// adding this configuration adds the styles and the painters to use
natTable.addConfiguration(new DefaultNatTableStyleConfiguration());
natTable.addConfiguration(new AbstractRegistryConfiguration() {
@Override
public void configureRegistry(IConfigRegistry configRegistry) {
PoiExcelExporter exporter = new HSSFExcelExporter();
exporter.setApplyVerticalTextConfiguration(true);
exporter.setApplyBackgroundColor(false);
configRegistry.registerConfigAttribute(
ExportConfigAttributes.EXPORTER, exporter);
configRegistry.registerConfigAttribute(
ExportConfigAttributes.DATE_FORMAT, "dd.MM.yyyy");