FULL PRODUCT VERSION :
Any java 9

java version "9.0.1"
Java(TM) SE Runtime Environment (build 9.0.1+11)
Java HotSpot(TM) 64-Bit Server VM (build 9.0.1+11, mixed mode)

for instance

A DESCRIPTION OF THE PROBLEM :
I'm creating this issue to follow on http://bugs.java.com/bugdatabase/view_bug.do?bug_id=JDK-8190696 which did NOT resolve the bug and abusively closed the ticket.

Factually Java 9 broke a feature for all applications preventing all ALL the code to be migrated on Java 9 and therefore adopt the platform.

There is no technical reason to do that (encapsulation is not technically valid since a custom classloader already breaks it fo rinstance).

This is a significant regression and breakage so please provide a way to fix it and at least a way to plug globally a ResourceBundleProvider (or control provider) to fix that blocking issue.

REGRESSION. Last worked in version 8u162

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Implement a custom ResourceBundleControlProvider and set it up on the JVM.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
All ResourceBundle usages - including named modules - should use the ResourceBundleControlProvider.
ACTUAL -
For named modules it is ignored.

REPRODUCIBILITY :
This bug can be reproduced always.