[Demonstration 1]

[Buggy Method]
private void getQuestions() {
    UnstuckMeApplication.sQuestionsService.getQuestions(new Callback<List<Question>>() {

        @Override
        public void success(List<Question> questions, Response response) {
            mLoadingView.setVisibility(View.GONE);
            mNoResults.setVisibility(View.GONE);
            mRefreshView.setRefreshing(false);
            if (questions.size() == 0) {
                clearViews();
                mNoMorePages = true;
                sendVotesBatch();
                if (mWaitingForQuestions)
                    mNoResults.setVisibility(View.VISIBLE);
                return;
            }
            int size = mQuestionList.size();
            addQuestionsWithoutDuplicates(questions);
            if (mQuestionList.size() == size) {
                mNoResults.setVisibility(View.VISIBLE);
                mNoMorePages = true;
                sendVotesBatch();
                clearViews();
                return;
            }
            if (mWaitingForQuestions) {
                mWaitingForQuestions = false;
                populateNextQuestion();
            }
        }

        @Override
        public void failure(RetrofitError error) {
            Log.e("Error", error.toString());
            mNoResults.setVisibility(View.VISIBLE);
            mLoadingView.setVisibility(View.GONE);
            mRefreshView.setRefreshing(false);
        }
    });
}

[Buggy Hunk]
if (mQuestionList.size() == size) {

[Patch]
if (mQuestionList.size() == size && mQuestionList.size() <= mQuestionIndex) {

[Demonstration 2]

[Buggy Method]
@Override
public long getItemId(int i) {
    return mDataSource.get(i).getID();
}

[Buggy Hunk]
return mDataSource.get(i).getID();

[Patch]
return i;

[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));