[Demonstration 1]

[Buggy Method]
public static Result service(String ownerName, String projectName, String service, boolean isAdvertise) throws IOException, UnsupportedOperationException, ServletException {
    if (!isSupportedService(service)) {
        return forbidden(String.format("Unsupported service: '%s'", service));
    }
    Project project = Project.findByOwnerAndProjectName(ownerName, projectName);
    if (project == null) {
        return notFound();
    }
    models.User user = UserApp.currentUser();
    if (!isAllowed(project, service)) {
        if (user.isAnonymous()) {
            return BasicAuthAction.unauthorized(response());
        } else {
            // If you want the Git client showing your custom message to
            // the user, the Content-Type should be exact "text/plain"
            // without any parameter. For more details, see the code at
            // https://github.com/git/git/commit/426e70d4a11ce3b4f70636d57c6a0ab16ae08a00#diff-eea0ad565ec5903a11b6023755d491cfR154
            response().setHeader("Content-Type", "text/plain");
            return forbidden(String.format("'%s' has no permission to '%s/%s'.", user.name, ownerName, projectName));
        }
    }
    if (isAdvertise) {
        return ok(RepositoryService.gitAdvertise(project, service, response()));
    } else {
        if (request().body().isMaxSizeExceeded()) {
            return status(REQUEST_ENTITY_TOO_LARGE);
        } else {
            user.visits(project);
            return ok(RepositoryService.gitRpc(project, service, request(), response()));
        }
    }
}

[Buggy Hunk]
user.name, ownerName, projectName));

[Patch]
user.loginId, ownerName, projectName));

[Demonstration 2]

[Buggy Method]
private static List<LeveledEnchant> getAllPossibleEnchants(ItemStack item, int modifier) {
    List<LeveledEnchant> enchantments = new ArrayList<>();
    boolean isBook = item.getType() == Material.BOOK;
    for (Enchantment enchantment : Enchantment.values()) {
        if (enchantment.canEnchantItem(item) || isBook) {
            for (int level = enchantment.getStartLevel(); level <= enchantment.getMaxLevel(); level++) {
                if (((GlowEnchantment) enchantment).isInRange(level, modifier)) {
                    enchantments.add(new LeveledEnchant(enchantment, level));
                }
            }
        }
    }
    return enchantments;
}

[Buggy Hunk]
if (enchantment.canEnchantItem(item) || isBook) {

[Patch]
if (isBook || enchantment.canEnchantItem(item)) {

[Demonstration 3]

[Buggy Method]
private ItemStack[] objectToItemStack(MultiInvItem[] itemArray) {
    ItemStack[] items = new ItemStack[itemArray.length];
    int i = 0;
    for (MultiInvItem item : itemArray) {
        if (item == null || item.getQuanitity() == 0) {
            items[i] = null;
            i++;
            continue;
        }
        int id = item.getId();
        int amount = item.getQuanitity();
        short damage = item.getDurability();
        ItemStack stack = new ItemStack(id, amount, damage);
        HashMap<Enchantment, Integer> enchantments = item.getEnchantments();
        if (enchantments.size() > 0) {
            Set<Enchantment> setenchantments = enchantments.keySet();
            for (Enchantment tench : setenchantments) {
                stack.addEnchantment(tench, enchantments.get(tench).intValue());
            }
        }
        items[i] = stack;
        i++;
    }
    return items;
}

[Buggy Hunk]
stack.addEnchantment(tench, enchantments.get(tench).intValue());

[Patch]
stack.addUnsafeEnchantment(tench, enchantments.get(tench).intValue());