How to get IntelliJ From making annoying blue popups?

Found it! In intellij idea 14, go to

settings -> editor -> general -> auto import, and untick 'show import popup', under the java/kotlin/xml/... section.

That will fix it.

My guess is that you have not configured the Java SDK that your project is using.

File -> Project Structure -> Project -> Project SDK, choose one, make sure it doesn't show in red.