Lombok initialize list, In this blog, we’ll explore why null lists in getters are problematic, how Lombok handles list fields by default, and **four actionable strategies** to ensure your Lombok-generated getters return empty lists instead of `null`. Explore effective techniques and best practices for clean code. I originally initialized this in the constructor before I decided to use lombok to remove the bulk of Nov 10, 2025 · However, Lombok’s default behavior for list getters doesn’t automatically solve the null problem. One of the key features of Project Lombok is the @Builder annotation, which automatically creates Builder classes for creating immutable objects. emptyList(). It's null because it's never initialized. Using lombok for a project, I have an ArrayList. Learn how to initialize a null list using a Lombok getter in Java. Mar 31, 2020 · Initialize objects with Lombok Ask Question Asked 5 years, 11 months ago Modified 5 years, 10 months ago Learn how to effectively utilize Lombok's @Builder, @Default, and @Singular annotations to initialize a List in Java for cleaner, more concise code. Feb 15, 2017 · However in this case is the constructor automatically generated by Lombok. Learn why Lombok's @Builder does not initialize collections and how to use @Singular for proper initialization. In this tutorial, we’re Nov 22, 2025 · However, Lombok’s `@Builder` annotation, while powerful, has a quirk: it often ignores field initializers by default, leading to unexpected `null` values or incorrect defaults. This guide will show you how to initialize an ArrayList within a class using these annotations effectively. In this blog, we’ll demystify Lombok default values, explore how to initialize them using constructors, and tackle the infamous `@Builder. The @Data annotation generates getters, setters, and other utility methods while the @Builder annotation provides a convenient way to create objects in a flexible manner. Is there any way, how to ensure that the list property will always be initialized at least to an empty collection or do I have to start writing the tedious null checks?. However, populating collections in our objects can be clumsy with the standard Lombok-generated Builderclasses. Default` issue. The Lombok library provides a great way of simplifying data objects. But this does not happen: Using Lombok's annotations simplifies Java class development by reducing boilerplate code. As Java applications grow, creating and initializing objects can become a cumbersome task. The traditional solution is the Builder design pattern, which provides a readable, fluent API for Simplifying Object Creation Using Lombok's @Builder Annotation Creating objects in Java can sometimes be a tedious and error-prone task. Many times, we find ourselves writing lengthy constructors or repetitive boilerplate code to initialize objects. What is Lombok? Lombok is a popular Java library that aims to eliminate Jul 22, 2016 · Initialize list if list is null with lombok getter? Ask Question Asked 9 years, 7 months ago Modified 1 year, 11 months ago Sep 28, 2015 · When I create a new Movie using the builder, without specifying any actors, I would expect Lombok to initialize my List to Collections. This is where Lombok's @Builder annotation comes to the rescue. We’ve all seen them: constructors with a long list of parameters, some of which are optional, leading to multiple overloaded constructors or the error-prone “telescoping constructor” anti-pattern.
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