Additional Notes
Why is RetentionPolicy.RUNTIME essential for framework annotations?
Track: Java
Topic: Java Annotations
Focus: Retention Policies
Java: Retention Policies
Answer
Ensures annotations are available at runtime.
RetentionPolicy.RUNTIME allows annotations to be accessed during the execution of a Java program, which is crucial for frameworks like Spring Boot. They rely on reflection to inspect annotations and apply logic, such as mapping HTTP requests to methods. For instance, @RequestMapping on a method in Spring Boot must be runtime-retained to map web requests properly.
RetentionPolicy.RUNTIME allows annotations to be accessed during the execution of a Java program, which is crucial for frameworks like Spring Boot. They rely on reflection to inspect annotations and apply logic, such as mapping HTTP requests to methods. For instance, @RequestMapping on a method in Spring Boot must be runtime-retained to map web requests properly.
Topics: Java Java Annotations Retention Policies