[Demonstration 1]

[Buggy Method]
public static void main(String[] args) {
    Environment environment = new Environment();
    environment.addEntity(new RedEntity(environment));
    environment.addEntity(new RedEntity(environment, 1, 5));
    environment.addEntity(new RedEntity(environment, 20, 15));
    environment.addEntity(new RedEntity(environment, 10, 10));
    environment.addEntity(new GreenEntity(environment, 10, 4));
    new MainFrame(environment);
}

[Buggy Hunk]
environment.addEntity(new GreenEntity(environment, 10, 4));

[Patch]
environment.addEntity(new RedEntity(environment, 2, 5));

[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 void doUpload() {
    UploadFile uploadFile = getFile();
    if (null != uploadFile) {
        String newPath = AttachmentUtils.moveFile(uploadFile);
        User user = getLoginedUser();
        Attachment attachment = new Attachment();
        attachment.setUserId(user.getId());
        attachment.setCreated(new Date());
        attachment.setTitle(uploadFile.getOriginalFileName());
        attachment.setPath(newPath.replace("\\", "/"));
        attachment.setSuffix(FileUtils.getSuffix(uploadFile.getFileName()));
        attachment.setMimeType(uploadFile.getContentType());
        attachment.save();
        processImage(newPath);
        JSONObject json = new JSONObject();
        json.put("success", true);
        json.put("src", getRequest().getContextPath() + newPath);
        renderJson(json.toString());
    } else {
        renderJson("success", false);
    }
}

[Buggy Hunk]
json.put("src", getRequest().getContextPath() + newPath);

[Patch]
json.put("src", getRequest().getContextPath() + attachment.getPath());