Refactor packages and add exception handler.

Renamed various classes to follow the "controlers" package structure for better organization and consistency. Added `ControllerExceptionHandler` to manage validation exceptions globally and improve error logging.

src/main/java/com/alttd/forms/controlers/ControllerExceptionHandler.java

@@ -0,0 +1,47 @@
+package com.alttd.forms.controlers;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.validation.FieldError;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.ResponseStatus;
+
+import java.util.HashMap;
+import java.util.Map;
+
+@ControllerAdvice
+public class ControllerExceptionHandler {
+
+    private static final Logger logger = LoggerFactory.getLogger(ControllerExceptionHandler.class);
+
+    public ControllerExceptionHandler() {
+        logger.info("ControllerExceptionHandler initialized");  // Ensure this gets logged
+    }
+
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    @ResponseStatus(HttpStatus.BAD_REQUEST)
+    public ResponseEntity<Map<String, String>> handleValidationExceptions(MethodArgumentNotValidException ex) {
+        logger.debug("invalid request", ex);
+        Map<String, String> errors = new HashMap<>();
+        ex.getBindingResult().getAllErrors().forEach((error) -> {
+            String fieldName = ((FieldError) error).getField();
+            String errorMessage = error.getDefaultMessage();
+            errors.put(fieldName, errorMessage);
+        });
+        if (logger.isDebugEnabled()) {
+            try {
+                String errorsAsString = new ObjectMapper().writeValueAsString(errors);
+                logger.debug("Invalid parameters\n{}", errorsAsString);
+            } catch (JsonProcessingException e) {
+                logger.warn("Failed to parse errors to json", e);
+            }
+        }
+        return ResponseEntity.badRequest().body(errors);
+    }
+}

src/main/java/com/alttd/forms/controlers/apply/StaffAppController.java

@@ -1,4 +1,4 @@
-package com.alttd.forms.apply;
+package com.alttd.forms.controlers.apply;
 
 import com.alttd.forms.form.StoreFormQuery;
 import com.alttd.forms.mail.verification.VerificationResult;
@@ -8,10 +8,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
-import org.springframework.web.bind.annotation.PostMapping;
-import org.springframework.web.bind.annotation.RequestBody;
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.bind.annotation.*;
 
 import java.util.concurrent.CompletableFuture;
 

src/main/java/com/alttd/forms/controlers/apply/StaffAppFormData.java

@@ -1,4 +1,4 @@
-package com.alttd.forms.apply;
+package com.alttd.forms.controlers.apply;
 
 import com.alttd.forms.form.Form;
 import jakarta.validation.constraints.*;

src/main/java/com/alttd/forms/controlers/contact/ContactController.java

@@ -1,4 +1,4 @@
-package com.alttd.forms.contact;
+package com.alttd.forms.controlers.contact;
 import com.alttd.forms.form.StoreFormQuery;
 import com.alttd.forms.mail.verification.VerificationResult;
 import com.alttd.forms.mail.verification.Verify;

src/main/java/com/alttd/forms/controlers/contact/ContactFormData.java

@@ -1,4 +1,4 @@
-package com.alttd.forms.contact;
+package com.alttd.forms.controlers.contact;
 
 import com.alttd.forms.form.Form;
 import jakarta.validation.constraints.Email;

src/main/java/com/alttd/forms/verify_mail/FormQuery.java

@@ -1,6 +1,6 @@
 package com.alttd.forms.verify_mail;
 
-import com.alttd.forms.contact.ContactFormData;
+import com.alttd.forms.controlers.contact.ContactFormData;
 import com.alttd.forms.database.DatabaseConnection;
 import com.alttd.forms.form.Form;
 import com.fasterxml.jackson.core.JsonProcessingException;

src/test/java/TestForm.java

@@ -1,4 +1,4 @@
-import com.alttd.forms.contact.ContactFormData;
+import com.alttd.forms.controlers.contact.ContactFormData;
 import com.alttd.forms.form.StoreFormQuery;
 import com.alttd.forms.database.DatabaseConnection;
 import com.alttd.forms.form.Form;