I had an issue with a builder. I had used it like this:

reportCreator.start(game, raceId).type(PlanetHasBuiltMinesReport.class)
		.addArguments(name, numberOfItems);

My Test showed that it was not working - the report was not created - and it took me a while to find the cause. It should have been:

reportCreator.start(game, raceId).type(PlanetHasBuiltMinesReport.class)
		.addArguments(name, numberOfItems).create();

As you can see, the omission is hard to spot.

So I think, maybe one should always pass a parameter with the last method - so that the call is not forgotten.

reportCreator.start(game, raceId)
		.addArguments(name, numberOfItems)
		.create(PlanetHasBuiltMinesReport.class);

Looks strange?