src/java.desktop/macosx/classes/sun/awt/CGraphicsEnvironment.java has a finalize method to free a native display config handler.
This can be converted to use 2D disposer.

However since CGraphicsEnvironment.java is a singleton and it lives as long as the application lives, in practice, it will never be called.
System.exit(0) will happen before it ever does.

But it should be kept for completeness.