[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 void setLastIndex() {
    int index = ImageProcessing.TILES_ROW * ImageProcessing.TILES_COL - 1;
    while (isNumber(ar[index - 1])) {
        index--;
    }
    lastIndex = index;
}

[Buggy Hunk]
while(isNumber(ar[index - 1])) {

[Patch]
while(index >= 0 && isNumber(ar[index])) {

[Demonstration 3]

[Buggy Method]
private void newNum() {
    if (isFull()) {
        return;
    }
    final Random random = new Random(System.currentTimeMillis());
    int count = 0;
    while (true) {
        final int id = random.nextInt(ROW * COL);
        final int r = id / ROW;
        final int c = id % COL;
        final Cell cell = mData[r][c];
        if (cell.getNum() != 0) {
            continue;
        }
        if (Math.random() > 0.8) {
            cell.setNum(8);
        } else {
            cell.setNum(2);
        }
        cell.refresh();
        Util.buildScaleTransition(cell).play();
        if (isFull() || (++count) > 0) {
            break;
        }
    }
}

[Buggy Hunk]
cell.setNum(8);

[Patch]
cell.setNum(4);