[Demonstration 1]

[Buggy Method]
@Override
public SCMFileSystem build(@NonNull SCMSource source, @NonNull SCMHead head, @CheckForNull SCMRevision rev) throws IOException, InterruptedException {
    GitHubSCMSource src = (GitHubSCMSource) source;
    String apiUri = src.getApiUri();
    StandardCredentials credentials = Connector.lookupScanCredentials(src.getOwner(), apiUri, src.getScanCredentialsId());
    // Github client and validation
    GitHub github = Connector.connect(apiUri, credentials);
    try {
        github.checkApiUrlValidity();
    } catch (HttpException e) {
        String message = String.format("It seems %s is unreachable", apiUri == null ? GitHubSCMSource.GITHUB_URL : apiUri);
        throw new IOException(message);
    }
    String ref;
    if (head instanceof BranchSCMHead) {
        ref = head.getName();
    } else if (head instanceof PullRequestSCMHead) {
        PullRequestSCMHead pr = (PullRequestSCMHead) head;
        if (!pr.isMerge()) {
            return new GitHubSCMFileSystem(github.getUser(pr.getSourceOwner()).getRepository(pr.getSourceRepo()), pr.getSourceBranch(), rev);
        }
        // TODO support merge revisions somehow
        return null;
    } else {
        return null;
    }
    GHRepository repo = github.getUser(src.getRepoOwner()).getRepository(src.getRepository());
    if (rev == null) {
        rev = new AbstractGitSCMSource.SCMRevisionImpl((BranchSCMHead) head, repo.getBranch(ref).getSHA1());
    }
    return new GitHubSCMFileSystem(repo, ref, rev);
}

[Buggy Hunk]
if (!pr.isMerge()) {

[Patch]
if (!pr.isMerge() && pr.getSourceRepo() != null) {

[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 void ConnectedToServer(Socket server) {
    lblInfo.setText("Connected to" + server.getInetAddress().getHostAddress());
    btnConnect.setEnabled(false);
}

[Buggy Hunk]
lblInfo.setText("Connected to" + server.getInetAddress().getHostAddress());

[Patch]
lblInfo.setText("Connected to" + server.getInetAddress().getHostAddress() + " " + server.getPort());