@SuppressWarnings({"unchecked","rawtypes"}) public boolean isConcretModelClass(Class clazz){
  return clazz.getAnnotation(Cf.class) != null;
}

@ SuppressWarnings ( { "unchecked" , "rawtypes" } ) public boolean isConcretModelClass ( Class clazz ) { return clazz . getAnnotation ( Cf . class ) != null ; }
check the clazz if it has cf annotation
