taskFormData = task.getExecution().getProcessEngineServices().getFormService().getTaskFormData(task.getId());
recenzenti= task.getExecution().getProcessEngineServices().getIdentityService().createUserQuery().memberOfGroup("recenzenti").list();

formFields = taskFormData. getFormFields();
if(formFields!=null){
   for(field in formFields){
       if( field.getId() == "recenzent"){
           //ovo je nase select polje
           items = field.getType().getValues();
           for(recenzent in recenzenti){
               items.put(recenzent.getId(),recenzent.getFirstName()+" "+recenzent.getLastName());
           }
       }
   }
}