[Demonstration 1]

[Buggy Method]
@Override
public synchronized int deleteTasksName(UnmodifiableObservableList<ReadOnlyTask> targets, String toDeleteTaskName) throws TaskNotFoundException {
    int numDeletedTasks = 0;
    saveInstance();
    for (int index = 0; targets.size() != index; index++) {
        try {
            ReadOnlyTask taskToDelete = targets.get(index);
            if (toDeleteTaskName.equals(taskToDelete.getTaskName().fullTaskName)) {
                taskManager.removeTask(taskToDelete);
                index--;
                numDeletedTasks++;
            }
        } catch (TaskNotFoundException pnfe) {
            assert false : "The target task cannot be missing";
        }
    }
    updateFilteredListToShowAll();
    indicateTaskManagerChanged();
    return numDeletedTasks;
}

[Buggy Hunk]
if (toDeleteTaskName.equals(taskToDelete.getTaskName().fullTaskName)) {

[Patch]
if (toDeleteTaskName.equals(taskToDelete.getTaskName().fullTaskName.trim())) {

[Demonstration 2]

[Buggy Method]
@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    // Opens startup page
    if (id == R.id.sign_out) {
        if (mGoogleApiClient.isConnected()) {
            alarmMgr.cancel(alarmIntent);
            Auth.GoogleSignInApi.signOut(mGoogleApiClient).setResultCallback(new ResultCallback<Status>() {

                @Override
                public void onResult(@NonNull Status status) {
                    ((App) getApplication()).getTaskManager().getAllTasks().clear();
                    startActivity(new Intent(getMe(), StartupActivity.class));
                    // [END_EXCLUDE]
                }
            });
        }
    }
    return super.onOptionsItemSelected(item);
}

[Buggy Hunk]
((App) getApplication()).getTaskManager().getAllTasks().clear();

[Patch]
((App) getApplication()).getTaskManager().clear();

[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));