Setting JDK for multiple Maven Projects in NetBeans 8.1

After I had problems, starting my NetBeans on Windows 8.1 PRO with a whole bunch of maven-projects, I removed everything in my Home-Directory from Netbeans and started from a fresh

There is a plugin, I didn't recognize before: Set JDK for Maven projects.

After installing this plugin, you can select multiple projects in the Projects-Window and do a right-click.

Select the "Set JDK" and you can select which JDK should be used for the maven projects.

The JDK's have to be configured under Tools/Java Platforms