springboot Build does not compile docs example java source

It's currently hard to write asciidoc example code in eclipse because the /src... folders aren't imported and there's no classpath.

Comment From: snicoll

~That was the case in IntelliJ IDEA for me at some point but it seems to be working now, no idea what changed.~

Edit: I was looking at the 2.2.x branch so it applies to IntelliJ IDEA too.

Comment From: wilkinsona

There's no source set defined so there's nothing for the IDE to import. That also means that the code isn't getting compile at the moment as part of the build. I don't understand how it can be working in IDEA as the project doesn't define the dependencies that are required for the code to compile.