Question

我正在尝试实现自定义注释，因为它是在post中编写的，但出了点问题。当我试图在dataBase中保存我的实体时，它会使用我的自定义注释进行无限检查。我正在使用wildfly 9.0.2

代码：

实体：

@Entity
@Table(name = "users")
@NamedQueries({
        @NamedQuery(name = User.FIND_BY_LOGIN_AND_USERNAME,query = "SELECT u FROM User u WHERE u.userName = :username and u.password = :password"),
        @NamedQuery(name = User.FIND_USER_BY_USERNAME,query = "SELECT u FROM User u WHERE u.userName = :username")
})
public class User implements Serializable{

    public static final String FIND_BY_LOGIN_AND_USERNAME = "findByLoginAndPassword";
    public static final String FIND_USER_BY_USERNAME = "findUserByUsername";

    @Id
    @GeneratedValue
    private Long id;
    @NotNull
    @Size(min = 3,max = 64,message = "{model.User.login.message}")
    @Username
    @Column(name = "user_name",nullable = false,unique = true)
    private String userName;

    //...other fields...

    //...constructors, getters and setters...
}

注释：

@Constraint(validatedBy = UsernameValidator.class)
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD,ElementType.METHOD,ElementType.ANNOTATION_TYPE})
public @interface Username {
    String message() default "Username already exists";
    Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};
}

验证

public class UsernameValidator implements ConstraintValidator<Username, String> {

    @Inject
    UserManager userManager;

    @Override
    public void initialize(Username constraintAnnotation) {

    }

    @Override
    public boolean isValid(String username, ConstraintValidatorContext context) {
        boolean isValid = !userManager.userExist(username);
        return isValid;
    }
}

的UserManager：

@Stateless
public class UserManager {

    @PersistenceContext(unitName = "MySqlPU")
    EntityManager em;

    public void persist(User user){
        em.persist(user);
    }

    public User findUserByLoginAndPassword(String username, String password) {
        try {
            return em.createNamedQuery(User.FIND_BY_LOGIN_AND_USERNAME, User.class)
                    .setParameter("username",username)
                    .setParameter("password",password)
                    .getSingleResult();
        } catch (NoResultException e){
            return null;
        }
    }

    public boolean userExist(String username) {
        try {
            em.createNamedQuery(User.FIND_USER_BY_USERNAME, User.class)
                    .setParameter("username", username)
                    .getSingleResult();
        } catch (NoResultException e) {
            return false;
        }
        return true;
    }
}

链接到server.log（snip2code）

提前谢谢！

Answer 1

所以问题是，当我从验证器调用userExist(String username)时，它需要父事务以及@maress如何说，转到无限循环。我通过在userExist方法禁用事务来解决此问题。所以现在使用此更改代码将起作用

    @TransactionAttribute(TransactionAttributeType.NOT_SUPPORTED)
    public boolean userExist(String username) {
        try {
            em.createNamedQuery(User.FIND_USER_BY_USERNAME, User.class)
                    .setParameter("username", username)
                    .getSingleResult();
        } catch (NoResultException e) {
            return false;
        }
        return true;
    }

无限制检查自定义JSR303注释

1 个答案: