Hibernate - Reversa

CREATE TABLE users (
	username VARCHAR(50) NOT NULL PRIMARY KEY,
	password VARCHAR(50) NOT NULL,
	enabled BIT NOT NULL
);

CREATE TABLE authorities (
	username VARCHAR(50) NOT NULL,
	authority VARCHAR(50) NOT NULL
);
CREATE UNIQUE INDEX ix_auth_username ON authorities ( username, authority );

ALTER TABLE authorities ADD CONSTRAINT fk_authorities_users foreign key (username) REFERENCES users(username);

@Entity
@Table(name="users")
public class Users implements Serializable{
	private static final long serialVersionUID = 1L;
	
	private String username;
	private String password;
	private Boolean enabled;
	private Authorities auth;
	
	@OneToOne(mappedBy="user")
	public Authorities getAuth() {
		return auth;
	}
	public void setAuth(Authorities auth) {
		this.auth = auth;
	}
	@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 Boolean getEnabled() {
		return enabled;
	}
	public void setEnabled(Boolean enabled) {
		this.enabled = enabled;
	}
}

@Entity
@Table(name="authorities")
public class Authorities implements Serializable{
	private static final long serialVersionUID = 1L;
	
	private AuthoritiesPK pk;
	
	@EmbeddedId
	public AuthoritiesPK getPk() {
		return pk;
	}
	public void setPk(AuthoritiesPK pk) {
		this.pk = pk;
	}	
}

@Embeddable
public class AuthoritiesPK implements Serializable{
	private static final long serialVersionUID = 1L;
	
	private Users user;
	private String authority;
	
	@OneToOne
	@JoinColumn(name="username")
	public Users getUser() {
		return user;
	}
	public void setUser(Users user) {
		this.user = user;
	}
	
	public String getAuthority() {
		return authority;
	}
	public void setAuthority(String authority) {
		this.authority = authority;
	}	
}