CatNotFound

import lombok.Data;
import lombok.NonNull;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;

@Slf4j
public class SimpleExceptionChecker {

    public static void foundCat(Cat cat) throws CatException {
        if (cat == null)
            throw new CatException("Null cat detected!");
        log.info("Found cat! Word {} printed on its collar.",cat.getName());
    }

    private static void callToAnimalShelter(){
        log.info("We calling to animal shelter about the cat.");
    }

    public static void main(String[] args) {
        Cat fluffy = new Cat("fluffy"); //here: Found cat! Word fluffy printed on its collar.
        Cat unknownCat  = null; //in this case:
                                /*c.e.d._Mains.CatException: Null cat detected!
                                at c.e.d._Mains.SimpleExceptionChecker.foundCat(SimpleExceptionChecker.java:13)
                                at c.e.d._Mains.SimpleExceptionChecker.main(SimpleExceptionChecker.java:25)*/

                                 //We calling to animal shelter about the cat.
        try {
           // foundCat(fluffy);
            foundCat(unknownCat);
        } catch (CatException e) {
            e.printStackTrace();
            callToAnimalShelter();
        }
    }
}

@Data
@RequiredArgsConstructor
class Cat {
    @NonNull
    private String name;
}

class CatException extends Throwable {
    public CatException(String message) {
        super(message);
    }
}