@Override
	public boolean check() {
		Preconditions.checkNotNull(hostname,"host name not null");
		Preconditions.checkNotNull(port,"port not null");
		Preconditions.checkNotNull(delimiter,"delimiter name not null");
		Preconditions.checkNotNull(maxNumRetries,"maxNumRetries name not null");

		Preconditions.checkArgument(port > 0 && port < 65536, "port is out of range");
		Preconditions.checkArgument(maxNumRetries >= -1, "maxNumRetries must be zero or larger (num retries), or -1 (infinite retries)");
		return false;
	}
Reason:
Date: 2018/12/18
Company: www.dtstack.com

@author maqi
serversocket/serversocket-source/src/main/java/com/dtstack/flink/sql/source/serversocket/table/ServersocketSourceTableInfo.java