID = ?
		group by cg.NAME		
		having COUNT(cg.NAME) = 1

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            But it gives this exception
                  ]; nested exception is com.microsoft.sqlserver.jdbc.SQLServerException: Incorrect syntax near '?'.
                  
                  the parameter passed is a number like 100, 200, ect.
                  Any clue where the problem is.
                  
                  Thanks.