Package com.example.blogs.app.exception

Class GlobalExceptionHandler

java.lang.Object

com.example.blogs.app.exception.GlobalExceptionHandler

@RestControllerAdvice
public class GlobalExceptionHandler
extends Object

Centralized exception handler that translates exceptions into standardized error responses. Handles validation errors, domain exceptions, and generic failures.

Constructor Summary

Constructors

Constructor	Description
GlobalExceptionHandler()

Method Summary

Modifier and Type	Method	Description
ResponseEntity<ErrorResponse>	handleMethodValidationException(HandlerMethodValidationException exception, jakarta.servlet.http.HttpServletRequest request)	Handles validation errors for method parameters and path variables.
ResponseEntity<ErrorResponse>	handleMissingRequestBodyException(HttpMessageNotReadableException exception, jakarta.servlet.http.HttpServletRequest request)	Handles errors when HTTP message body cannot be read or parsed.
ResponseEntity<ErrorResponse>	handleRegularException(Exception exception, jakarta.servlet.http.HttpServletRequest request)	Handles all domain-specific and unhandled exceptions.
ResponseEntity<ErrorResponse>	handleValidationException(MethodArgumentNotValidException exception, jakarta.servlet.http.HttpServletRequest request)	Handles validation errors for request body fields annotated with Jakarta validation constraints.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

GlobalExceptionHandler

public GlobalExceptionHandler()

Method Details

handleValidationException

@ExceptionHandler(org.springframework.web.bind.MethodArgumentNotValidException.class)
public ResponseEntity<ErrorResponse> handleValidationException(MethodArgumentNotValidException exception,
 jakarta.servlet.http.HttpServletRequest request)

Handles validation errors for request body fields annotated with Jakarta validation constraints. Extracts all validation error messages and returns them in a standardized error response.

Parameters:

exception - the validation exception containing binding result errors

request - the HTTP request that triggered the exception

Returns:

error response with HTTP 400 status and list of validation errors

handleMethodValidationException

@ExceptionHandler(org.springframework.web.method.annotation.HandlerMethodValidationException.class)
public ResponseEntity<ErrorResponse> handleMethodValidationException(HandlerMethodValidationException exception,
 jakarta.servlet.http.HttpServletRequest request)

Handles validation errors for method parameters and path variables. Processes field errors and parameter constraint violations into standardized error messages.

Parameters:

exception - the validation exception containing parameter validation errors

request - the HTTP request that triggered the exception

Returns:

error response with HTTP 400 status and list of validation errors

handleMissingRequestBodyException

@ExceptionHandler(org.springframework.http.converter.HttpMessageNotReadableException.class)
public ResponseEntity<ErrorResponse> handleMissingRequestBodyException(HttpMessageNotReadableException exception,
 jakarta.servlet.http.HttpServletRequest request)

Handles errors when HTTP message body cannot be read or parsed. Processes different scenarios: invalid enum values, unrecognized fields, missing body, or malformed JSON.

Parameters:

exception - the message parsing exception

request - the HTTP request that triggered the exception

Returns:

error response with HTTP 400 status and descriptive error message

handleRegularException

@ExceptionHandler(java.lang.Exception.class)
public ResponseEntity<ErrorResponse> handleRegularException(Exception exception,
 jakarta.servlet.http.HttpServletRequest request)

Handles all domain-specific and unhandled exceptions. Maps exceptions to appropriate HTTP status codes using the status mapper. Logs server errors (5xx) with full context for debugging.

Parameters:

exception - the exception to handle

request - the HTTP request that triggered the exception

Returns:

error response with appropriate HTTP status and exception details