How should you correctly define an exception handler method in a Spring Boot controller to catch validation errors caused by @Valid annotated parameters?

easy📝 Syntax Q3 of 15

Spring Boot - Exception Handling

A@ExceptionHandler(Exception.class) public String handleAllExceptions() { ... }

B@ExceptionHandler(NullPointerException.class) public void handleNullPointer() { ... }

@ExceptionHandler(MethodArgumentNotValidException.class)
public ResponseEntity<String> handleValidation(MethodArgumentNotValidException ex) { ... }

@ExceptionHandler(IllegalArgumentException.class)
public ResponseEntity<String> handleIllegalArg() { ... }

Step-by-Step Solution

Solution:

Step 1: Identify exception type for validation errors
Spring Boot throws MethodArgumentNotValidException when @Valid validation fails.
Step 2: Use @ExceptionHandler with correct exception
Annotate a method with @ExceptionHandler(MethodArgumentNotValidException.class) to handle these errors.
Final Answer:
@ExceptionHandler(MethodArgumentNotValidException.class) public ResponseEntity handleValidation(MethodArgumentNotValidException ex) { ... } correctly defines the handler method.
Quick Check:
Use MethodArgumentNotValidException for validation error handling [OK]

Quick Trick: Catch MethodArgumentNotValidException for validation errors [OK]

Common Mistakes:

Catching unrelated exceptions like NullPointerException
Using generic Exception handler without specificity
Not including the exception parameter in the handler method

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How should you correctly define an exception handler method in a Spring Boot controller to catch validation errors caused by @Valid annotated parameters?

Step 1: Identify exception type for validation errors

Step 2: Use @ExceptionHandler with correct exception

Final Answer:

Quick Check:

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