![]() ![]() 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. Annotations are pieces of metadata that provide information about code elements, such as classes, methods, or parameters. ![]()
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