public class Licenca  implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @Basic(optional = false)
    @GeneratedValue
    @Column(name = "id", nullable = false)
    private Long id;
    @Temporal(TemporalType.TIMESTAMP)
    @Column(name = "data_fundacao")
    private Date dataFundacao;
    @ManyToMany(mappedBy = "licencas", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    @Fetch(FetchMode.SUBSELECT)
    private List<UsuarioLicenca> usuarioLicencas = new ArrayList<>();
}


public class UsuarioLicenca implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @Basic(optional = false)
    @GeneratedValue
    @Column(name = "id", nullable = false)
    private Long id;
    @ManyToMany(mappedBy = "usuarioLicencas", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    private List<Licenca> licencas;
    @Column(name = "uid_certificado", nullable = false)
    private String UIDCertificado;
    @Column(name = "seria_certificado", nullable = false)
    private String serialCertificado;
    @Column(name = "num_acessos", nullable = false)
    private Integer numeroAcessos;
}