[Demonstration 1]

[Buggy Method]
public void getAttributesPartTwo(String key, JsonObject json, String resource) {
    JsonArray aux = new JsonArray();
    switch(key) {
        case "entity::property:uri":
            model.add(factory.createStatement(factory.createURI(resource), factory.createURI(schema.get(key)), factory.createLiteral(ACADEMICS_URL + json.get("id").getAsLong())));
            break;
        case "entity::property:creator":
            aux = json.get("authors").getAsJsonArray();
            model.add(factory.createStatement(factory.createURI(resource), factory.createURI(schema.get(key)), factory.createURI(ACADEMICS_URL + aux.get(0).getAsJsonObject().get("id").getAsString())));
            //author name
            model.add(factory.createStatement(factory.createURI(ACADEMICS_URL + aux.get(0).getAsJsonObject().get("id").getAsString()), factory.createURI(schema.get("entity::property:name")), factory.createLiteral(aux.get(0).getAsJsonObject().get("name").getAsString())));
            for (int iterator = 0; iterator < aux.size(); iterator++) {
                JsonElement element = aux.get(iterator);
                model.add(factory.createStatement(factory.createURI(academicsUrl + element.getAsJsonObject().get("id").getAsString()), RDF.TYPE, factory.createURI(schema.get("entity::property::typePerson"))));
            }
            break;
        case "entity::property:contributor":
            aux = json.get("authors").getAsJsonArray();
            for (int iterator = 1; iterator < aux.size(); iterator++) {
                JsonElement element = aux.get(iterator);
                model.add(factory.createStatement(factory.createURI(resource), factory.createURI(schema.get(key)), factory.createURI(ACADEMICS_URL + element.getAsJsonObject().get("id").getAsString())));
                //author name
                model.add(factory.createStatement(factory.createURI(ACADEMICS_URL + element.getAsJsonObject().get("id").getAsString()), factory.createURI(schema.get("entity::property:name")), factory.createLiteral(element.getAsJsonObject().get("name").getAsString())));
            }
            break;
        default:
            break;
    }
}

[Buggy Hunk]
model.add(factory.createStatement(factory.createURI(academicsUrl + element.getAsJsonObject().get("id").getAsString()),

[Patch]
model.add(factory.createStatement(factory.createURI(ACADEMICS_URL + element.getAsJsonObject().get("id").getAsString()),

[Demonstration 2]

[Buggy Method]
@Override
public JsonElement getSerializableElement() {
    JsonObject obj = new JsonObject();
    ResourceLocation item = stack.getItem().getRegistryName();
    int meta = stack.getMetadata();
    int stackSize = stack.stackSize;
    NBTTagCompound tag = stack.getTagCompound();
    obj.add("item", new JsonPrimitive(item.toString()));
    obj.add("stackSize", new JsonPrimitive(stackSize));
    if (meta != 0)
        obj.add("meta", new JsonPrimitive(meta));
    if (tag != null && !tag.hasNoTags()) {
        obj.add("tag", new JsonPrimitive(tag.toString()).getAsJsonObject());
    }
    return obj;
}

[Buggy Hunk]
obj.add("tag", new JsonPrimitive(tag.toString()).getAsJsonObject());

[Patch]
obj.add("tag", new JsonPrimitive(tag.toString()));

[Demonstration 3]

[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));