How Can I Efficiently Scan the Java Classpath for Annotated Classes at Runtime?

Scanning Java Annotations at Runtime: Traversing the Classpath for Annotated Classes

In Java, annotations provide a powerful mechanism for adding metadata to classes, methods, and other program elements. By scanning the classpath at runtime, it becomes possible to identify and utilize these annotations for various purposes.

Search the Classpath for Annotated Classes

To scan the entire classpath for an annotated class, consider leveraging the org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider class. This provider offers fine-grained control over the scanning process, enabling you to specify base packages and filtering criteria.

Using the API

1. Instantiate a ClassPathScanningCandidateComponentProvider object:

ClassPathScanningCandidateComponentProvider scanner =
new ClassPathScanningCandidateComponentProvider(<includeDefaultFilters>);

2. Add an inclusion filter to look for specific annotations:

scanner.addIncludeFilter(new AnnotationTypeFilter(<yourAnnotation>.class));

3. Specify the base package for scanning:

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

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