import javax.jws.WebMethod;
import javax.jws.WebParam;
import javax.jws.WebService;

@WebService(serviceName = "BookManager")
public class BookManager extends PersistentEntityManager<Book> implements BookManagerInterface {

  public BookManager() {
    super(Book.class);
  }

  @WebMethod(operationName = "getBooksList")
  @Override
  public List<BookInformation> getBooksList() {
    List<BookInformation> result = new ArrayList<>();
    
    // ...
    
    return result;
  }

  @WebMethod(operationName = "getBooksListWithStockpile")
  @Override
  public List<BookInformationDetailed> getBooksListWithStockpile(@WebParam(name = "stockpile") int stockpile) {
    List<BookInformationDetailed> result = new ArrayList<>();

    // ...
  
    return result;
  }

}