[Scan all sub classes by ClassPathScanningCandidateComponentProvider] #spring

SubClassesScanner.java

ClassPathScanningCandidateComponentProvider provider = new ClassPathScanningCandidateComponentProvider(false);
provider.addIncludeFilter(new AssignableTypeFilter(MyClass.class));

// scan in org.example.package
Set<BeanDefinition> components = provider.findCandidateComponents("org.example.package");
for (BeanDefinition component : components) {
    Class cls = Class.forName(component.getBeanClassName());
    // use class cls found
}