try{ DBUtil db = new DBUtil(); String requeteSelect ="select * from DOC_XML where Numero='"+txt_num.getText()+"' or Date= '"+date.getDate()+"'"+"' or Nom= '"+cbx_typ.getSelectedItem().toString()+"'"; ResultSet Rs = db.consulter(requeteSelect); } catch(NullPointerException e){ JOptionPane.showMessageDialog(null, "Attention, la combobox est vide"); }