Spring Boot - Exception Handling
To customize validation error responses in Spring Boot to return a JSON object listing each invalid field and its error message, which approach is most appropriate?
To customize validation error responses in Spring Boot to return a JSON object listing each invalid field and its error message, which approach is most appropriate?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Identify customization point
Validation errors throw MethodArgumentNotValidException which can be globally handled.Step 2: Use @ControllerAdvice and @ExceptionHandler
Creating a global exception handler allows intercepting validation exceptions and customizing the response.Step 3: Extract field errors
From the exception, extract field names and messages to build a structured JSON response.Final Answer:
Implement a @ControllerAdvice class with an @ExceptionHandler for MethodArgumentNotValidException that extracts field errors and builds a custom JSON response correctly describes this approach.Quick Check:
Use @ControllerAdvice with MethodArgumentNotValidException handler for custom JSON [OK]
Quick Trick: Use @ControllerAdvice and handle MethodArgumentNotValidException [OK]
Common Mistakes:
- Trying to override error pages instead of exception handling
- Using @ResponseStatus which only sets status, not response body
- Misusing @JsonIgnore which affects serialization, not validation
Master "Exception Handling" in Spring Boot
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