This Java project shows you how to catch custom exceptions. This project was done with Spring Boot 2 to take advantage of the annotation.

We have an ExceptionGlobalResponse to catch RuntimeException and Exception an annotation through the @ControllerAdvice annotation. We also created the YoungAgeException class that contains my own RuntimeException exception.

//throw with object
throw YoungAgeException.of(young);

//throw with specific message
throw new YoungAgeException("Age cannot exceed");

When that type of exception is thrown, ExceptionGlobalResponse catches because it has the @ExceptionHandler with this specific YoungAgeException annotation and displays a custom response.