Getting Started with Spring Data JPA - Spring Data - page 32

Contact contact = Contact.getBuilder(added.getFirstName(), added.
getLastName())
.address(added.getStreetAddress(), added.getPostCode(),
added.getPostOffice(), added.getState(), added.getCountry())
.emailAddress(added.getEmailAddress())
.phoneNumber(added.getPhoneNumber())
.build();
return repository.save(contact);
}

Read
Our application has to provide a list of all contacts and the information of a single
contact to its user. The ContactService interface declares two methods, which are
relevant to these use cases. These methods are: findAll() and findById() .

Our implementation of the findAll() method is fairly simple. We simply delegate
the method call forward to the repository. The source code of the findAll() method
is given as follows:

@Transactional(readOnly = true)
@Override
public List<Contact> findAll() {
return repository.findAll();
}

Now we have to create an implementation of the findById() method. Our
implementation contains the following steps:

1. Find the contact by calling our repository's findOne() method.

2. If no contact is found, throw a NotFoundException .

3. Return the found contact.

The source code of the findById() method is given as follows:

@Transactional(readOnly = true)
@Override
public Contact findById(Long id) throws NotFoundException {
Contact found = repository.findOne(id);

if (found == null) {
throw new NotFoundException("No contact found with id: " +
id);