![]() The Spring Boot annotations we will cover all behave this way, allowing the developer's customized annotation parameters to define how their application works. This is done by marking the annotations with a RUNTIME retention policy, which we won't discuss in detail now. It just sets a condition that may or may not trigger a compiler error.įurthermore, custom annotations can be created that do make it through the compiler and affect the bytecode. However, this annotation doesn't affect the bytecode produced by the compiler. If it doesn't, the compiler will throw an error. One of the most common Java annotations that you have probably seen is This is a very simple annotation that tells the compiler that the annotated method must exist in the parent class. These parameters allow developers to customize the behavior of the annotated code, as we will see later when we get to the Spring Boot annotations. Parameters (like name and value in the previous snippet) can be specified after the annotation label. Depending on the purpose of an annotation, it could be applied to a class, method, variable, field, or other code structure. In the snippet above, the annotation is applied to a method. An annotation is prefixed with an "at-sign" and placed on the line before the code that it applies to, as follows: value="value") An annotation is a label that developers can add onto a specific piece of code to provide additional context or functionality. The Java programming language includes annotations as a native feature. Then we'll present our picks for 5 essential annotations that developers should be familiar with when building applications with Spring Boot. In this article, we'll provide some background on annotations in Java and Spring Boot.
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