![]() Make sure the library with annotations is configured for your project. If your project is missing nullability annotations, completely or partially, you can have IntelliJ IDEA infer and insert the nullability annotations for you. Go to Settings Control+Alt+S | Build, Execution, Deployment | Compiler and uncheck the Add runtime assertions for notnull-annotated methods and parameters option. If this is not the desired effect for you, you can disable these assertions. This fail-fast behavior may help you to diagnose the problems at an early stage. When you compile your project, the IDE adds assertions to all code elements annotated with These assertions will throw an error if the elements happen to be null at runtime. Under Options, select Configure Annotations. Go to Settings | Editor | Inspections | Probable bugs | Nullability and data flow problems. IntelliJ IDEA will then use them for determining the nullability of a symbol. While IntelliJ IDEA recognizes the popular nullability annotations, you may still want to add your custom annotations to the list. For example, IntelliJ IDEA will analyze the data flow in your project and report attempts to dereference a variable that can potentially be null, or vice versa, suggest getting rid of redundant guard conditions where they are safe to remove. On the other hand, IntelliJ IDEA's static analysis will be using these annotations to catch potential errors at design-time. By explicitly declaring the nullability of elements, the code becomes easier to maintain and less prone to nullability-related errors. Nullability annotations are a subset of code contract annotations. Examples of such annotation frameworks are Checker Framework and ErrorProne Nullability annotations IntelliJ IDEA recognizes popular Java annotations and takes them into account when analyzing code. They can be used by developers to better understand the implications of using a particular API as well as assist static analyzers to identify problematic areas. There is also a class of annotations describing code semantics and contracts. The metadata provided by these annotations can be used both at compile- and run-time, for example, to generate boilerplate code, or interact with the user classes through reflection. Also, many libraries and frameworks, such as Spring and Lombok, define their own annotations. In Java, there is a set of built-in annotations. After the annotations get replaced with their corresponding constructors, we see issues with the static code analyzer as below.Annotations are pieces of metadata that provide information about code elements, such as classes, methods, or parameters. In contrast, let’s replace the same class with its Delomboked version. In the case of the above example (that uses Lombok) the code builds without any issues. With public class Book įor the project, we have configured a static code analyzer checkstyle that runs as a part of the maven verify lifecycle. It makes the Lombok libraries available to the compiler but is not a dependency on the final deployable jar: To use the Lombok features in a new or an existing project, add a compile-time dependency to lombok as below. Install the Lombok plugin and restart Eclipse. Once installed, we need to ensure annotation processing is enabled as in the example configuration below.Īnnotation processing makes it possible for the IDE to evaluate the Lombok annotations and generate the source code from them at compile time.įor Eclipse, go to Help menu > Install new Software > Add. For earlier versions, plugins can be installed from here. For example, IntelliJ version 2020.3 and above is compatible with Lombok without a plugin. IDE SupportĪll popular IDEs support Lombok. This library provides a set of user-friendly annotations that generate the code at compile time, helping the developers save time and space and improving code readability. This article is accompanied by a working code example on GitHub.Īccording to official docs, “Project Lombok is a java library that automatically plugs into your editor and build tools, spicing up your Java.” In this article, we will focus on factors that will help you make an informed decision about using the library effectivelyĪnd being wary of its consequences. However, among the developer community, it has been both embraced and criticized for reasons I would like to elaborate here. Project Lombok is a popular library that helps us to write clear, concise, and less repetitive Java code. ![]()
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