[Demonstration 1]

[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 2]

[Buggy Method]
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
    //clearing the previous guests list
    guests.clear();
    //iterating through all the nodes
    for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) {
        //need to go to event that is equal to current and to dispaly the list of it
        //getting current event and add the guest to it
        Event event = postSnapshot.getValue(Event.class);
        if (event != null && event.getIdEvent().equals(currentIdEvent)) {
            //get all the guests
            for (DataSnapshot currentGuest : postSnapshot.child("guests").getChildren()) {
                Guest guest = currentGuest.getValue(Guest.class);
                if (null != guest) {
                    if (guest.getRsvp().compareTo("yes") == 0) {
                        counterGuests++;
                    }
                    guests.add(guest);
                }
            }
        }
    }
    //sort the guests list by table number
    order(guests);
    GuestAdapter adpter = new GuestAdapter(getActivity(), guests);
    listViewGuests.setAdapter(adpter);
}

[Buggy Hunk]
if (event != null && event.getIdEvent().equals(currentIdEvent)){

[Patch]
if (event != null && event.getIdEvent().compareTo(currentIdEvent)==0){

[Demonstration 3]

[Buggy Method]
private void saveWeatherInfoToLocal(String description, String icon, String temp, String humidity, String speed) {
    SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
    SharedPreferences.Editor editor = mSharedPreferences.edit();
    editor.putString("description", description);
    editor.putString("icon", icon);
    editor.putString("temp", temp);
    editor.putString("humidity", humidity);
    editor.putString("speed", speed);
    editor.putString("current_time", sdf.format(new Date()));
    editor.apply();
}

[Buggy Hunk]
SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");

[Patch]
SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss", Locale.getDefault());