Is it permissible to implement exception handling directly within the application's business logic?

Implementing exception handling directly within the application's business logic is permissible, but with some caveats:

• Exception handling should be meaningful and aimed at recovery or proper termination of the operation.
• Error handling logic should not clutter the business logic to keep the code readable and maintainable.
• It is often recommended to isolate exception handling into separate layers or use patterns such as global handlers, middleware, or aspects.

Example in Java:

public void processOrder(Order order) {
    try {
        validate(order);
        save(order);
    } catch (ValidationException e) {
        // Handle validation error
        System.out.println("Validation error: " + e.getMessage());
    } catch (DatabaseException e) {
        // Handle database error
        System.out.println("Database error: " + e.getMessage());
    }
}

Thus, exception handling in business logic is possible but should be done carefully and not interfere with the main code.