What is @Slf4j used for?

@Slf4j generates a private, static logger field named log, pre-configured for the SLF4J logging facade, saving you from writing the same one-line logger declaration in every class that needs logging.

@Slf4j
public class OrderService {
    public void placeOrder(Order o) {
        log.info("Placing order {}", o.getId());
    }
}
//  equivalent to manually writing:
//  private static final Logger log = LoggerFactory.getLogger(OrderService.class);

Lombok provides similar logger-generating annotations for other logging frameworks too — @Log4j2, @CommonsLog, @Log (for java.util.logging) — each generating the equivalent boilerplate declaration for that specific framework's logger type, bound to the correct class automatically.

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