From 533acce8e212a792a48323d2174955ae7ff4d9d3 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Fri, 20 Mar 2026 15:45:02 +0000
Subject: [PATCH 1/2] Initial plan


From 902bbb1c5992015e7afc3e21279e724b19bcd0fd Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Fri, 20 Mar 2026 15:54:21 +0000
Subject: [PATCH 2/2] Fix DateTimeParseException for malformed date query
 params

Co-authored-by: lukepring <68820847+lukepring@users.noreply.github.com>
---
 .../presentation/WebPageController.java       | 28 ++++++++++++++++---
 1 file changed, 24 insertions(+), 4 deletions(-)

diff --git a/stockscope/src/main/java/com/sharecomparison/presentation/WebPageController.java b/stockscope/src/main/java/com/sharecomparison/presentation/WebPageController.java
index 78ff57d..fde285d 100644
--- a/stockscope/src/main/java/com/sharecomparison/presentation/WebPageController.java
+++ b/stockscope/src/main/java/com/sharecomparison/presentation/WebPageController.java
@@ -7,10 +7,13 @@
 import java.util.List;
 import java.util.Map;   // or GetMapping if form is GET
 
+import org.springframework.format.annotation.DateTimeFormat;
 import org.springframework.stereotype.Controller;
 import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.ExceptionHandler;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.method.annotation.MethodArgumentTypeMismatchException;
 
 import com.sharecomparison.application.MarketDataService;
 import com.sharecomparison.domain.PriceData;
@@ -38,12 +41,12 @@ public String showForm(Model model) {
     public String compare(
             @RequestParam String symbol1,
             @RequestParam String symbol2,
-            @RequestParam(required = false) String startDate,
-            @RequestParam(required = false) String endDate,
+            @RequestParam(required = false) @DateTimeFormat(iso = DateTimeFormat.ISO.DATE) LocalDate startDate,
+            @RequestParam(required = false) @DateTimeFormat(iso = DateTimeFormat.ISO.DATE) LocalDate endDate,
             Model model) {
 
-        LocalDate start = (startDate != null && !startDate.isBlank()) ? LocalDate.parse(startDate) : LocalDate.now().minusYears(1);
-        LocalDate end = (endDate != null && !endDate.isBlank()) ? LocalDate.parse(endDate) : LocalDate.now();
+        LocalDate start = (startDate != null) ? startDate : LocalDate.now().minusYears(1);
+        LocalDate end = (endDate != null) ? endDate : LocalDate.now();
 
         symbol1 = symbol1.trim().toUpperCase();
         symbol2 = symbol2.trim().toUpperCase();
@@ -131,4 +134,21 @@ public String compare(
 
         return "index";
     }
+
+    @ExceptionHandler(MethodArgumentTypeMismatchException.class)
+    public String handleDateParseError(MethodArgumentTypeMismatchException ex, Model model) {
+        String paramName = ex.getName();
+        if (LocalDate.class.equals(ex.getRequiredType())
+                && ("startDate".equals(paramName) || "endDate".equals(paramName))) {
+            model.addAttribute("error",
+                    "Invalid date format for '" + paramName + "'. Please use YYYY-MM-DD (e.g. 2024-01-15).");
+        } else {
+            model.addAttribute("error", "Invalid value for parameter '" + paramName + "'.");
+        }
+        model.addAttribute("symbol1", "AAPL");
+        model.addAttribute("symbol2", "MSFT");
+        model.addAttribute("startDate", LocalDate.now().minusYears(1).toString());
+        model.addAttribute("endDate", LocalDate.now().toString());
+        return "index";
+    }
 }
\ No newline at end of file