[JavaEE] Data Validation

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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:

@Entitypublic 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);    }

 

[JavaEE] Data Validation