Structured data logging with Log4j ObjectMessage

StructuredLoggingWithObjectMessage.java

@Data
@AllArgsConstructor
@NoArgsConstructor
public class ItemLog {
  private Integer totalItems;
  private List<OrderItem> items;
  public ItemLog(List<OrderItem> items) {
     this.items = items;
     this.totalItems = items.size();
  }
}

logger.info(new ObjectMessage(new ItemLog(orderItems));