ADDITIONAL SYSTEM INFORMATION :
Windows 10, JDK 11

A DESCRIPTION OF THE PROBLEM :

Consider the guide:
https://docs.oracle.com/javase/9/migrate/toc.htm#JSMIG-GUID-12F945EB-71D6-46AF-8C3D-D354FD0B1781

which does clearly state that --add-opens should allow JDK-8 applications to work under JDK-9.

The proposed solution does NOT allow to run JDK-8 code loading some internal resources (for an example to provide extract resources necessary to provide missing locales for Swing components) under more modern versions.

REGRESSION : Last worked in version 8

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run below code with:

java --add-opens java.desktop/com.sun.swing.internal.plaf.basic.resources=ALL-UNNAMED X


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Resource should load if:

--adds-open java.desktop/com.sun.swing.internal.plaf.basic.resources=ALL-UNAMED

is specified in command line.
ACTUAL -
java.lang.IllegalAccessException: unnamed module can't load com.sun.swing.internal.plaf.basic.resources.basic in module java.desktop
        at java.base/java.util.ResourceBundle$Control.newBundle(ResourceBundle.java:3184)
        at java.base/java.util.ResourceBundle.loadBundle(ResourceBundle.java:1994)
        at java.base/java.util.ResourceBundle.findBundle(ResourceBundle.java:1776)
        at java.base/java.util.ResourceBundle.findBundle(ResourceBundle.java:1728)
        at java.base/java.util.ResourceBundle.findBundle(ResourceBundle.java:1728)
        at java.base/java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1662)

---------- BEGIN SOURCE ----------
import java.util.*;
public class X
{
public static void main(String [] a)throws Throwable
{
ResourceBundle b = ResourceBundle.getBundle("com.sun.swing.internal.plaf.basic.resources.basic",Locale.US);
};
};
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Downgrade entire system to JDK 8 ?

By the way, please make captcha at https://bugreport.java.com/bugreport/start_form.do not to shak that fast. 0.25 second to see missing first character is a challenge.

FREQUENCY : always