Java error java.util.concurrent.ConcurrentHashMap.keySet

Question

Hey guy\'s am getting this error: Can you guy\'s possibly try to fix this? or see whats wrong post a fix or something

Thanks alot guy\'s :)

Exceptio         


        

Answer 1

Looks like you have a library which need java8 and you run under a version lower than 8.

In java 8 the api has changed:

In java 8 the keySet method returned an object

ConcurrentHashMap.KeySetView

In java 7

Set