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Custom Exception Hierarchy

Defines a custom exception hierarchy with domain-specific exceptions, demonstrating proper exception chaining, message formatting, and multi-catch handling.

JavaResilience

Code

snippet
public class CustomExceptions {

    static class DomainException extends Exception {
        public DomainException(String message, Throwable cause) {
            super(message, cause);
        }
    }

    static class ValidationException extends DomainException {
        public ValidationException(String message) {
            super(message, null);
        }
    }

    static class NotFoundException extends DomainException {
        public NotFoundException(String id) {
            super("Resource not found: " + id, null);
        }
    }

    static void validateAge(int age) throws ValidationException {
        if (age < 0 || age > 150) {
            throw new ValidationException("Invalid age: " + age);
        }
    }

    static String findUser(String id) throws NotFoundException {
        if (!"admin".equals(id)) {
            throw new NotFoundException(id);
        }
        return "Administrator";
    }

    public static void main(String[] args) {
        try {
            validateAge(200);
            findUser("guest");
        } catch (ValidationException | NotFoundException e) {
            System.err.println("Error: " + e.getMessage());
        }
    }
}

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