Java Jar Loader

/**
 *
 * @author Selcuk
 */
public class PluginLoader {

    public ArrayList<String> getClassList(String jarFilePath)
    {
        File jarFile = new File(jarFilePath);
        return getClassList(jarFile);
    }

    public ArrayList<String> getClassList(File jarFile)
    {
        ArrayList<String> classList = new ArrayList<>();
        try {
            JarFile jf = new JarFile(jarFile);
            Enumeration<JarEntry> en = jf.entries();

            while (en.hasMoreElements()) {
                JarEntry entry = new JarEntry(en.nextElement());
                String name = entry.getName();
                if (!entry.isDirectory() && name.toLowerCase().endsWith(".class"))
                {
                    classList.add(name.replace(".class", ""));
                }
            }
        } catch (IOException ex) {
            Logger.getLogger(PluginLoader.class.getName()).log(Level.SEVERE, null, ex);
        }

        return classList;
    }

    public Plugin loadURL(URL pluginUrl, String className)
    {
        Plugin plugin = null;
        URLClassLoader classLoader = new URLClassLoader(new URL[] {pluginUrl}, this.getClass().getClassLoader());
        Class pluginClass = null;
        try {
            System.out.println("Loading plugin class : " + className);
            pluginClass = Class.forName(className, true, classLoader);
            //if (pluginClass.isAssignableFrom(Plugin.class))
            if (Plugin.class.isAssignableFrom(pluginClass))
            {
                plugin = (Plugin) pluginClass.newInstance();
            }
            else
            {
                System.out.println(className + " is not subclass of Plugin");
            }
        } catch (InstantiationException | IllegalAccessException | ClassNotFoundException ex) {
            Logger.getLogger(PluginLoader.class.getName()).log(Level.SEVERE, null, ex);
        }
        return plugin;
    }

    public Plugin loadPlugin(File pluginFile)
    {
        Plugin plugin = null;
        ArrayList<String> classList = getClassList(pluginFile);
        try {
            for (int i = 0; i < classList.size(); i++) {
                plugin = loadURL(pluginFile.toURI().toURL(), classList.get(i).replace("/", "."));
                if (plugin != null)
                    break;
            }
        } catch (MalformedURLException ex) {
            Logger.getLogger(PluginLoader.class.getName()).log(Level.SEVERE, null, ex);
        }

        if (plugin != null)
           plugin.getProperties().setLocation(pluginFile.getPath());

        return plugin;
    }

    public Plugin loadPlugin(String pluginPath)
    {
        File pluginFile = new File(pluginPath);
        return loadPlugin(pluginFile);
    }
}