Q24: What are the best practices for designing Custom Exceptions?
- Extend
RuntimeExceptionfor business rule violations (un-checked) unless caller recovery is mandatory. - Provide meaningful message strings and pass cause exceptions (
Throwable cause) to preserve stack traces. - Keep custom exception names suffixed with
Exception(e.g.,OrderNotFoundException). - Maintain standard constructor overloads (
(String),(String, Throwable)).
Key Takeaways
- Preserve original cause stack traces (
super(msg, cause)). - Prefer unchecked exceptions for application logic errors.
Knowledge Check
Why should custom exceptions accept a Throwable cause parameter in their constructors?