[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]
public boolean move(int id, Direction d) {
    ArrayList<Point> temp = getPosition(id);
    if (canMove(temp, d)) {
        for (Point point : temp) {
            matrix[(int) point.getX()][(int) point.getY()] = 0;
        }
        switch(d) {
            case UP:
                for (Point point : temp) {
                    matrix[((int) point.getX()) - 1][(int) point.getY()] = id;
                }
                break;
            case DOWN:
                for (Point point : temp) {
                    matrix[((int) point.getX()) + 1][(int) point.getY()] = id;
                }
                break;
            case RIGHT:
                for (Point point : temp) {
                    matrix[(int) point.getX()][((int) point.getY()) + 1] = id;
                }
                break;
            case LEFT:
                for (Point point : temp) {
                    matrix[(int) point.getX()][((int) point.getY()) - 1] = id;
                }
                break;
        }
        return true;
    } else
        return false;
}

[Buggy Hunk]
if (canMove(temp,d))

[Patch]
if (canMove(temp,d,id))

[Demonstration 3]

[Buggy Method]
private static void findAndPrintLineSegments(Point[] input) {
    Arrays.sort(input);
    int n = input.length;
    Point[] pointsSortedBySlope = Arrays.copyOf(input, n);
    for (int i = 0; i < n - 3; i++) {
        Point p = input[i];
        Arrays.sort(pointsSortedBySlope, p.SLOPE_ORDER);
        double prevSlope = Double.NEGATIVE_INFINITY;
        int sequenceStartIndex = 0;
        for (int j = 1; j < pointsSortedBySlope.length; j++) {
            double slope = p.slopeTo(pointsSortedBySlope[j]);
            if (prevSlope != slope) {
                // slope has changed -- draw the segment, if needed
                // reset trackers
                checkAndDrawLineSegment(p, pointsSortedBySlope, sequenceStartIndex, j - sequenceStartIndex);
                sequenceStartIndex = j;
                prevSlope = slope;
            }
        }
        checkAndDrawLineSegment(p, pointsSortedBySlope, sequenceStartIndex, n - sequenceStartIndex);
    }
}

[Buggy Hunk]
private static void findAndPrintLineSegments(Point[] input) {

[Patch]
static void findAndPrintLineSegments(Point[] input) {