Vfrdtyky

I am new to the Java module system, and I search to migrate my code to it, creating module-info.java in each project, as soon as they can accept it.

One of the problems I encounter is with resource bundles.
Up to Java 8, I was used to get a property that way for a class A :

ResourceBundle bundle = ResourceBundle.getBundle(A.class.getName(),

       (locale != null) ? locale : Locale.getDefault(), A.class.getClassLoader());

(the underlying cause of this choice was to avoid a big properties file with hundred or thousand messages, difficult to sort. At the time we need to translate a part of our application, we only send the properties files of the objects that have messages that need to be translated in a foreign language.
Our messages coming from properties are not used by a web page, but are written later in reports of a batch process).

However, that code doesn't work anymore when I start its integration into modules, adding a module-info.java in my projects.

A class B from project M2 do some internal checkings. For that it uses some of its base class implementation : A from project M1.

However, when an error is detected it fails now to retrieve the com.mythematic.m1.A bundle leading to the folder where files such as com/mythematic/m1/A.properties, A_fr.properties, A_en.properties... are.

I red the question posted on Stackoverflow (How to get ResourceBundle from another Module in Java 9?) and followed the javadocs of JDK 11 after that.

I attempted to create in my project M1 a new package : com.mythematic.m1.spi containing a AProvider class implementing ResourceBundleProvider.

package com.mythematic.m1.spi;



import java.util.*;

import java.util.spi.*;



/**

 * Resource provider for A.

 */

public class AProvider extends AbstractResourceBundleProvider {

   /** Default property file. */

   public AProvider() {

      super("A.properties");

  }



   @Override

   public ResourceBundle getBundle(String baseName, Locale locale) {

      return super.getBundle(baseName, locale);

   }

}

But my bundle is still not found.
I tried these callings :

ResourceBundle.getBundle(A.class.getName(), (locale != null) ? locale : Locale.getDefault());

ResourceBundle.getBundle(A.class.getName(), (locale != null) ? locale : Locale.getDefault(), A.class.getClassLoader());

ResourceBundle.getBundle(A.class.getName(), (locale != null) ? locale : Locale.getDefault(), A.class.getModule().getClassLoader());

But without success. When an instance of the B class has an error in module M2, the A class in module M1 is still unable to read its own bundle and a debug point sat on return super.getBundle(baseName, locale) doesn't even break on it : My provider is not detected or used.

Over the Internet, I see only the Javadocs of JDK 9 to 11 telling the principles of what has to be done to make ResourceBundleProvider working with a spi package. But I haven't found any sample using them that work at the moment and I don't know what I am missing.

I red somewhere something about opens or uses that should also be added in the module-info.java of my M2 project, but I am a bit lost now.

Have you experienced ResourceBundleProvider already and know how they are to be set in Java 9 - 11 ?
And more than that, if I dare... A working exemple showing a module M2 accessing the ressources of a module M1 ?

Regards,