Use Spring ResourcePatternResolver to find subclasses

ResourcePatternResolverTest.java

@Inject
private ResourceLoader resourceLoader;

@Test
public void processClasses() throws IOException, ClassNotFoundException {
	TypeFilter typeFilter = new AssignableTypeFilter(MyClass.class);
	ResourcePatternResolver resourcePatternResolver = ResourcePatternUtils.getResourcePatternResolver(resourceLoader);
	MetadataReaderFactory metadataReaderFactory = new CachingMetadataReaderFactory(resourceLoader);
	
	String packageSearchPath = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX +
            ClassUtils.convertClassNameToResourcePath("org.my.pckg") +
            "/**/*.class";


	Resource[] resources = resourcePatternResolver.getResources(packageSearchPath);
	for (Resource resource : resources) {
		System.out.println(resource);
		
		MetadataReader metadataReader = metadataReaderFactory.getMetadataReader(resource);
		if (typeFilter.match(metadataReader, metadataReaderFactory)) {
			String className = metadataReader.getClassMetadata().getClassName();
			Class<?> clazz = ClassUtils.forName(className, getClass().getClassLoader());

			processClass(clazz);
		}
	}
}