jTable Clear All Rows

        clear(); // clear crm contacts
        DefaultTableModel dtm = (DefaultTableModel) jTable_Contact.getModel();
        dtm.setRowCount(0);

Java Oracle Get Generated Key

 ResultSet result = null;
                                   java.sql.Statement pst = conn.createStatement();
                           
                            pst.executeUpdate("INSERT INTO sales_cust_branch (branch_code,debtor_no, br_name, branch_ref, br_address, area, area_details, salesman, sales_man_details, contact_name, default_inventory_location, inv_loc_details, tax_group_id, tax_group_details, sales_account, sales_discount_account,receivables_account, payment_discount_account, sales_account_details, sales_discount_acc_details, receivables_account_details, payment_discount_acc_details, default_ship_via, default_ship_via_details, disable_trans,br_post_address, group_no, group_details, notes, inactive ,company_id, user_id, login_ip,insert_date,pc_user) VALUES "
                                               + "(SALES_DEBTORS_BRANCH.nextval,'"+ debator_no + "','"  + Branch_Name+ "','"  + Branch_Short_Name + "','"  + Billing_Add + "','"  + Sales_Area + "','"  + Sales_Area_Details + "','"  + Sales_Person + "','"  + Sales_Person_Details + "','"  + Contact_Person + "','"  + Def_Inv_Loc + "','"  + Def_Inv_Loc_Details + "','"  + Tax_Group + "','"  + Tax_Group_Details + "','"  + Sales_Ac_Id + "','"  + Sales_Dis_Id + "','"  + Sales_Rcv_Id + "','"  + Sales_Py_Dis_Id + "','"  + Sales_Account + "','"  + Sales_Discount_Account + "','"  + Accounts_Receiveable_Account + "','"  + Promot_Payment_Discount_Account + "','"  + Def_Ship_Com + "','"  +  Def_Ship_Com_Details+ "','"  + 0 + "','"  + Mailing_Add + "','"  +  Sales_Group_Id+ "','"  + Sales_Group_Details + "','"  + Br_General_Notes + "','"  + I_S_Br + "','"  + Dashboard.company_id + "','"  + Dashboard.user_id + "','"  + u.Get_Ip() + "',TO_DATE('"  + u.todays_datetime()+ "', 'yyyy-mm-dd hh24:mi:ss'),'"  + System.getProperty("user.name") + "')", new String [] {"branch_code"});

                            result = pst.getGeneratedKeys();
                            result.next();
                            branch_id = String.valueOf(result.getLong(1));

 System.out.println(branch_id );

Result: 25