Google App Engine fiasco :-(

    PushBean response = new PushBean();

    /**
     * A simple endpoint method that takes a name and says Hi back
     */

    @ApiMethod(name = "pushToTopic")

    public PushBean toTopic(@Named("topic") String topic, @Named("dataJson") String dataJson) {

        try{
            response.messageTopic(topic,dataJson);
            return response;
        }catch(Exception e){
            return null;
        }
    }