[Demonstration 1]

[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 2]

[Buggy Method]
public void teaC(String h, int randseed) {
    String[] tea = h.split("-");
    for (int i = 0; i < tea.length; i++) {
        System.out.println(tea[i]);
    }
    String result = "tea " + tea[1];
    if (Integer.parseInt(tea[0]) == 1) {
        result += " " + 1;
    } else if (Integer.parseInt(tea[0]) == 2) {
        result += " " + 2;
    } else if (Integer.parseInt(tea[0]) == 3) {
        result += " " + (new Random((long) Math.pow(randseed, 3)).nextInt(2) + 3);
    } else {
        result += " " + (new Random((long) Math.pow(randseed, 3)).nextInt(2) + 5);
    }
    this.com = result;
}

[Buggy Hunk]
String result = "tea " + tea[1];

[Patch]
String result = "addexp";

[Demonstration 3]

[Buggy Method]
@Override
public String toString() {
    String result = opcode;
    result += " l:" + location.getLine() + ", ";
    int argsNum = argumentElements.length;
    for (int i = 0; i < argsNum; ++i) {
        result += argumentElements[i].toString();
        if (i < argsNum - 1) {
            result += ", ";
        }
    }
    return result;
}

[Buggy Hunk]
result += " l:" + location.getLine() + ", ";

[Patch]
result += " @ " + location.toString() + " ";