How Can I Dynamically Detect Java Annotations at Runtime?

Detecting Java Annotations Dynamically

In the realm of Java development, the ability to detect and access annotations at runtime is crucial for various applications. One common scenario involves searching the entire classpath for classes annotated with a specific marker.

Accessing Annotated Classes at Runtime

To scan the classpath for annotated classes, consider leveraging the ClassPathScanningCandidateComponentProvider class from the Spring Framework. This API allows developers to search for eligible candidates based on specified criteria.

Implementation

To utilize this functionality, follow these steps:

1. Instantiate a ClassPathScanningCandidateComponentProvider object.

2. Specify include filters to narrow down the search based on annotations. For example:

   scanner.addIncludeFilter(new AnnotationTypeFilter(MyAnnotation.class));

3. Execute the scan within a specified base package:

   for (BeanDefinition bd : scanner.findCandidateComponents(basePackage)) {
       System.out.println(bd.getBeanClassName());
   }

This implementation scans the classpath, identifying classes annotated with MyAnnotation and printing their fully qualified names.

By harnessing the power of dynamic annotation detection, developers can execute intricate operations at runtime, allowing for flexible and customizable applications.

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