package net.proselyte.springsecurityapp.model;
//Simple JavaBean object that represents role of {@link User}
import org.springframework.security.core.userdetails.User;
import javax.persistence.*;
import java.util.Set;

@Entity //сущность
@Table(name = "roles")
public class Role {

    @Id //данное поле является idишником
    @GeneratedValue (strategy = GenerationType.AUTO) //генерируемое значение
    private long id;
    @Column(name = "name") // колонка имени
    private String name;

    @ManyToMany(mappedBy = "roles")
    private Set<User> users;

    public Role(){

    }

    public long getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public Set<User> getUsers() {
        return users;
    }

    public void setUsers(Set<User> users) {
        this.users = users;
    }

    @Override
    public String toString() {
        return "Role{" +
                "id=" + id +
                ", name='" + name + ''' +
                ", users=" + users +
                '}';
    }
}

package net.proselyte.springsecurityapp.model;
// Simple JavaBean domain object that represents a User


import net.proselyte.springsecurityapp.model.Role;

import javax.persistence.*;
import java.util.Set;

@Entity
@Table(name = "users")
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @Column(name ="username")
    private String username;

    @Column(name = "password")
    private String password;

    @Transient
    transient private String confirmPassword; // для подтверждения пароля при регистрации
    @JoinTable(name = "user_roles", joinColumns = @JoinColumn(name = "user_id"),
            inverseJoinColumns = @JoinColumn(name = "roles_id"))
    private Set<Role> roles;

    public Long getId() {
        return id;
    }

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

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getConfirmPassword() {
        return confirmPassword;
    }

    public void setConfirmPassword(String confirmPassword) {
        this.confirmPassword = confirmPassword;
    }

    public Set<Role> getRoles() {
        return roles;
    }

    public void setRoles(Set<Role> roles) {
        this.roles = roles;
    }
}

package net.proselyte.springsecurityapp.Service;

    import org.springframework.security.core.userdetails.User;

    // Service class for User
    public interface UserService {

        void save(User user);

        User findByUsername(String username);
    }


Класс UserServiceImpl

package net.proselyte.springsecurityapp.Service;
// Implementation of UserService interface


import net.proselyte.springsecurityapp.model.Role;
import net.proselyte.springsecurityapp.dao.RoleDao;
import net.proselyte.springsecurityapp.dao.UserDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.userdetails.User;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.stereotype.Service;

import java.util.HashSet;
import java.util.Set;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserDao userDao;

    @Autowired
    private RoleDao roleDao;

    @Autowired
    BCryptPasswordEncoder bCryptPasswordEncoder;


    @Override
    public void save(User user) {
        user.setPassword(bCryptPasswordEncoder.encode(user.getPassword()));
        Set<Role> roles = new HashSet<>();
        roles.add(roleDao.getOne(1L));
        user.setRoles(roles);
        userDao.save(user);

    }

    @Override
    public User findByUsername(String username) {
        return null;
    }
}

package net.proselyte.springsecurityapp.Service;
// Implementation of UserService interface


        import net.proselyte.springsecurityapp.model.Role;
        import net.proselyte.springsecurityapp.dao.RoleDao;
        import net.proselyte.springsecurityapp.dao.UserDao;
        import org.springframework.beans.factory.annotation.Autowired;
        import org.springframework.security.core.userdetails.User;
        import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
        import org.springframework.stereotype.Service;

        import java.util.HashSet;
        import java.util.Set;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserDao userDao;

    @Autowired
    private RoleDao roleDao;

    @Autowired
    BCryptPasswordEncoder bCryptPasswordEncoder;


    @Override
    public void save(User user) {
        user.setPassword(bCryptPasswordEncoder.encode(user.getPassword()));
        Set<Role> roles = new HashSet<>();
        roles.add(roleDao.getOne(1L));
        user.setRoles(roles);
        userDao.save(user);

    }

    @Override
    public User findByUsername(String username) {
        return null;
    }
}