Spring Security + Hibernate. Подскажите пожалуйста, в чем может быть ошибка

package ru.testhf.srv3.h37945.domain;
 
 
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
 
@Entity
@Table(name="Users")
public class UserDB {
    @Id
    @Column
    private String login;
    @Column
    private String password;
    @Column
    private String role;
 
    public UserDB() {
    }
 
    public String getLogin() {
        return login;
    }
 
    public void setLogin(String login) {
        this.login = login;
    }
 
    public String getPassword() {
        return password;
    }
 
    public void setPassword(String password) {
        this.password = password;
    }
 
    public String getRole() {
        return role;
    }
 
    public void setRole(String role) {
        this.role = role;
    }
}

package ru.testhf.srv3.h37945.domain;
 
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;
 
import java.util.Collection;
import java.util.HashSet;
 
public class User implements UserDetails{
    private String username;
    private String password;
    private Collection<GrantedAuthority> authorities;
 
    public User(String username, String password, String roles) {
        super();
        this.username = username;
        this.password = password;
        this.setAuthorities(roles);
    }
 
    public void setAuthorities(String roles) {
        this.authorities = new HashSet<GrantedAuthority>();
        for (final String role : roles.split(",")) {
            if (role != null && !"".equals(role.trim())) {
                GrantedAuthority grandAuthority = new GrantedAuthority() {
 
                    public String getAuthority() {
                        return role.trim();
                    }
                };
                this.authorities.add(grandAuthority);
            }
        }
    }
 
    public void setUsername(String username) {
        this.username = username;
    }
 
    public void setPassword(String password) {
        this.password = password;
    }
 
    @Override
    public Collection<? extends GrantedAuthority> getAuthorities() {
        return this.authorities;
    }
 
    @Override
    public String getPassword() {
        return password;
    }
 
    @Override
    public String getUsername() {
        return username;
    }
 
    @Override
    public boolean isAccountNonExpired() {
        return true;
    }
 
    @Override
    public boolean isAccountNonLocked() {
        return true;
    }
 
    @Override
    public boolean isCredentialsNonExpired() {
        return true;
    }
 
    @Override
    public boolean isEnabled() {
        return true;
    }
}

package ru.testhf.srv3.h37945.service;
 
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Service;
 
import ru.testhf.srv3.h37945.domain.User;
import ru.testhf.srv3.h37945.domain.UserDB;
 
@Service
public class UserManager {
 
    public UserManager() {
    }
 
    public User getUser(String username) throws UsernameNotFoundException {
        SessionFactory sessionFactory = new Configuration().buildSessionFactory();
        Session session = sessionFactory.getCurrentSession();
        Transaction transaction = session.beginTransaction();
        UserDB userDB = (UserDB) session.get(UserDB.class, username);
        transaction.commit();
        return new User(userDB.getLogin(), userDB.getPassword(), userDB.getRole());
 
    }
}