[Demonstration 1]

[Buggy Method]
public void fetchFromURL(String url) {
    if (cacheContainer.containsKey(url)) {
        byte[] cached = cacheContainer.get(url);
        removeFromCache(url);
        // update key value priority in the LinkedHashMap
        cache(url, cached);
        onRawResponse(new ByteArrayInputStream(cached));
        return;
    }
    Bundle bundle = new Bundle();
    bundle.putString("url", url);
    ((Activity) context).getLoaderManager().initLoader(url.hashCode(), bundle, loaderCallbacks).forceLoad();
}

[Buggy Hunk]
public void fetchFromURL(String url) {

[Patch]
public synchronized void fetchFromURL(String url) {

[Demonstration 2]

[Buggy Method]
public static String generateSAMLRequestSignature(final String urlEncodedString, final PrivateKey signingKey, final String sigAlgorithmName) throws NoSuchAlgorithmException, SignatureException, InvalidKeyException, UnsupportedEncodingException {
    if (signingKey == null) {
        return urlEncodedString;
    }
    String opensamlAlgoIdSignature = SignatureConstants.ALGO_ID_SIGNATURE_RSA_SHA1;
    String javaSignatureAlgorithmName = "SHA1withRSA";
    if (sigAlgorithmName.equalsIgnoreCase("SHA256")) {
        opensamlAlgoIdSignature = SignatureConstants.ALGO_ID_SIGNATURE_RSA_SHA256;
        javaSignatureAlgorithmName = "SHA256withRSA";
    } else if (sigAlgorithmName.equalsIgnoreCase("SHA384")) {
        opensamlAlgoIdSignature = SignatureConstants.ALGO_ID_SIGNATURE_RSA_SHA384;
        javaSignatureAlgorithmName = "SHA384withRSA";
    } else if (sigAlgorithmName.equalsIgnoreCase("SHA512")) {
        opensamlAlgoIdSignature = SignatureConstants.ALGO_ID_SIGNATURE_RSA_SHA512;
        javaSignatureAlgorithmName = "SHA512withRSA";
    }
    String url = urlEncodedString + "&SigAlg=" + URLEncoder.encode(opensamlAlgoIdSignature, HttpUtils.UTF_8);
    Signature signature = Signature.getInstance(javaSignatureAlgorithmName);
    signature.initSign(signingKey);
    signature.update(url.getBytes());
    String signatureString = Base64.encodeBytes(signature.sign(), Base64.DONT_BREAK_LINES);
    if (signatureString != null) {
        return url + "&Signature=" + URLEncoder.encode(signatureString, HttpUtils.UTF_8);
    }
    return url;
}

[Buggy Hunk]
signature.update(url.getBytes());

[Patch]
signature.update(url.getBytes(Charset.forName("UTF-8")));

[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));