#728 - fix access to request attributes:

Due to changes in spring boot 3 request attributes are no longer exposed to freemarker. Therefore, all needed attributes must be copied to model attributes

BudgetMasterServer/src/main/java/de/deadlocker8/budgetmaster/transactions/TransactionImportController.java

@@ -79,10 +79,11 @@ public class TransactionImportController extends BaseController
 	{
 		request.removeAttribute(RequestAttributeNames.CURRENT_CSV_TRANSACTION, RequestAttributes.SCOPE_SESSION);
 
-		if(request.getAttribute(RequestAttributeNames.CSV_IMPORT, RequestAttributes.SCOPE_SESSION) == null)
-		{
-			model.addAttribute(RequestAttributeNames.CSV_IMPORT, new CsvImport(null, ";", StandardCharsets.UTF_8.name(), 0));
-		}
+		// copy session attributes to model, otherwise they are not available in freemarker
+		fillModelAttributeFromRequestSessionOrDefault(model, RequestAttributeNames.CSV_IMPORT, request, new CsvImport(null, ";", StandardCharsets.UTF_8.name(), 0));
+		fillModelAttributeFromRequestSession(model, RequestAttributeNames.CSV_ROWS, request);
+		fillModelAttributeFromRequestSession(model, RequestAttributeNames.CSV_TRANSACTIONS, request);
+		fillModelAttributeFromRequestSession(model, RequestAttributeNames.ERRORS_COLUMN_SETTINGS, request);
 
 		final Object bindingResult = request.getAttribute(RequestAttributeNames.ERROR_UPLOAD, RequestAttributes.SCOPE_SESSION);
 		if(bindingResult != null)
@@ -97,6 +98,28 @@ public class TransactionImportController extends BaseController
 		return ReturnValues.TRANSACTION_IMPORT;
 	}
 
+	private void fillModelAttributeFromRequestSessionOrDefault(Model model, String attributeName, WebRequest request, Object defaultValue)
+	{
+		final Object attribute = request.getAttribute(attributeName, RequestAttributes.SCOPE_SESSION);
+		if(attribute == null)
+		{
+			model.addAttribute(attributeName, defaultValue);
+		}
+		else
+		{
+			model.addAttribute(attributeName, attribute);
+		}
+	}
+
+	private void fillModelAttributeFromRequestSession(Model model, String attributeName, WebRequest request)
+	{
+		final Object attribute = request.getAttribute(attributeName, RequestAttributes.SCOPE_SESSION);
+		if(attribute != null)
+		{
+			model.addAttribute(attributeName, attribute);
+		}
+	}
+
 	@PostMapping("/upload")
 	public String upload(WebRequest request,
 						 @ModelAttribute("CsvImport") CsvImport csvImport,