public class Cep implements Serializable {

    private static final long serialVersionUID = 1L;
    @Transient
    private Double uid;
    @Id
    @GeneratedValue
    private long id;
    @Basic(optional = false)
    @Column(name = "CEP", nullable = false, unique = true)
    private String cep;
    private String bairro;
    private String logradouro;
    @Column(name = "tipo_endereco", length = 20)
    private String tipoEndereco;
    @JoinColumn(name = "id_cidade", referencedColumnName = "id", nullable = false)
    @ManyToOne(optional = false, fetch = FetchType.LAZY)
    private IbgeCidade cidade;

    @Column(name = "gia_icms")
    private String giaIcms;

    public Cep() {
        cidade = new IbgeCidade();
        this.uid = Math.random();
    }

#####################################################################################################

public class IbgeCidade implements Serializable {

    private static final long serialVersionUID = 1L;
    @Transient
    private Double uid;
    @Id
    @Basic(optional = false)
    @Column(name = "id", nullable = false)
    @GeneratedValue
    private Integer id;
    @Column(name = "cod_IBGE")
    private Integer codIBGE;
    @Basic(optional = false)
    @Column(name = "nome", nullable = false, length = 255)
    private String nome;
    @Basic(optional = false)
    @Column(name = "tipo_cidade", nullable = false, length = 20)
    private String tipoCidade;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "cidade", fetch = FetchType.LAZY)
    private List<Cep> cepList;
    @JoinColumn(name = "UF", referencedColumnName = "UF", nullable = false)
    @ManyToOne(optional = false, fetch = FetchType.LAZY)
    private Uf uf;

#####################################################################################################

public class Uf implements Serializable {

    private static final long serialVersionUID = 1L;
    @Transient
    private Double uid;
    @Id
    @Basic(optional = false)
    @Column(name = "UF", nullable = false, length = 2)
    private String uf;
    // @Max(value=?)  @Min(value=?)//if you know range of your decimal fields consider using these annotations to enforce field validation
    @Column(name = "aliq_ST", precision = 22)
    private Double aliqST;
    @Basic(optional = false)
    @Column(name = "codigo_IBGE", nullable = false)
    private int codigoIBGE;
    @Column(name = "desconto_venda", precision = 22)
    private Double descontoVenda;
    @Column(name = "ICMS_contribuinte", precision = 22)
    private Double iCMSContribuinte;
    @Column(name = "ICMS_nao_contribuinte", precision = 22)
    private Double iCMSNaoContribuinte;
    @Basic(optional = false)
    @Column(name = "nome", nullable = false)
    private String nome;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "uf", fetch = FetchType.LAZY)
    private List<IbgeCidade> ibgeCidadeList;

    public Uf() {
        this.uid = Math.random();
    }

#####################################################################################################

@Table(name = "endereco")
public class Endereco extends DefaultTimeStamped implements Serializable {

    private static final long serialVersionUID = 1L;
    @Transient
    private Double uid;

    @Id
    @GeneratedValue
    private Long id;
    @JoinColumn(name = "cep_id", referencedColumnName = "id")
    @ManyToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    private Cep cep;
    @Column(name = "compl_endereco")
    private String complEndereco;
    @Column(name = "num_endereco")
    private String numEndereco;
    @Column(name = "tipo_endereco")
    private String tipoEndereco;
    @Column(name = "obs")
    private String observacoes;

    @JoinColumn(name = "id_cliente", referencedColumnName = "id", nullable = false)
    @ManyToOne(optional = false, fetch = FetchType.LAZY, cascade = CascadeType.REFRESH)
    private Cliente cliente;

    public Endereco() {
        this.uid = Math.random();
        cep = new Cep();

    }