Initial commit

src/main/java/com/example/exception/GlobalExceptionHandler.java

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+/*
+ * Copyright 2025 Google. This software is provided as-is, without warranty or representation for any use or purpose.
+ * Your use of it is subject to your agreement with Google.
+ */
+
+package com.example.exception;
+
+import java.util.HashMap;
+import java.util.Map;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+
+@ControllerAdvice
+public class GlobalExceptionHandler {
+
+    private static final Logger logger = LoggerFactory.getLogger(GlobalExceptionHandler.class);
+
+    @ExceptionHandler(DialogflowClientException.class)
+    public ResponseEntity<Map<String, String>> handleDialogflowClientException(
+            DialogflowClientException ex) { 
+        Map<String, String> error = new HashMap<>();
+        error.put("error", "Error communicating with Dialogflow");
+        error.put("message", ex.getMessage());
+        logger.error("DialogflowClientException: {}", ex.getMessage());
+        return new ResponseEntity<>(error, HttpStatus.SERVICE_UNAVAILABLE);
+    }
+
+    @ExceptionHandler(GeminiClientException.class)
+    public ResponseEntity<Map<String, String>> handleGeminiClientException(GeminiClientException ex) {
+        Map<String, String> error = new HashMap<>();
+        error.put("error", "Error communicating with Gemini");
+        error.put("message", ex.getMessage());
+        logger.error("GeminiClientException: {}", ex.getMessage());
+        return new ResponseEntity<>(error, HttpStatus.SERVICE_UNAVAILABLE);
+    }
+
+    @ExceptionHandler(Exception.class)
+    public ResponseEntity<Map<String, String>> handleAllExceptions(Exception ex) {
+        Map<String, String> error = new HashMap<>();
+        error.put("error", "Internal Server Error");
+        error.put("message", ex.getMessage());
+        logger.error("An unexpected error occurred: {}", ex.getMessage(), ex);
+        return new ResponseEntity<>(error, HttpStatus.INTERNAL_SERVER_ERROR);
+    }
+}