Add global exception handling

src/main/java/com/litoralregas/vpnprovisioner/common/exception/ApiErrorResponse.java

@@ -0,0 +1,12 @@
+package com.litoralregas.vpnprovisioner.common.exception;
+
+import java.time.Instant;
+
+public record ApiErrorResponse(
+        Instant timestamp,
+        int status,
+        String error,
+        String message,
+        String path
+) {
+}

src/main/java/com/litoralregas/vpnprovisioner/common/exception/GlobalExceptionHandler.java

@@ -0,0 +1,64 @@
+package com.litoralregas.vpnprovisioner.common.exception;
+
+import jakarta.servlet.http.HttpServletRequest;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.*;
+
+import java.time.Instant;
+import java.util.stream.Collectors;
+
+@RestControllerAdvice
+public class GlobalExceptionHandler {
+
+    @ExceptionHandler(ResourceNotFoundException.class)
+    @ResponseStatus(HttpStatus.NOT_FOUND)
+    public ApiErrorResponse handleNotFound(
+            ResourceNotFoundException exception,
+            HttpServletRequest request
+    ) {
+        return new ApiErrorResponse(
+                Instant.now(),
+                HttpStatus.NOT_FOUND.value(),
+                "Not Found",
+                exception.getMessage(),
+                request.getRequestURI()
+        );
+    }
+
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    @ResponseStatus(HttpStatus.BAD_REQUEST)
+    public ApiErrorResponse handleValidation(
+            MethodArgumentNotValidException exception,
+            HttpServletRequest request
+    ) {
+        String message = exception.getBindingResult()
+                .getFieldErrors()
+                .stream()
+                .map(error -> error.getField() + ": " + error.getDefaultMessage())
+                .collect(Collectors.joining(", "));
+
+        return new ApiErrorResponse(
+                Instant.now(),
+                HttpStatus.BAD_REQUEST.value(),
+                "Bad Request",
+                message,
+                request.getRequestURI()
+        );
+    }
+
+    @ExceptionHandler(IllegalArgumentException.class)
+    @ResponseStatus(HttpStatus.BAD_REQUEST)
+    public ApiErrorResponse handleIllegalArgument(
+            IllegalArgumentException exception,
+            HttpServletRequest request
+    ) {
+        return new ApiErrorResponse(
+                Instant.now(),
+                HttpStatus.BAD_REQUEST.value(),
+                "Bad Request",
+                exception.getMessage(),
+                request.getRequestURI()
+        );
+    }
+}

src/main/java/com/litoralregas/vpnprovisioner/common/exception/ResourceNotFoundException.java

@@ -0,0 +1,8 @@
+package com.litoralregas.vpnprovisioner.common.exception;
+
+public class ResourceNotFoundException extends RuntimeException {
+
+    public ResourceNotFoundException(String message) {
+        super(message);
+    }
+}

src/main/java/com/litoralregas/vpnprovisioner/router/service/RouterService.java

@@ -5,6 +5,7 @@ import com.litoralregas.vpnprovisioner.router.dto.RouterResponse;
 import com.litoralregas.vpnprovisioner.router.dto.UpdateRouterRequest;
 import com.litoralregas.vpnprovisioner.router.entity.Router;
 import com.litoralregas.vpnprovisioner.router.repository.RouterRepository;
+import com.litoralregas.vpnprovisioner.common.exception.ResourceNotFoundException;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
@@ -43,7 +44,7 @@ public class RouterService {
     @Transactional(readOnly = true)
     public RouterResponse findById(UUID id) {
         Router router = routerRepository.findById(id)
-                .orElseThrow(() -> new IllegalArgumentException("Router not found: " + id));
+                .orElseThrow(() -> new ResourceNotFoundException("Router not found: " + id));
 
         return toResponse(router);
     }
@@ -51,7 +52,7 @@ public class RouterService {
     @Transactional
     public RouterResponse update(UUID id, UpdateRouterRequest request) {
         Router router = routerRepository.findById(id)
-                .orElseThrow(() -> new IllegalArgumentException("Router not found: " + id));
+                .orElseThrow(() -> new ResourceNotFoundException("Router not found: " + id));
 
         router.updateDetails(
                 request.name(),
@@ -65,7 +66,7 @@ public class RouterService {
     @Transactional
     public void delete(UUID id) {
         Router router = routerRepository.findById(id)
-                .orElseThrow(() -> new IllegalArgumentException("Router not found: " + id));
+                .orElseThrow(() -> new ResourceNotFoundException("Router not found: " + id));
 
         routerRepository.delete(router);
     }