/***
 * Excerpted from "Domain-Driven Design Using Naked Objects",
 * published by The Pragmatic Bookshelf.
 * Copyrights apply to this code. It may not be used to create training material, 
 * courses, books, articles, and the like. Contact us if you are in doubt.
 * We make no guarantees that this code is fit for any purpose. 
 * Visit http://www.pragmaticprogrammer.com/titles/dhnako for more book information.
***/
protected Customer findCustomer(
        final String lastName, final String firstName) {
    List<Customer> customers = 
        customerRepository.findByName(lastName, firstName);
    return customers.size() > 0 ? customers.get(0): null;
}
private CustomerRepository customerRepository;
public void setCustomerRepository(
        final CustomerRepository customerRepository) {
    this.customerRepository = customerRepository;
}
