Error msg so obscure when connect url port miss

Hi, the problem takes me some time:
when I init InfluxDB instance from InfluxDBFactory.connect, I miss a port, like:

InfluxDBFactory.connect("127.0.0.1", "username", "password");

actually, the code should be

InfluxDBFactory.connect("127.0.0.1:8086", "username", "password");

but I didn't notice it. then I query a table, the program throw exception and show stack trace:

Exception in thread "main" org.influxdb.InfluxDBException: 
	at org.influxdb.InfluxDBException.buildExceptionForErrorState(InfluxDBException.java:175)
	at org.influxdb.impl.InfluxDBImpl.execute(InfluxDBImpl.java:837)
	at org.influxdb.impl.InfluxDBImpl.executeQuery(InfluxDBImpl.java:824)
	at org.influxdb.impl.InfluxDBImpl.query(InfluxDBImpl.java:559)

I think its so obscure, the exception can throw early. For example, when init InfluxDB instance, it can throw IllegalArugemntException: The port cannot be null

InfluxDBFactory.connect から開始し、InfluxDBImpl.execute と executeQuery を通して示されているクエリパスの前にある接続セットアップを追跡します。ポートがない例を再現し、明確な Exception を伴って初期化中に失敗するようにします。既存のクエリパスでは、分かりにくい空の InfluxDBException が発生しないようにします。