[Demonstration 1]

[Buggy Method]
public void save(final WorkoutSaveCallback callback) {
    WorkoutExercise workoutExercise = (WorkoutExercise) spWorkout.getSelectedItem();
    if (workoutExercise != null) {
        String hour = ((String) spHour.getSelectedItem());
        if (hour != null) {
            hour = SelectedWorkout.getTimeKey(hour);
        }
        if (selectedWorkout != null) {
            int index = selectedWorkouts.lastIndexOf(selectedWorkout);
            selectedWorkout = new SelectedWorkout(workoutExercise, hour);
            selectedWorkouts.set(index, selectedWorkout);
        } else {
            if (workoutExercise != null) {
                selectedWorkout = new SelectedWorkout(workoutExercise, hour);
                selectedWorkouts.add(selectedWorkout);
            }
        }
        SharedPrefsUtil.setBooleanPreference(getActivity(), selectedWorkout.getTimeKey(), true);
        SharedPrefsUtil.setStringPreference(getActivity(), "list_" + selectedWorkout.getTimeKey(), selectedWorkout.getId());
        SelectedWorkout savedWorkout = application.getDbHelper().getSelectedWorkoutByTime(selectedWorkout.getTimeMeridian());
        if (savedWorkout == null || !savedWorkout.getId().equals(selectedWorkout.getId())) {
            String url = new UrlBuilder(UrlBuilder.API_PRODUCTS).addParameters("workout_time", selectedWorkout.getTimeMeridian()).addParameters("category", selectedWorkout.getCategory().getId()).addParameters("workout", selectedWorkout.getId()).addParameters("user_id", application.getUserId()).build();
            HttpTask httpTask = new HttpTask(true, getActivity(), HttpTask.METHOD_POST);
            httpTask.setAuthorizationRequired(true, new HttpTask.SessionTimeOutListener() {

                @Override
                public void onSessionTimeout() {
                    startActivity(Utils.getSessionTimeoutIntent(getActivity()));
                }
            });
            httpTask.setmCallback(new HttpTask.HttpCallback() {

                @Override
                public void onResponse(String response) throws JSONException {
                    JSONObject jsonObject = new JSONObject(response);
                    application.getDbHelper().insertSelectedWorkout(jsonObject);
                    if (callback != null) {
                        callback.onSave();
                    }
                }

                @Override
                public void onException(Exception e) {
                }
            });
            httpTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, url);
        } else {
            if (callback != null) {
                callback.onSave();
            }
        }
    }
}

[Buggy Hunk]
application.getDbHelper().insertSelectedWorkout(jsonObject);

[Patch]
application.getDbHelper().insertSelectedWorkout(jsonObject, false, true);

[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]
@ResponseBody
@RequestMapping(value = "/detail")
public String getProduct(String id) {
    Product result = productService.getProduct(id);
    JSONObject jsonObject = new JSONObject();
    if (result != null) {
        jsonObject.put(SysConstants.CODE, SysConstants.RESULT_OK);
        jsonObject.put(SysConstants.MSG, "");
        jsonObject.put(SysConstants.DATA, new JSONObject(result));
    } else {
        jsonObject.put(SysConstants.CODE, -1);
        jsonObject.put(SysConstants.MSG, "get product failed");
        jsonObject.put(SysConstants.DATA, "");
    }
    return jsonObject.toString();
}

[Buggy Hunk]
jsonObject.put(SysConstants.CODE, -1);

[Patch]
jsonObject.put(SysConstants.CODE, SysConstants.RESULT_NONE);