A developer tries to customize validation error responses by overriding the default BindingResult but gets a runtime error. What is a likely mistake?

medium📝 Debug Q7 of 15

Spring Boot - Exception Handling

AMissing @ControllerAdvice annotation on the handler class

BNot adding @Valid before the request body parameter

CUsing @RequestParam instead of @RequestBody

DReturning ResponseEntity instead of String

Step-by-Step Solution

Solution:

Step 1: Understand global handler setup
To customize validation errors globally, the handler class must be annotated with @ControllerAdvice.
Step 2: Identify cause of runtime error
Without @ControllerAdvice, Spring does not recognize the handler, causing runtime errors when exceptions occur.
Final Answer:
Missing @ControllerAdvice annotation on the handler class -> Option A
Quick Check:
@ControllerAdvice is required for global exception handlers [OK]

Quick Trick: Use @ControllerAdvice for global validation error handlers [OK]

Common Mistakes:

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