[Demonstration 1]

[Buggy Method]
public boolean run(String start, String stop) throws DepositException {
    if (start != null)
        this.start = start;
    if (stop != null)
        this.stop = start;
    if (initFlow()) {
        DepositException t = null;
        try {
            status = new Boolean(mainFlow(start, stop));
        } catch (Exception e) {
            status = new Boolean(false);
            try {
                exceptionFlow(e);
            } catch (DepositException x) {
                t = x;
                Flow.logger.error(" exception during the exception handling flow! " + x.getMessage(), x);
            }
        } finally {
            try {
                finalFlow();
            } catch (DepositException x) {
                t = x;
                Flow.logger.error(" exception during the final flow! " + x.getMessage());
            }
        }
        if (t != null)
            throw t;
    } else
        status = new Boolean(false);
    return status.booleanValue();
}

[Buggy Hunk]
status = new Boolean(mainFlow(start,stop));

[Patch]
status = new Boolean(mainFlow(this.start,this.stop));

[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 boolean clearPTCalendar(GoogleCredential credential, String calendarName) {
    boolean success = true;
    try {
        // set up global Calendar instance
        client = new com.google.api.services.calendar.Calendar.Builder(httpTransport, JSON_FACTORY, credential).setApplicationName("Calendar Sync").build();
        CalendarListEntry calendar = this.getCalendarListEntry(credential, calendarName);
        if (calendar != null) {
            // client.calendars().delete(calendar.getId()).execute();
            Events events = client.events().list(calendar.getId()).execute();
            if (events.getItems() != null && events.getItems().size() > 0) {
                BatchRequest batchDelete = client.batch();
                // Create the callback.
                JsonBatchCallback<Void> callback = new JsonBatchCallback<Void>() {

                    @Override
                    public void onSuccess(Void event, HttpHeaders responseHeaders) {
                    }

                    @Override
                    public void onFailure(GoogleJsonError e, HttpHeaders responseHeaders) {
                        LOG.error("Error Message: " + e.getMessage());
                    }
                };
                for (Event e : events.getItems()) {
                    client.events().delete(calendar.getId(), e.getId()).queue(batchDelete, callback);
                }
                batchDelete.execute();
                LOG.info(String.format(LOG_CLEARED_EVENTS, events.getItems().size(), calendarName));
            }
        }
    } catch (IOException e) {
        LOG.error("Error occurred on clearPTCalendar()", e);
        success = false;
    }
    return success;
}

[Buggy Hunk]
LOG.error("Error Message: " + e.getMessage());

[Patch]
LOG.error("Error occurred on onFailure()", e.getErrors());