Get jar locations of all classes extending a given class

ClassUtil.java

import org.reflections.Reflections;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;

import java.net.URL;
import java.util.Set;

public class ClassUtil {

    public <T> MultiValueMap<String, Class<? extends T>> getSubTypeLocationsOf(final String prefix, final Class<T> type) {

        MultiValueMap<String, Class<? extends T>> locations = new LinkedMultiValueMap<>();

        Reflections reflections = new Reflections(prefix);

        Set<Class<? extends T>> modules = reflections.getSubTypesOf(type);

        modules.stream().forEach(c -> {
                    URL resource = c.getResource('/' + c.getName().replace('.', '/') + ".class");
                    String location = getResourceLocation(resource);
                    locations.add(location, c);
                }
        );

        return locations;
    }

    protected String getResourceLocation(URL resource) {

        String withoutClass = resource.toString().replaceAll("(.*)(\\!.*class)", "$1");
        String afterLastSlash = withoutClass.replaceAll("(.*\\/)(.*)", "$2");

        return afterLastSlash;
    }
}

Usage.java

MultiValueMap<String, Class<? extends SpecificRecord>> locations =
                classUtil.getSubTypeLocationsOf("com.droidablebee", SpecificRecord.class);