Question: Use from Java app

I'm using your `docker-compose.yml` in a Docker container.

How can I setup a SparkSession?
```
	SparkSession spark = SparkSession
			.builder()
			.appName("Java Spark SQL basic example")
			.master("spark://master:7077")
				.getOrCreate();
```

I actually set in `etc/hosts` master as the docker machine IP.

The one above does not seem to work.