Question

I have problem with my program.
I have 2 table with one to many relation.

In one record in table “A” which be references key in table “B”;

How i can input record in table “B”.
Thanks

Model for table A

@Entity
@Table(name = "muatan_ktsp", catalog = "bansm", schema = "public")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "MuatanKtsp.findAll", query = "SELECT m FROM MuatanKtsp m"),
    @NamedQuery(name = "MuatanKtsp.findByMuatanKtspDate", query = "SELECT m FROM MuatanKtsp m WHERE m.muatanKtspDate = :muatanKtspDate"),
    @NamedQuery(name = "MuatanKtsp.findByMuatanKtspTime", query = "SELECT m FROM MuatanKtsp m WHERE m.muatanKtspTime = :muatanKtspTime"),
    @NamedQuery(name = "MuatanKtsp.findByOrderDateDESC", query = "SELECT m FROM MuatanKtsp m ORDER BY m.muatanKtspDate DESC")})
public class MuatanKtsp implements Serializable {

    @Column(name =     "muatan_ktsp_date",insertable = false)
    @Temporal(TemporalType.DATE)
    private Date muatanKtspDate;
    @Column(name =     "muatan_ktsp_time",insertable = false)
    @Temporal(TemporalType.TIME)
    private Date muatanKtspTime;

    @OneToMany(cascade = CascadeType.ALL,mappedBy = "muatanKtspId")
    private List<Penjurusan> penjurusanCollection;
    @OneToMany(cascade = CascadeType.ALL,mappedBy = "muatanKtspId")
    private List<PengaturanBebanBelajar> pengaturanBebanBelajarCollection;
    @OneToMany(cascade = CascadeType.ALL,mappedBy = "muatanKtspId")
    private List<PendidikanKecakapanHidup> pendidikanKecakapanHidupCollection;
    @OneToMany(cascade = CascadeType.ALL,mappedBy = "muatanKtspId")
    private List<PendidikanGlobalLokal> pendidikanGlobalLokalCollection;
    @OneToMany(cascade = CascadeType.ALL,mappedBy = "muatanKtspId")
    private List<MuatanLokal> muatanLokalCollection;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "muatanKtspId")
    private List<MataPelajaran> mataPelajaranCollection;
    @OneToMany(cascade = CascadeType.ALL,mappedBy = "muatanKtspId")
    private List<KriteriaKenaikanKelas> kriteriaKenaikanKelasCollection;
    @OneToMany(cascade = CascadeType.ALL,mappedBy = "muatanKtspId")
    private List<KriteriaKelulusan> kriteriaKelulusanCollection;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "muatanKtspId")
    private List<KegiatanPengembanganDiri> kegiatanPengembanganDiriCollection;
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(generator = "system-uuid")
    @GenericGenerator(name = "system-uuid", strategy = "uuid")
    @Column(name = "muatan_ktsp_id", unique = true)
    private String muatanKtspId;

    public MuatanKtsp() {
    }

    public MuatanKtsp(String muatanKtspId) {
        this.muatanKtspId = muatanKtspId;
    }

    public Object getMuatanKtspId() {
        return muatanKtspId;
    }

    public void setMuatanKtspId(String muatanKtspId) {
        this.muatanKtspId = muatanKtspId;
    }

    public Date getMuatanKtspDate() {
        return muatanKtspDate;
    }

    public void setMuatanKtspDate(Date muatanKtspDate) {
        this.muatanKtspDate = muatanKtspDate;
    }

    public Date getMuatanKtspTime() {
        return muatanKtspTime;
    }

    public void setMuatanKtspTime(Date muatanKtspTime) {
        this.muatanKtspTime = muatanKtspTime;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        hash += (muatanKtspId != null ? muatanKtspId.hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object object) {
        // TODO: Warning - this method won't work in the case the id fields are not set
        if (!(object instanceof MuatanKtsp)) {
            return false;
        }
        MuatanKtsp other = (MuatanKtsp) object;
        if ((this.muatanKtspId == null && other.muatanKtspId != null) || (this.muatanKtspId != null && !this.muatanKtspId.equals(other.muatanKtspId))) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return "bansm.model.MuatanKtsp[ muatanKtspId=" + muatanKtspId + " ]";
    }

    @XmlTransient
    public List<KegiatanPengembanganDiri> getKegiatanPengembanganDiriCollection() {
        return kegiatanPengembanganDiriCollection;
    }

    public void setKegiatanPengembanganDiriCollection(List<KegiatanPengembanganDiri> kegiatanPengembanganDiriCollection) {
        this.kegiatanPengembanganDiriCollection = kegiatanPengembanganDiriCollection;
    }

    @XmlTransient
    public List<KriteriaKelulusan> getKriteriaKelulusanCollection() {
        return kriteriaKelulusanCollection;
    }

    public void setKriteriaKelulusanCollection(List<KriteriaKelulusan> kriteriaKelulusanCollection) {
        this.kriteriaKelulusanCollection = kriteriaKelulusanCollection;
    }

    @XmlTransient
    public List<KriteriaKenaikanKelas> getKriteriaKenaikanKelasCollection() {
        return kriteriaKenaikanKelasCollection;
    }

    public void setKriteriaKenaikanKelasCollection(List<KriteriaKenaikanKelas> kriteriaKenaikanKelasCollection) {
        this.kriteriaKenaikanKelasCollection = kriteriaKenaikanKelasCollection;
    }

    @XmlTransient
    public List<MataPelajaran> getMataPelajaranCollection() {
        return mataPelajaranCollection;
    }

    public void setMataPelajaranCollection(List<MataPelajaran> mataPelajaranCollection) {
        this.mataPelajaranCollection = mataPelajaranCollection;
    }

    @XmlTransient
    public List<MuatanLokal> getMuatanLokalCollection() {
        return muatanLokalCollection;
    }

    public void setMuatanLokalCollection(List<MuatanLokal> muatanLokalCollection) {
        this.muatanLokalCollection = muatanLokalCollection;
    }

    @XmlTransient
    public List<PendidikanGlobalLokal> getPendidikanGlobalLokalCollection() {
        return pendidikanGlobalLokalCollection;
    }

    public void setPendidikanGlobalLokalCollection(List<PendidikanGlobalLokal> pendidikanGlobalLokalCollection) {
        this.pendidikanGlobalLokalCollection = pendidikanGlobalLokalCollection;
    }

    @XmlTransient
    public List<PendidikanKecakapanHidup> getPendidikanKecakapanHidupCollection() {
        return pendidikanKecakapanHidupCollection;
    }

    public void setPendidikanKecakapanHidupCollection(List<PendidikanKecakapanHidup> pendidikanKecakapanHidupCollection) {
        this.pendidikanKecakapanHidupCollection = pendidikanKecakapanHidupCollection;
    }

    @XmlTransient
    public List<PengaturanBebanBelajar> getPengaturanBebanBelajarCollection() {
        return pengaturanBebanBelajarCollection;
    }

    public void setPengaturanBebanBelajarCollection(List<PengaturanBebanBelajar> pengaturanBebanBelajarCollection) {
        this.pengaturanBebanBelajarCollection = pengaturanBebanBelajarCollection;
    }

    @XmlTransient
    public List<Penjurusan> getPenjurusanCollection() {
        return penjurusanCollection;
    }

    public void setPenjurusanCollection(List<Penjurusan> penjurusanCollection) {
        this.penjurusanCollection = penjurusanCollection;
    }

Model for table B

 @Entity
@Table(name = "mata_pelajaran", catalog = "bansm", schema = "public")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "MataPelajaran.findAll", query = "SELECT m FROM MataPelajaran m"),
    @NamedQuery(name = "MataPelajaran.findByMataPelajaran", query = "SELECT m FROM MataPelajaran m WHERE m.mataPelajaran = :mataPelajaran"),
    @NamedQuery(name = "MataPelajaran.findByKkm", query = "SELECT m FROM MataPelajaran m WHERE m.kkm = :kkm"),
    @NamedQuery(name = "MataPelajaran.findByMataPelajaranId", query = "SELECT m FROM MataPelajaran m WHERE m.mataPelajaranId = :mataPelajaranId")})
public class MataPelajaran implements Serializable {
    private static final long serialVersionUID = 1L;
    @Basic(optional = false)
    @Column(name = "mata_pelajaran")
    private String mataPelajaran;
    // @Max(value=?)  @Min(value=?)//if you know range of your decimal fields consider using these annotations to enforce field validation
    @Column(name = "kkm", precision = 17, scale = 17)
    private Double kkm;

    @Id
    @GeneratedValue(generator = "system-uuid")
    @GenericGenerator(name = "system-uuid", strategy = "uuid")
    @Column(name = "mata_pelajaran_id", unique=true)
    private String mataPelajaranId;
    @JoinColumn(name = "muatan_ktsp_id", referencedColumnName = "muatan_ktsp_id")
    @ManyToOne
    private MuatanKtsp muatanKtspId;

    public MataPelajaran() {
    }

    public MataPelajaran(String mataPelajaranId) {
        this.mataPelajaranId = mataPelajaranId;
    }

    public MataPelajaran(String mataPelajaranId, String mataPelajaran) {
        this.mataPelajaranId = mataPelajaranId;
        this.mataPelajaran = mataPelajaran;
    }

    public String getMataPelajaran() {
        return mataPelajaran;
    }

    public void setMataPelajaran(String mataPelajaran) {
        this.mataPelajaran = mataPelajaran;
    }

    public Double getKkm() {
        return kkm;
    }

    public void setKkm(Double kkm) {
        this.kkm = kkm;
    }

    public String getMataPelajaranId() {
        return mataPelajaranId;
    }

    public void setMataPelajaranId(String mataPelajaranId) {
        this.mataPelajaranId = mataPelajaranId;
    }

    public MuatanKtsp getMuatanKtspId() {
        return muatanKtspId;
    }

    public void setMuatanKtspId(MuatanKtsp muatanKtspId) {
        this.muatanKtspId = muatanKtspId;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        hash += (mataPelajaranId != null ? mataPelajaranId.hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object object) {
        // TODO: Warning - this method won't work in the case the id fields are not set
        if (!(object instanceof MataPelajaran)) {
            return false;
        }
        MataPelajaran other = (MataPelajaran) object;
        if ((this.mataPelajaranId == null && other.mataPelajaranId != null) || (this.mataPelajaranId != null && !this.mataPelajaranId.equals(other.mataPelajaranId))) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return "bansm.model.MataPelajaran[ mataPelajaranId=" + mataPelajaranId + " ]";
    }

}

Answer 1

You should persist not owner side entity first and then persist owner side entity. According to your codes, you should persist MuatanKtsp entity first. See this example.It may be reference for you.