My Jtable head does not appear

DefaultTableModel tabmod = new DefaultTableModel(new String[]{"No.PO", "No.detail PO", "TglPO", "Nama Compound", "Type", "Warna", "Qty", "part", "Deskripsi", "Keterangan"}, 0);
String sql3 = "select NoPO, NouPO, TglPO, part, Qty from tbl_tmb where sisPart > '0'";
try{
stmt = lpi.createStatement();
rs = stmt.executeQuery(sql3);
while(rs.next()){
String sql4 = "select b.nama, b.type, b.warna, a.Description, a.Ket, c.TglPengiriman from tbl_po_dtl as a left join tbl_daftar_item as b on a.NmBrg=b.id left join tbl_po as c on a.NoPO=c.NoPO where a.NoPO='"+ rs.getString("NoPO") +"' && a.NoUrutPO='"+ rs.getString("NouPO") +"'";
try{
pst = mpi.prepareStatement(sql4);
ls = pst.executeQuery();
while(ls.next()){
String NoPO = rs.getString("NoPO");
String NouPO = rs.getString("NouPO");
String tglPO = ls.getString("TglPengiriman");
String NamCom = ls.getString("nama");
String type = ls.getString("type");
String warna = ls.getString("warna");
String Qty = rs.getString("Qty");
String part = rs.getString("part");
String desk = ls.getString("Description");
String ket = ls.getString("Ket");
tabmod.addRow(new Object[]{NoPO, NouPO, tglPO, NamCom, type, warna, Qty, part, desk, ket});
}
}catch(SQLException e){
System.out.println(e.getMessage());
}
}
}catch(SQLException e){
System.out.println(e.getMessage());
}
tabut = new JTable();
tabut.setModel(tabmod);
tabut.setBounds(10, 70, 1325, 250);

the values are shown, but the header does not appear, what's wrong with my code? please help me.