Apps built on Mendix 6.10.7 already have to run on JDK 1.8, so in that case there is no difference with Mendix 7.
However, to run Mendix 7 apps, you need Service Console 4.5. You can safely install this version of the Mendix Service Console. Mendix Service Console 4.5 is able to manage concurrently different Mendix apps from Mendix 3 to 7 with JDK 6, 7 or 8 at the same time on the same server. Per app, you can configure which JDK to use.