sparkTutorial | Source code for James Lee 's Aparch Spark with Java course

You can't parse out that list object reasonably well since the numbers are random-ish. You'll need to make that a Map. Otherwise, the rest of the data is parsable by Gson.

You can do it manually like this.

You can try: val airportVertices: RDD[(VertexId, String)] = airportCodes.distinct().map(x => (MurmurHash.stringHash(x(0)), x(1)))

To start the server the doc also mentions:

You can also manually start the server by calling init(). See: http://sparkjava.com/documentation.html#stopping-the-server

Last commit being 4 days ago, I'd bet it is still supported.

See https://github.com/perwendel/spark/

Finally your issue comes from the fact that you need to tell the maven deploy plugin where to deploy exactly with a tag:

To enable this mojo to function, you must include a valid section POM

See: http://maven.apache.org/plugins/maven-deploy-plugin/usage.html

As for a lightweight database, I use hsqldb but then I guess that's more of a matter of taste.

The following is the code:

I don't think you need to use a filter. A filter is used when you need to check something, in different cases..

In your case, you need to check the body when it is the POST request (for example, I don't know what is your case exactly)

That filter, as you mentioned, is being called twice because of the OPTIONS and the POST request.

What you should do is move the validation to the method where you receive the request. For example something like: