[Demonstration 1]

[Buggy Method]
public static boolean insertBooking(int user_id, int car_id, String start_date, String start_time, double start_lat, double start_lng) {
    Sql2o sql2o = new Sql2o(sqlDB, sqlUser, sqlPass);
    String sql = "insert into bookings (user_id, car_id, start_date, start_time, start_lat, start_lng)" + "values (:user_id, :car_id, :start_date, :start_time, :start_lat, :start_lng)";
    try (Connection con = sql2o.open()) {
        con.createQuery(sql).addParameter("user_id", user_id).addParameter("car_id", car_id).addParameter("start_date", start_date).addParameter("start_time", start_time).addParameter("start_lat", start_lat).addParameter("start_lng", license_no).executeUpdate();
    }
    return true;
}

[Buggy Hunk]
.addParameter("start_lng", license_no)

[Patch]
.addParameter("start_lng", start_lng)

[Demonstration 3]

[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));