How to fix ineffective global exception handling in Spring Boot?

To solve the issue of Spring Boot global exception handling not working, you can try the following steps:

1. Make sure that the global exception handler is correctly configured in your Spring Boot application. The global exception handler can be implemented by implementing the HandlerExceptionResolver interface or using the @ControllerAdvice annotation.
2. Ensure that the priority of the global exception handler is higher than other exception handlers. You can use the @Order annotation or the Ordered interface to set the priority of the global exception handler.
3. Check if the exception types in the global exception handler are correct. The global exception handler should be able to handle all possible types of exceptions, and can use the Exception class or its subclasses to catch all exceptions.
4. Check if the method of the global exception handler is set up correctly. The method for the global exception handler should use the @ExceptionHandler annotation to specify the type of exception to be handled, and can also use other annotations for handling the exception logic.
5. Check if the global exception handler is able to properly handle exceptions. You can add logging or print exception information in the methods of the global exception handler to verify if exceptions are being correctly caught and handled.

If the above steps have been correctly configured and checked, but the global exception handling is still not working, there may be other reasons causing the issue. Further analysis and debugging can be done based on the actual situation, such as checking logs, examining the configuration and priority of other exception handlers, etc.