[Demonstration 1]

[Buggy Method]
@Override
public ArrayList<Task> getAllTasks() {
    ArrayList<Task> tasks = new ArrayList<>();
    try (Connection conn = DriverManager.getConnection(this.dbURL, this.username, this.password)) {
        Statement statement = conn.createStatement();
        ResultSet taskSet = statement.executeQuery(SELECT_ALL_TASKS);
        while (taskSet.next()) {
            Task task = new Task(taskSet.getString(1), taskSet.getString(2), taskSet.getDate(3));
            task.setTargetDate(taskSet.getDate(3));
            tasks.add(task);
        }
        System.out.println("Successfully retrieved all tasks");
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return tasks;
}

[Buggy Hunk]
Task task = new Task(taskSet.getString(1), taskSet.getString(2), taskSet.getDate(3));

[Patch]
Task task = new Task(taskSet.getString(1), taskSet.getString(2), taskSet.getDate(4), taskSet.getBoolean(5));

[Demonstration 2]

[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 3]

[Buggy Method]
TodoList generateAddressBook(List<Task> tasks) throws Exception {
    TodoList todoList = new TodoList();
    addToAddressBook(todoList, tasks);
    return todoList;
}

[Buggy Hunk]
TodoList generateAddressBook(List<Task> tasks) throws Exception {

[Patch]
private TodoList generateAddressBook(List<Task> tasks) throws Exception {