- [ ] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.
- [ ] I have checked the [FAQ](https://github.com/apache/dubbo/blob/master/FAQ.md) of this repository and believe that this is not a duplicate.

### Environment

* Dubbo version: xxx
* Operating System version: xxx
* Java version: xxx

### Steps to reproduce this issue

![image](https://user-images.githubusercontent.com/8758457/59562427-2e06c800-905f-11e9-9bff-9ea54d87fc6d.png)
![image](https://user-images.githubusercontent.com/8758457/59562435-51317780-905f-11e9-930b-a66bc866ccf1.png)


Pls. provide [GitHub address] to reproduce this issue.

### Expected Result

What do you expected from the above steps？

### Actual Result

What actually happens?

If there is an exception, please attach the exception trace:

```
Just put your stack trace here!
```

public int getTimeToLive() {
            return (int) timeToLiveMillis / 1000;
        }
        /**
         * update time to live
         *
         * @param timeToLive time to live
         */
        public void setTimeToLive(long timeToLive) {
            this.timeToLiveMillis = timeToLive * 1000;
        }
        /**
         * get expiration interval
         *
         * @return expiration interval (second)
         */
        public int getExpirationInterval() {
            return (int) expirationIntervalMillis / 1000;
        }
        /**
         * set expiration interval
         *
         * @param expirationInterval expiration interval (second)
         */
        public void setExpirationInterval(long expirationInterval) {
            this.expirationIntervalMillis = expirationInterval * 1000;
        }
    }
}