[Demonstration 1]

[Buggy Method]
public byte[] receive(Socket s) throws Exception {
    int type = readInt(s.getInputStream());
    if ((type & STRING) == STRING) {
        int length = readInt(s.getInputStream());
        String str = "";
        int c;
        for (int i = 0; i < length; i++) {
            c = s.getInputStream().read();
            str += (char) c;
        }
        if ((type & ERROR) == ERROR) {
            throw new Exception(str);
        } else {
            return str.getBytes();
        }
    } else {
        int data = readInt(s.getInputStream());
        return (data + "").getBytes();
    }
}

[Buggy Hunk]
throw new Exception(str);

[Patch]
throw new ServerException(str);

[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]
@Override
public InputStream readContent(int timeout) throws AtsdException, GeneralSecurityException, IOException {
    contentDescription.addRequestHeadersForDataFetching();
    InputStream inputStream = null;
    try {
        inputStream = executeRequest(POST_METHOD, timeout, contentDescription.getHost());
        if (MetadataFormat.EMBED.name().equals(contentDescription.getMetadataFormat())) {
            inputStream = MetadataRetriever.retrieveJsonSchemeAndSubstituteStream(inputStream, contentDescription);
        }
    } catch (IOException e) {
        if (logger.isDebugEnabled()) {
            logger.debug("Metadata retrieving error", e);
        }
        if (queryId != null) {
            throw new AtsdRuntimeException(prepareCancelMessage());
        }
        if (e instanceof SocketException) {
            throw e;
        }
    }
    return inputStream;
}

[Buggy Hunk]
inputStream = executeRequest(POST_METHOD, timeout, contentDescription.getHost());

[Patch]
inputStream = executeRequest(POST_METHOD, timeout, contentDescription.getEndpoint());