java class finder with jar package

ClassFinder.java

public class ClassFinder {
    private static final char PKG_SEPARATOR = '.';
    private static final char DIR_SEPARATOR = '/';
    private static final String CLASS_FILE_SUFFIX = ".class";
    private static final String BAD_PACKAGE_ERROR = "Unable to get resources from path '%s'. Are you sure the package '%s' exists?";
    private static Logger logger = Logger.getLogger(ClassFinder.class);

    /**
     * scannedPackage: com.foo.bar
     *
     * @param scannedPackage
     * @return
     * @throws IOException
     * @throws ClassNotFoundException
     */
    public static List<Class<?>> find(String scannedPackage) throws IOException, ClassNotFoundException {
        List<Class<?>> classes = new ArrayList<Class<?>>();
        String scannedPath = scannedPackage.replace(PKG_SEPARATOR, DIR_SEPARATOR);
        logger.debug("scanned path : " + scannedPath);
        URL scannedUrl = Thread.currentThread().getContextClassLoader().getResource(scannedPath);
        if (scannedUrl == null) {
            throw new IllegalArgumentException(String.format(BAD_PACKAGE_ERROR, scannedPath, scannedPackage));
        }
        logger.debug("scanned url : " + scannedUrl);
        if (scannedUrl.toString().startsWith("jar:")) { //jar
            String fullPath = scannedUrl.getFile();
            logger.debug("full path : " + fullPath);
            String jarPath = fullPath.replaceFirst("[.]jar[!].*", ".jar").replaceFirst("file:", "");
            logger.debug("jar path : " + jarPath);
            JarFile jarFile = new JarFile(jarPath);
            Enumeration<JarEntry> entries = jarFile.entries();
            while (entries.hasMoreElements()) {
                JarEntry jarEntry = entries.nextElement();
                if (jarEntry == null) {
                    break;
                }
                if (jarEntry.getName().endsWith(".class")) {
                    String name = jarEntry.getName().replaceAll("/", "\\.").replace(".class","");
                    logger.debug("class name : " + name);
                    classes.add(Class.forName(name));
                }
            }
        } else {
            File scannedDir = new File(scannedUrl.getFile());
            for (File file : scannedDir.listFiles()) {
                classes.addAll(find(file, scannedPackage));
            }
        }

        return classes;
    }

    private static List<Class<?>> find(File file, String scannedPackage) {
        List<Class<?>> classes = new ArrayList<Class<?>>();
        String resource = scannedPackage + PKG_SEPARATOR + file.getName();
        if (file.isDirectory()) {
            for (File child : file.listFiles()) {
                classes.addAll(find(child, resource));
            }
        } else if (resource.endsWith(CLASS_FILE_SUFFIX)) {
            int endIndex = resource.length() - CLASS_FILE_SUFFIX.length();
            String className = resource.substring(0, endIndex);
            try {
                classes.add(Class.forName(className));
            } catch (ClassNotFoundException ignore) {
            }
        }
        return classes;
    }
}