[Demonstration 1]

[Buggy Method]
public AccessToken tradeAccessTokenWithCode(String code) throws DoubanException {
    try {
        Map<String, String> params = new HashMap<String, String>();
        params.put("client_id", this.apiKey);
        params.put("client_secret", this.secretKey);
        params.put("redirect_uri", DefaultConfigs.ACCESS_TOKEN_REDIRECT_URL);
        params.put("grant_type", "authorization_code");
        params.put("code", code);
        String responseStr = new HttpManager().postEncodedEntry(DefaultConfigs.ACCESS_TOKEN_URL, params, false);
        return Converters.stringToAccessToken(responseStr);
    } catch (UnsupportedEncodingException ex) {
        throw ErrorHandler.getCustomDoubanException(100, "Exception in trading access token : " + ex.toString());
    } catch (IOException ex) {
        throw ErrorHandler.getCustomDoubanException(100, "Exception in trading access token : " + ex.toString());
    }
}

[Buggy Hunk]
params.put("redirect_uri", DefaultConfigs.ACCESS_TOKEN_REDIRECT_URL);

[Patch]
params.put("redirect_uri",  this.redirectUrl);

[Demonstration 2]

[Buggy Method]
public static CorpUserDetail getUserInfo(String accessToken, String code) throws Exception {
    CorpUserService corpUserService = ServiceFactory.getInstance().getOpenService(CorpUserService.class);
    return corpUserService.getUserinfo(accessToken, code);
}

[Buggy Hunk]
public static CorpUserDetail getUserInfo(String accessToken, String code) throws Exception{

[Patch]
public static CorpUserBaseInfo getUserInfo(String accessToken, String code) throws Exception{

[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));