#fixed code
                                private void publishMessage(int action, String cacheName, Object key) {
        JbootEhredisMessage message = new JbootEhredisMessage(clientId, action, cacheName, key);
        redis.publish(serializer.serialize(channel), serializer.serialize(message));
    }
#vulnerable code 
                                private void publishMessage(int action, String cacheName, Object key) {
        Jboot.me().getMq().publish(new JbootEhredisMessage(clientId, action, cacheName, key), channel);
    } 
                            #location 2 
                            #vulnerability type NULL_DEREFERENCE