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How do you manage exceptions in a Spring Boot application?
In a Spring Boot application, managing exceptions properly ensures a better user experience, easier debugging, and cleaner code. Spring provides several ways to handle exceptions in a structured and maintainable way:
Using @ControllerAdvice
This is the most common and centralized approach. A class annotated with @ControllerAdvice can globally handle exceptions thrown by controllers. You define methods with @ExceptionHandler to catch specific exceptions and return meaningful responses.
@ExceptionHandler in Controllers
If you want to handle exceptions locally in a specific controller, you can define a method inside the controller and annotate it with @ExceptionHandler.
. Custom Exception Classes
Create custom exception classes (e.g., UserNotFoundException, InvalidInputException) to represent specific error cases. This makes your code more readable and errors easier to trace.
. Returning Proper HTTP Responses
Use ResponseEntity in your exception handler methods to return custom HTTP status codes and error messages, such as 404 for not found or 400 for bad requests.
Handling Validation Errors
For form input or request body validation, use annotations like @Valid or @Validated along with BindingResult. You can catch these exceptions (like MethodArgumentNotValidException) and return structured error responses.
Logging
Always log exceptions using a logging framework like SLF4J or Logback. This helps with troubleshooting and monitoring in production.
By using these techniques, you can create a robust exception-handling strategy that improves maintainability and user feedback in your Spring Boot application.
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