[Demonstration 1]

[Buggy Method]
protected static byte[] combineByteArrays(byte[] a, byte[] b) {
    byte[] whole = null;
    if (a != null && b != null) {
        whole = new byte[a.length + b.length];
        for (int i = 0; i < a.length; i++) {
            whole[i] = a[i];
        }
        for (int i = 0; i < b.length; i++) {
            whole[i + a.length] = b[i];
        }
    }
    return whole;
}

[Buggy Hunk]
protected static byte[] combineByteArrays(byte[] a, byte[] b){

[Patch]
public static byte[] combineByteArrays(byte[] a, byte[] b){

[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]
public String getRandomSalt() {
    byte[] salt = new byte[16];
    SecureRandom random = new SecureRandom();
    random.nextBytes(salt);
    String saltResult = new String(salt);
    return saltResult;
}

[Buggy Hunk]
String saltResult = new String(salt);

[Patch]
String saltResult = Base64.getEncoder().encodeToString(salt);