How Can I Efficiently Discover Annotated Classes at Runtime Using ClassPathScanningCandidateComponentProvider?

Discovering Annotated Classes at Runtime

To search the classpath for annotated classes, consider employing the widely-acclaimed library org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.

ClassPathScanningCandidateComponentProvider Explained

ClassPathScanningCandidateComponentProvider harnesses the power of annotations to swiftly scan the classpath, commencing from a predefined base package. By meticulously applying specific include and exclude filters to the derived classes, it meticulously identifies viable candidates that meticulously satisfy the search criteria.

Practical Implementation

Instantiate ClassPathScanningCandidateComponentProvider, specifying whether or not to employ the default filter.

ClassPathScanningCandidateComponentProvider scanner =
new ClassPathScanningCandidateComponentProvider(<DO_YOU_WANT_TO_USE_DEFALT_FILTER>);

Define an AnnotationTypeFilter to delineate the targeted annotation.

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

Finally, initiate the scanning process within the specified base package, harvesting the discovered candidate classes.

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

Through harmonious integration of ClassPathScanningCandidateComponentProvider and proper configuration, you can effectively scan the classpath and discern classes adorned with the annotations of your choice.

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