Extending java.base module

[Michael Rasmussen]

>
> E.g. if I need to register/reach my service already at the early stages of
> JVM initialization, e.g. when a class java.lang.Thread gets initialized,
> can I assume a service from my extension module would be available?
>
No. At that time only java.base classes can be loaded.

If you look at the comments in the initPhase# methods in System, it gives
some good info about when things are initialized.

http://hg.openjdk.java.net/jdk9/jdk9/jdk/file/tip/src/java.base/share/classes/java/lang/System.java#l1850

/Michael