[Demonstration 1]

[Buggy Method]
@Override
public AioConnection aioConnect(Action action, Gateway gateway, AioClient client) throws IOException {
    AioConnection connection = (AioConnection) action.getExtra().get(AioConnection.class);
    if (connection != null) {
        return connection;
    }
    for (Connector connector : connectors.values()) {
        if (connector.supports(action) && connector instanceof AioConnection) {
            AioConnector aioConnector = (AioConnector) connector;
            connection = aioConnector.aioConnect(action, gateway, this);
            action.getExtra().put(AioConnection.class, connection);
            return connection;
        }
    }
    throw new IOException("unsupported protocol " + action.getProtocol());
}

[Buggy Hunk]
if (connector.supports(action) && connector instanceof AioConnection) {

[Patch]
if (connector.supports(action) && connector instanceof AioConnector) {

[Demonstration 2]

[Buggy Method]
@RequestMapping(path = "/get-id", method = { RequestMethod.GET }, produces = { "application/json;charset=UTF-8" })
@ResponseBody
public ResultModel getId(String useragent) {
    if (!validUseragent(useragent)) {
        ResultModel resultModel = new ResultModel();
        resultModel.setCode(ErrorCode.NOT_AUTH_ERROR.getCode());
        resultModel.setMsg(ErrorCode.NOT_AUTH_ERROR.getDesc());
        reporter.incr("validUseragentExceptions");
        return resultModel;
    }
    ResultModel resultModel = ResultResolver.sendNormalResult(ImmutableMap.of("id", snowflakeService.generateId()));
    reporter.incr("ids_generated");
    reporter.incr("ids_generated_" + useragent);
    return resultModel;
}

[Buggy Hunk]
public ResultModel getId(String useragent) {

[Patch]
public ResultModel getId(@RequestParam("useragent") String useragent) {

[Demonstration 3]

[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));