Java objects inherit methods from Any

[allanrenucci]

With Dotty:

scala> System.getClass                                                                                                                                                                                          
java.lang.NoClassDefFoundError: java/lang/System$
	at rs$line$1$.<init>(rs$line$1:1)
	...

with Scala 2:

scala> System.getClass
<console>:12: error: value getClass is not a member of object System
Note that System extends Any, not AnyRef.
Such types can participate in value classes, but instances
cannot appear in singleton types or in reference comparisons.
       System.getClass

[smarter]

Note that getClass (and other methods such as hashCode) are defined on Any, so just extending Any instead of AnyRef won't prevent this.

[Jasper-M]

The Scala 2 error doesn't make a lot of sense either.
Scala doesn't treat System as an object. It just has some kind of magical treatment of Java defined classes with static methods.