danijelz

**Is your feature request related to a problem? Please describe.** It's impossible to create ticks with labels on it.

##### Description When System Properties contain non String keys, the following exception is thrown: ``` java.lang.ClassCastException: class java.util.concurrent.locks.ReentrantLock cannot be cast to class java.lang.String (java.util.concurrent.locks.ReentrantLock and java.lang.String are in module...