[JavaEE] Data Validation

When we create Entity and Respority, we also need to do validations to protect our data.

In Java, validations are built-in, using decorators. For Typescript, found a useful libaray to do the similar validation as well. Checkout class-validator

Entity:

@Entity

public class Book {

    // ======================================

    // =             Attributes             =

    // ======================================

    @Id

    @GeneratedValue

    private Long id;

    @Column(length = 200)

    @NotNull

    @Size(min = 1, max = 200)

    private String title;

    @Column(length = 10000)

    @Size(min = 1, max = 10000)

    private String description;

    @Column(name = "unit_cost")

    @Min(1)

    private Float unitCost;

    @Column(length = 50)

    @NotNull

    @Size(min = 1, max = 50)

    private String isbn;

    @Column(name = "publication_date")

    @Temporal(TemporalType.DATE)

    @Past

    private Date publicationDate;

    ....

}

Testing:

We want to test, if we give title as null, it should throw exception.

@RunWith(Arquillian.class)

public class BookRepositoryTest {

    @Inject

    private BookRepository bookRepository;

    // We want the test throw exception

    @Test(expected = Exception.class)

    public void createInvalidBook() {

        Book book = new Book("isbn", null, 12F, 123, Language.ENGLISH, new Date(), "imageURL", "description");

        bookRepository.create(book);

    }

    @Deployment

    public static JavaArchive createDeployment() {

        return ShrinkWrap.create(JavaArchive.class)

                .addClass(BookRepository.class)

                .addClass(Book.class)

                .addClass(Language.class)

                .addAsManifestResource(EmptyAsset.INSTANCE, "beans.xml")

                .addAsManifestResource("META-INF/test-persistence.xml", "persistence.xml");

    }

    @org.junit.Test

    public void create() {

    }

}

Respority:

@Transactional(SUPPORTS)

public class BookRepository {

    // ======================================

    // =          Injection Points          =

    // ======================================

    @PersistenceContext(unitName = "bookStorePU")

    private EntityManager em;

    // ======================================

    // =          Business methods          =

    // ======================================

    public Book find(@NotNull Long id) {

        return em.find(Book.class, id);

    }

    // For creating and deleting methods, we want to use REQUIRED

    @Transactional(REQUIRED)

    public Book create(@NotNull Book book) {

        em.persist(book);

        return book;

    }

}

Testing:

    @Test(expected = Exception.class)

    public void findWithInvalidId() {

        bookRepository.find(null);

    }

巴特西

[JavaEE] Data Validation

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