This is made more exciting by the fact that Java rarely introduced big breaking changes in the past. Especially deprecated classes (java.util.Date...) never were actually removed. Starting this now is going to wreak havoc.
We're already starting to see the effects in Java 9. Our team attempted to use it on our current project and many of our dependencies broke because they were using deprecated parts of the API that were removed. We ended up having to drop back to Java 8.
