feat(ExceptionController): implementados ExceptionHandlers para las excepciones personalizadas

src/main/java/com/example/apprecetas/exceptions/ExceptionController.java

+package com.example.apprecetas.exceptions;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.http.HttpStatusCode;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+import java.time.LocalDateTime;
+
+@RestControllerAdvice
+public class ExceptionController {
+
+    //MethodArgumentNotValidException
+    @ExceptionHandler(UnvalidInputEntityException.class)
+    @ResponseStatus(HttpStatus.BAD_REQUEST)
+    public ResponseEntity<ErrorMessage> handle(UnvalidInputEntityException ex) {
+        return new ResponseEntity<>(new ErrorMessage(LocalDateTime.now(), HttpStatus.BAD_REQUEST.value(),
+                ex.getMessage()), HttpStatusCode.valueOf(HttpStatus.BAD_REQUEST.value()));
+    }
+
+    @ExceptionHandler(EntityNotFoundException.class)
+    @ResponseStatus(HttpStatus.NOT_FOUND)
+    public ResponseEntity<ErrorMessage> handle(EntityNotFoundException ex) {
+        return new ResponseEntity<>(new ErrorMessage(LocalDateTime.now(), HttpStatus.NOT_FOUND.value(),
+                ex.getMessage()), HttpStatusCode.valueOf(HttpStatus.NOT_FOUND.value()));
+    }
+
+}