[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]
@RabbitListener(queues = "${rss_reader_database_queue}")
public void consumeMessage(Message message) throws InterruptedException, IOException {
    List<NewsMessage> newsMessages = messageTransformer.getNewsMessages(message, newsTypeHeader);
    newsMessageRepository.save(new ArrayList<>(newsMessages));
}

[Buggy Hunk]
newsMessageRepository.save(new ArrayList<>(newsMessages));

[Patch]
newsMessages.stream().forEach(e -> newsMessageRepository.save(e));

[Demonstration 3]

[Buggy Method]
@PostConstruct
public void init() {
    if (retryDecider == null) {
        retryDecider = new RetryDecider();
    }
    if (deadLetterPublishingMessageRecoverer == null) {
        deadLetterPublishingMessageRecoverer = new DeadLetterPublishingMessageRecoverer(rabbitTemplate, queues);
    }
}

[Buggy Hunk]
deadLetterPublishingMessageRecoverer = new DeadLetterPublishingMessageRecoverer(rabbitTemplate, queues);

[Patch]
deadLetterPublishingMessageRecoverer = new DeadLetterPublishingMessageRecoverer(rabbitTemplate, beanFactory);