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Код

package ru.iamready.action;

import ru.iamready.model.User;

import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.Query;
import javax.persistence.PersistenceContext;
import java.util.List;

import org.hibernate.validator.ClassValidator;
import org.hibernate.validator.InvalidValue;

@Stateless(name = "UserLogin", mappedName = "UserLogin")
public class UserLoginAction implements UserLogin {

    @PersistenceContext
    private EntityManager entityManager;

    private User user;

    @Override
    public void register(String name, String surname) {
        User user = new User();
        user.setName(name);
        user.setSurname(surname);

        ClassValidator validator = new ClassValidator(User.class);
        InvalidValue[] errors = validator.getInvalidValues(user);
        
        entityManager.persist(user);
        entityManager.flush();
    }

    @Override
    public String sayHello(String name) {
        return "Fuck you, " + name;
    }

    @Override
    public List<User> getAllUsers() {
        Query query = entityManager.createQuery("select user from User user");
        return query.getResultList();
    }
}

package ru.iamready.model;


import org.hibernate.validator.Length;
import org.hibernate.validator.NotNull;
import org.hibernate.validator.event.JPAValidateListener;

import javax.persistence.*;
import static javax.persistence.GenerationType.IDENTITY;
import java.io.Serializable;


@Entity
@EntityListeners(JPAValidateListener.class )
@Table(name = "testUser", catalog = "ready")
public class User implements Serializable{
    private Integer id;
    private String name;
    private String surname;

    @Id
    @GeneratedValue(strategy = IDENTITY)
    @Column(name = "id", unique = true, nullable = false)
    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    @Column(name = "name", nullable = false)
    @Length(max = 5)
    @NotNull
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Column(name = "surname", nullable = false)
    @Length(max = 5)
    @NotNull
    public String getSurname() {
        return surname;
    }

    public void setSurname(String surname) {
        this.surname = surname;
    }
}