IntelliJ IDEA can't setup JDK

Question

I\'m trying to setup JDK in IntelliJ IDEA and whatever I do, or whatever JDK version I select, nothing happens. The following situation remains:

Answer 1

I was seeing this exception in the console:

NoClassDefFoundError: com/intellij/remote/RemoteSdkConnectionAcceptor

which was caused by the python community edition plugin on Intellij IDEA 2016.2.5.

After updateing/disableing the plugin, I was able to setup the SDK again.