[Demonstration 1]

[Buggy Method]
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View root = inflater.inflate(R.layout.fragment_newslist, container, false);
    mRecyclerView = root.findViewById(R.id.recyclerView);
    mAdapter = new NewsListAdapter(getContext(), new ArrayList<News>(0));
    mRecyclerView.setAdapter(mAdapter);
    SwipeRefreshLayout refreshLayout = root.findViewById(R.id.swipeRefreshLayout1);
    mLayoutManager = new LinearLayoutManager(getContext());
    mLayoutManager.setOrientation(OrientationHelper.VERTICAL);
    mLayoutManager.setOrientation(OrientationHelper.VERTICAL);
    mRecyclerView.setLayoutManager(mLayoutManager);
    mRecyclerView.setHasFixedSize(true);
    // 实现底部上拉刷新
    mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {

        @Override
        public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
            super.onScrollStateChanged(recyclerView, newState);
            if (newState == RecyclerView.SCROLL_STATE_IDLE && lastVisibleItem + 1 == mAdapter.getItemCount()) {
                // 不需要向上更新新闻，只需要向下读取内容，因此为false.
                mPresenter.loadNews(mPage + 1, mCategory, false);
                //Toast.makeText(activity-context, "加载成功", Toast.LENGTH_SHORT).show();
            }
        }

        @Override
        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
            super.onScrolled(recyclerView, dx, dy);
            lastVisibleItem = mLayoutManager.findLastVisibleItemPosition();
        }
    });
    // 实现顶部上拉刷新(其实没有刷新23333)
    refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {

        @Override
        public void onRefresh() {
            // 其实应该改成true，但是没有关系，因为老师的数据库不会更新.
            mPresenter.loadNews(0, mCategory, false);
        }
    });
    mAdapter.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(View view, int position) {
            Intent intent = new Intent();
            intent.setClass(getContext(), NewsPageActivity.class);
            Bundle bundle = new Bundle();
            bundle.putParcelable("news", mAdapter.getItem(position));
            intent.putExtras(bundle);
            startActivity(intent);
        }
    });
    return root;
}

[Buggy Hunk]
mPresenter.loadNews(0, mCategory, false);

[Patch]
mPresenter.loadNews(1, mCategory, false);

[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]
public void parseItemLots() {
    Log.d(TAG, "parse item lots started");
    try {
        String uname, passw;
        if (LOGGED_IN_USERNAME == null || LOGGED_IN_USER_PASS == null) {
            List<User> allUsers = databaseInstance.getAllUsers();
            User user = allUsers.get(0);
            uname = user.getUsername();
            passw = user.getPassword();
        } else {
            uname = LOGGED_IN_USERNAME;
            passw = LOGGED_IN_USER_PASS;
        }
        client.setBasicAuth(uname, passw, true);
        final StringBuilder webServiceUrl = createWebServiceURL(LOGGED_IN_USER_HF_ID, GET_ITEM_LOT_ID);
        Log.d("", webServiceUrl.toString());
        RequestHandle message = client.get(webServiceUrl.toString(), new TextHttpResponseHandler() {

            @Override
            public void onFailure(int statusCode, Header[] headers, String responseString, Throwable throwable) {
            }

            @Override
            public void onSuccess(int statusCode, Header[] headers, String response) {
                List<ItemLot> objects = new ArrayList<ItemLot>();
                try {
                    Utils.writeNetworkLogFileOnSD(Utils.returnDeviceIdAndTimestamp(getApplicationContext()) + response);
                    ObjectMapper mapper = new ObjectMapper();
                    mapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
                    objects = mapper.readValue(response, new TypeReference<List<ItemLot>>() {
                    });
                } catch (JsonGenerationException e) {
                    e.printStackTrace();
                } catch (JsonMappingException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                } finally {
                    for (ItemLot object : objects) {
                        ContentValues values = new ContentValues();
                        values.put(SQLHandler.ItemLotColumns.ID, object.getId());
                        values.put(SQLHandler.ItemLotColumns.EXPIRE_DATE, object.getExpireDate());
                        values.put(SQLHandler.ItemLotColumns.GTIN, object.getGtin());
                        values.put(SQLHandler.ItemLotColumns.ITEM_ID, object.getItemId());
                        values.put(SQLHandler.ItemLotColumns.LOT_NUMBER, object.getLotNumber());
                        //values.put(SQLHandler.ItemLotColumns.NOTES, object.getNotes());
                        DatabaseHandler db = getDatabaseInstance();
                        db.addUpdateItemLot(values, object.getId());
                    }
                }
            }
        });
    } catch (Exception e) {
        e.printStackTrace();
    }
    Log.d(TAG, "parse itemlots finished");
}

[Buggy Hunk]
Log.d("", webServiceUrl.toString());

[Patch]
Log.d(TAG,"parsing item lots : "+ webServiceUrl.toString());