private Page<?> findItemsBySpecification(
     final DynamicRepositoryInvoker invoker,
     final Specification specification,
     final Pageable pageSort) {
   return invoker.findAll(specification, pageSort);
 }
 private List<?> findItemsBySpecification(
     final DynamicRepositoryInvoker invoker, final Specification specification, final Sort sort) {
   return invoker.findAll(specification, sort);
 }
 private long countItemsBySpecification(
     final DynamicRepositoryInvoker invoker, final Specification specification) {
   return invoker.count(specification);
 }