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Here, we can see in the above image that the product is not present for this product ID. But we are getting proper 200 status. which is not a proper understandable response.<\/p>\n
Using Create custom exception classes that extend You can create as many custom exception classes as needed for different error scenarios.<\/p>\n Create a global exception handler class annotated with Here’s an example:<\/p>\n In this example, we\u2019ve created three exception-handling methods: one for handling In your controller methods, throw custom exceptions when needed. For example:<\/p>\n In this example, when a product is not found ( Now, when you access your RESTful endpoints and an exception is thrown, the global exception handler will catch the exception and return the appropriate HTTP status and error message.<\/p>\n For example, if you make a GET request to By following these steps, you\u2019ve added custom exception handling using @ControllerAdvice<\/code> in Spring allows you to create a centralized exception handler that can handle exceptions thrown by controllers in your application. This is a powerful feature for custom exception handling. Here’s a step-by-step guide on how to implement custom exception handling using @ControllerAdvice<\/code> in Spring:<\/p>\nStep 1: Create Custom Exception Classes<\/strong><\/h3>\n
RuntimeException<\/code> Or a suitable base exception class. For example:<\/p>\npublic<\/span> class<\/span> ProductNotFoundException<\/span> extends<\/span> RuntimeException<\/span> {\r\n public<\/span> ProductNotFoundException<\/span>(String message)<\/span> {\r\n super<\/span>(message);\r\n }\r\n}<\/span><\/pre>\npublic<\/span> class<\/span> InvalidRequestException<\/span> extends<\/span> RuntimeException<\/span> {\r\n public<\/span> InvalidRequestException<\/span>(String message)<\/span> {\r\n super<\/span>(message);\r\n }\r\n}<\/span><\/pre>\nStep 2: Create a Global Exception Handler<\/strong><\/h3>\n
@ControllerAdvice<\/code>. This class will contain methods to handle various exceptions.<\/p>\n@ControllerAdvice<\/span>\r\npublic<\/span> class<\/span> GlobalExceptionHandler<\/span> {\r\n\r\n @ExceptionHandler(ProductNotFoundException.class)<\/span>\r\n public<\/span> ResponseEntity<String> handleProductNotFoundException<\/span>(ProductNotFoundException ex)<\/span> {\r\n return<\/span> new<\/span> ResponseEntity<\/span><>(ex.getMessage(), HttpStatus.NOT_FOUND);\r\n }\r\n\r\n @ExceptionHandler(InvalidRequestException.class)<\/span>\r\n public<\/span> ResponseEntity<String> handleInvalidRequestException<\/span>(InvalidRequestException ex)<\/span> {\r\n return<\/span> new<\/span> ResponseEntity<\/span><>(ex.getMessage(), HttpStatus.BAD_REQUEST);\r\n }\r\n\r\n @ExceptionHandler(Exception.class)<\/span>\r\n public<\/span> ResponseEntity<String> handleOtherExceptions<\/span>(Exception ex)<\/span> {\r\n return<\/span> new<\/span> ResponseEntity<\/span><>(\"An error occurred: \"<\/span> + ex.getMessage(), HttpStatus.INTERNAL_SERVER_ERROR);\r\n }\r\n}<\/span><\/pre>\nProductNotFoundException<\/code>, one for handling InvalidRequestException<\/code>, and another for handling general exceptions. These methods return appropriate HTTP response statuses and error messages.<\/p>\nStep 3: Throw Custom Exceptions in Your Controllers<\/strong><\/h3>\n
@RestController<\/span>\r\n@RequestMapping(\"\/api\/products\")<\/span>\r\npublic<\/span> class<\/span> ProductController<\/span> {\r\n @Autowired<\/span>\r\n private<\/span> ProductService productService;\r\n\r\n @GetMapping(\"\/{id}\")<\/span>\r\n public<\/span> ResponseEntity<Product> getProductById<\/span>(@PathVariable<\/span> Long id)<\/span> {\r\n Product<\/span> product<\/span> =<\/span> productService.getProductById(id);\r\n if<\/span> (product == null<\/span>) {\r\n throw<\/span> new<\/span> ProductNotFoundException<\/span>(\"Product not found with ID: \"<\/span> + id);\r\n }\r\n return<\/span> ResponseEntity.ok(product);\r\n }\r\n\r\n @PostMapping<\/span>\r\n public<\/span> ResponseEntity<String> createProduct<\/span>(@RequestBody<\/span> Product product)<\/span> {\r\n if<\/span> (product == null<\/span>) {\r\n throw<\/span> new<\/span> InvalidRequestException<\/span>(\"Invalid product request\"<\/span>);\r\n }\r\n productService.createProduct(product);\r\n return<\/span> ResponseEntity.status(HttpStatus.CREATED).body(\"Product created successfully\"<\/span>);\r\n }\r\n \/\/ Other controller methods<\/span>\r\n}<\/span><\/pre>\ngetProductById<\/code>) or an invalid request is made (createProduct<\/code>), we throw custom exceptions (ProductNotFoundException<\/code> and InvalidRequestException<\/code>).<\/p>\nStep 4: Test the Exception Handling<\/strong><\/h3>\n
\/api\/products\/123<\/code>, and a product with ID 123 is not found, the response will have a status code of 404 (NOT FOUND) and an error message like “Product not found with ID: 123.”<\/p>\n@ControllerAdvice<\/code> in your Spring Boot application, allowing you to handle specific exceptions gracefully and provide meaningful error responses to clients.<\/p>\n
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