[Demonstration 1]

[Buggy Method]
@Test
public void testCompletableFuture_CombineAllTransformedImages() {
    long start = System.nanoTime();
    CompletableFuture<Void> future = imageNames.stream().map(imageName -> CompletableFuture.supplyAsync(() -> getRawImage(imageName), executor)).map(imageDataFuture -> imageDataFuture.thenCompose(imageData -> CompletableFuture.supplyAsync(() -> getTransformedImage(imageData), executor))).reduce(CompletableFuture.completedFuture(new TransformedImage(null, "")), (tf1, tf2) -> tf1.thenCombineAsync(tf2, ImageService::combineTransformedImages, executor)).thenApply(ImageService::getScaledImage).thenAccept(ImageService::renderImage);
    future.join();
    System.out.println(String.format("\nFinished rendering final image. Total time: %dms", getTimeSince(start)));
}

[Buggy Hunk]
CompletableFuture.completedFuture(new TransformedImage(null, "")),

[Patch]
CompletableFuture.completedFuture(new TransformedImage()),

[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]
protected D6ResponseMessage request(TestRequest req) throws MalformedURLException {
    switch(version) {
        case 1:
            return requestV1(req);
        case 2:
            return requestV2(req);
        case 3:
            return requestV3(req);
    }
    return null;
}

[Buggy Hunk]
protected D6ResponseMessage request(TestRequest req) throws MalformedURLException {

[Patch]
protected D6ResponseMessage request(TestRequest req) throws MalformedURLException, ServiceException {