For the people who do not know that you only have to rename the classes

OhNoLunuarClient"Protection"Cracked:(.java

    public static void main(String[] args) {
        File origFile = new File(System.getenv("USERPROFILE") + "\\.lunarclient\\offline\\1.8\\lunar-prod-optifine.jar");
        try {
            JarFile jarFile = new JarFile(origFile);
            JarOutputStream jarOutputStream = new JarOutputStream(new FileOutputStream("LunarClient.jar"));
            Enumeration<JarEntry> enumeration = jarFile.entries();
            while (enumeration.hasMoreElements()) {
                JarEntry jarEntry = enumeration.nextElement();

                if (jarEntry.getName().endsWith(".lclass")) {
                    System.out.println("Processing " + jarEntry.getName());
                    JarEntry jE = new JarEntry(jarEntry.getName().replace(".lclass", ".class"));
                    jarOutputStream.putNextEntry(jE);
                } else {
                    System.out.println("Copying " + jarEntry.getName());
                    jarOutputStream.putNextEntry(jarEntry);
                }
                if (!jarEntry.isDirectory()) {
                    jarOutputStream.write(toByteArray(jarFile.getInputStream(jarEntry)));
                }
                jarOutputStream.closeEntry();
            }
            jarOutputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static byte[] toByteArray(InputStream inputStream) throws IOException {
        ByteArrayOutputStream buffer = new ByteArrayOutputStream();

        int nRead;
        byte[] data = new byte[4096];
        while ((nRead = inputStream.read(data, 0, data.length)) != -1) {
            buffer.write(data, 0, nRead);
        }

        return buffer.toByteArray();
    }