AbstractDataTable fireTableDataChanged() does not refresh jtable

Question

I am having difficulties while adding data to my jtable. It first loads the data from collection, with a jtextfield I add a new data, certainly data is added in collection debug

Answer 1

This method is not well implemented:

public void insertData(String values) {
    vehicleService.createVehicleType(values);
    fireTableDataChanged(); // No, call fireTableRowsInserted(...) instead
    ...
}

Calling fireTableDateChanged() is excesive and unnecessary at this point since you seem to add a single row to your table. The correct implementation should call fireTableRowsInserted(int firstRow, int lastRow) as follows:

public void insertData(String values) {
    vehicleService.createVehicleType(values);
    int lastIndex = vehicleService.retrieveVehicleTypes().size() - 1;
    fireTableRowsInserted(lastIndex, lastIndex); // first and last indices are the same
}

In addition there's no need to revalidate() nor repaint() nothing after adding new rows to the table model. Simply notifying the listeners is enough: the JTable is a listener of its own model and will repaint itself accordingly on TableModelEvents.