Prev Next

Java / Lombok Interview questions

What is the purpose of Lombok in Java?

Lombok exists to cut down the sheer amount of repetitive, mechanical code that plain Java classes typically require — particularly simple data-holding classes (often called POJOs) that need getters, setters, constructors, and standard Object method overrides just to function correctly with frameworks, collections, and equality checks.

Without Lombok, a class with five fields might need 40-plus lines of generated-looking code just for getters, setters, and a proper equals/hashCode/toString. With Lombok, a handful of annotations replace all of that, letting the class definition focus on what data it actually holds rather than the mechanical methods every field needs.

@Getter @Setter @ToString @EqualsAndHashCode
public class Product {
    private String id;
    private String name;
    private double price;
}

What kind of code does Lombok primarily reduce?
What does a class definition look like with Lombok compared to without it?

More Related questions...

What is Lombok? What is the purpose of Lombok in Java? How do you add Lombok to a Maven project? How do you add Lombok to a Gradle project? What is @Getter used for? What is @Setter used for? What is @ToString used for? What is @EqualsAndHashCode used for? What is @NoArgsConstructor used for? What is @AllArgsConstructor used for? What is @RequiredArgsConstructor used for? What is @Data used for? What is @Value used for? What is @Builder used for? What is @Slf4j used for? What is @NonNull used for? What is @Cleanup used for? What is @SneakyThrows used for? What is @Synchronized used for? What is @With used for? Describe how Lombok works under the hood (annotation processing)? How do you install the Lombok plugin in an IDE? What are the types of Lombok annotations? How do you exclude a field from @ToString? How do you exclude a field from @EqualsAndHashCode? What is @Builder.Default used for? Why does IDE support matter for using Lombok effectively? What is the difference between @Data and @Value? What is the difference between @NoArgsConstructor, @AllArgsConstructor, and @RequiredArgsConstructor? When should you use @Builder instead of a constructor? How does @EqualsAndHashCode handle inheritance by default? Why can @Data be risky on JPA entity classes? How do you combine Lombok's @Builder with inheritance? What is the difference between @Getter(lazy = true) and a normal @Getter? Why should you be careful using @EqualsAndHashCode on Hibernate entities with lazy-loaded proxies? What is @Accessors used for and how does it change fluent-style access? How does Lombok handle @ToString with circular references? What is @FieldDefaults used for? What is @Delegate used for? Why is Lombok's approach considered a "compiler hack" and what are the implications? How do you debug generated Lombok code? What issues can Lombok cause with static code analysis tools? What are the risks of using @Data with mutable collections? How does delombok work and when would you use it? Why might Lombok cause issues in multi-module Maven builds with annotation processor ordering? What is @UtilityClass used for? What is the difference between Lombok's @Builder and the traditional Gang-of-Four Builder pattern? How do you use Lombok with Java records - is Lombok still needed?
Show more question and Answers...


Comments & Discussions