Local variables referred from inner class must be

Please have a look at the below code

private void displayInitialRevenue_Method() {
    //Get the dates from the combo
    String selectedCouple = revenueYearCombo.getSelectedItem().toString();
    if (selectedCouple.equals("Select Year")) {
        return;
    }
    String[] split = selectedCouple.split("/");
    //Related to DB
    double totalAmount = 0.0;
    //Get data from the database
    dbConnector = new DBHandler();
    dbConnector.makeConnection();
    DefaultTableModel model = (DefaultTableModel) initialRevenueTable.getModel();
    model.setRowCount(0);
    ResultSet selectAllDetails = dbConnector.selectAllDetails("SQL CODE ");
    try {
        if (selectAllDetails.isBeforeFirst() == false) {
            JOptionPane.showMessageDialog(null, "This table is empty");
        } else {
            while (selectAllDetails.next()) {
                String clientName = selectAllDetails.getString("Client Name");
                String providerName = selectAllDetails.getString("Provider Name");
                Double amountInvested = selectAllDetails.getDouble("Invest_Amount");
                //Update the table
                SwingUtilities.invokeLater(new Runnable() {
                    public void run() {
                        Object[] row = {clientName, providerName, amountInvested};
                        model.addRow(row);
                    }
                });
                //Get the total
                totalAmount = totalAmount + amountInvested;
            }
            //Add the sum
            SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                    Object[] blankRow = {null};
                    model.addRow(blankRow);
                    Object[] row = {totalAmount};
                    model.addRow(row);

                }
            });
        }
    } catch (SQLException sql) {
        JOptionPane.showMessageDialog(null, sql.getLocalizedMessage());
    }
}

This entire method is running inside another thread. The UI updates are running inside SwingUtilities.InvokeLater(). However pls put attention to the below.

Object[]row = {totalAmount};
model.addRow(row);

The variable totalAmount is not final and it cannot be final because it need to be calculated in the above while loop. Since it is not final I am unable to use it inside the SwingUtilities.InvokeLater() as the error says Local variables referred from inner class must be final or effectively final

You can make an additional variable that is Final and then copy the final result of the calculation into it.

while (selectAllDetails.next()) {
            String clientName = selectAllDetails.getString("Client Name");
            String providerName = selectAllDetails.getString("Provider Name");
            Double amountInvested = selectAllDetails.getDouble("Invest_Amount");
            //Update the table
            SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                    Object[] row = {clientName, providerName, amountInvested};
                    model.addRow(row);
                }
            });
            //Get the total
            totalAmount = totalAmount + amountInvested;
        }
final Double totalAmountInvested = totalAmount; // and now use this one in the Inner