java.lang.ArrayStoreException

[NicoDevX]

Describe the bug

When exporting a CSV from a Grid we receive a java.lang.ArrayStoreException: null. There is no other stacktrace available

Expected behavior

CSV should be work like Excel, Word, PDF which are working fine.

Minimal reproducible example

GridExporter<ItemRecord> exporter = GridExporter.createFor(grid); exporter.setExportColumn(grid.getColumnByKey("Pos"), true); exporter.setExportColumn(grid.getColumnByKey("Artnr"), true); exporter.setExportColumn(grid.getColumnByKey("Artikelbezeichnung"), true); exporter.setExportColumn(grid.getColumnByKey("Menge"), true); exporter.setExportColumn(grid.getColumnByKey("Preis"), true); exporter.setExportColumn(grid.getColumnByKey("Status"), false); HashMap<String, String> placeholders = new HashMap<>(); placeholders.put("${date}", new SimpleDateFormat().format(Calendar.getInstance().getTime())); exporter.setAdditionalPlaceHolders(placeholders); exporter.setTitle("Tabelle"); exporter.setFileName("Tabelle" + new SimpleDateFormat("yyyyddMM").format(Calendar.getInstance().getTime()));

Add-on Version

2.5.1

Vaadin Version

24.6.7

Additional information

The Type in List are records. Maybe this is a problem? But Word etc works with that setup

[javier-godoy]

Confirmed. This is a regression from #154 because CsvStreamResourceWriter was not adjusted after this change.

-List<Pair<String, Column<T>>> getGridHeaders(Grid<T> grid)
+List<Pair<List<String>, Column<T>>> getGridHeaders(Grid<T> grid)

It breaks in

GridExporterAddon/src/main/java/com/flowingcode/vaadin/addons/gridexporter/CsvStreamResourceWriter.java

Line 64 in e0362ab

headers = getGridHeaders(grid).stream().map(Pair::getLeft).toArray(String[]::new);