How to update an asset (status and comment) using version one REST data API?

Question

I'm trying to update an asset using data API like below. But I am unable to update it, it is showing an error as Bad request.

String updateIssueData = "{\"Attributes\":{\"Status.Name\":{\"value\":"+"Done"+",\"act\":set}}}";
invokePostMethod("rest-1.v1/Data/Defect/1538",updateIssueData);

private static String invokePostMethod(String url, String data) throws AuthenticationException, ClientHandlerException {
    Client client = Client.create();
    WebResource webResource = client.resource(versionOneBaseURL+url);

    ClientResponse response = webResource.header("Authorization", "Bearer " + fToken).type(MediaType.APPLICATION_JSON).accept(MediaType.APPLICATION_JSON).post(ClientResponse.class,data);

    int statusCode = response.getStatus();
    System.out.println("statuscode::"+statusCode);
    return response.getEntity(String.class);
}