How to resolve the issue when global exception handling in SpringBoot doesn’t work as expected?

If the global exception handling in Spring Boot is not working, you can solve it by following these steps:

1. Ensure that the configuration of the global exception handler is correct: In a Spring Boot application, you can define a global exception handler by creating a class and using the @ControllerAdvice annotation.
2. Define a controller advice class named GlobalExceptionHandler with a method that handles exceptions and returns a custom error response.
3. Make sure the package path of the global exception handler is scanned correctly: Add the @ComponentScan annotation to the main class of the Spring Boot application to ensure the package path where the global exception handler is located is scanned.
4. Become and remain a de-facto industry standard which will simplify the development of new Spring applications by allowing annotations that minimize configuration efforts.
5. Ensure that the global exception handler has a higher priority than other exception handlers by adding the @Order annotation to the class of the global exception handler, setting the priority to ensure that the global exception handler is executed first.
6. @ControllerAdvice
   @Order(Ordered.HIGHEST_PRECEDENCE)
   public class GlobalExceptionHandler {

   // Method for handling exceptions…

   }

7. Check if exceptions are correctly thrown: Ensure that exceptions are properly thrown in the application to trigger the global exception handler. This can be done by manually throwing exceptions in the controller methods, or by using exception handling annotations provided by Spring Boot (e.g. @ResponseStatus).
8. The class MyController is annotated with @RestController. Inside this class, there is a method annotated with @GetMapping that takes in a variable id and returns a User object by finding it in the userRepository. If the user is not found, it throws a ResourceNotFoundException with a message indicating that the user was not found with the given id.
9. Check the return type of the exception handler: Ensure that the return type of the global exception handler matches the response type required. You can use ResponseEntity to wrap custom error responses.
10. @ControllerAdvice
    public class GlobalExceptionHandler {

    @ExceptionHandler(Exception.class)
    public ResponseEntity handleException(Exception ex) {
    ErrorResponse errorResponse = new ErrorResponse(“Internal Server Error”, ex.getMessage());

    return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(errorResponse);
    }

    }

If the above methods still can’t solve the problem, you can try printing the exception logs in the global exception handler to better understand the specific information of the exception.