FULL PRODUCT VERSION :
java version "1.5.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-b64)
Java HotSpot(TM) Client VM (build 1.5.0-b64, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Widows XP Pro / sp1

A DESCRIPTION OF THE PROBLEM :
When the default locale is the same language (but different country code) as the requested locale for a call to ResourceBundle.getBundle(), and a bundle exists for the default locale, the default bundle will NOT be chosen. Instead the root bundle will be chosen.

Example:
If my default locale is en_US and I have the following bundles:
MessagesBundle.properties
MessagesBundle_en_US.properties

and if I try to retrieve a bundle using the Locale.UK (en_GB), I will get back the MessagesBundle.properties bundle, NOT the MessagesBundle_en_US.properties bundle.

I would expect that if I have a bundle that matches the default locale and I try to retrieve a bundle with a locale that I DO NOT have a bundle for, then the default bundle will be retrieved, and not the Root bundle. (see Steps to Reproduce for example program)

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Setup the following bundles:

MessagesBundle_en_US.properties:
greetings = Hello.
farewell = Goodbye.
inquiry = How are you?

MessagesBundle.properties:
greetings = Hiya.
farewell = Seeya.
inquiry = How you doing?

Use the following Java class:
import java.util.*;

public class RBSample {

   static public void main(String[] args) {

      String language;
      String country;

      Locale.setDefault(new Locale("en", "US"));

      List<Locale> localeList = new ArrayList<Locale>();
      localeList.add(Locale.UK);
      localeList.add(Locale.KOREA);

      Locale currentLocale;
      ResourceBundle messages;

      Iterator<Locale> iter = localeList.iterator();
      while (iter.hasNext()){
       currentLocale = iter.next();
System.out.println("\ncurrentLocale = "
                             + currentLocale.getDisplayName());

messages =
ResourceBundle.getBundle("MessagesBundle",currentLocale);

Locale messagesLocale = messages.getLocale();
System.out.println("messagesLocale = "
                             + messagesLocale.getDisplayName());

System.out.println(messages.getString("greetings"));
System.out.println(messages.getString("inquiry"));
System.out.println(messages.getString("farewell"));
      }
   }
}

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
I would expect the following output:
currentLocale = English (United Kingdom)
messagesLocale = English (United States)
Hello.
How are you?
Goodbye.

currentLocale = Korean (South Korea)
messagesLocale = English (United States)
Hello.
How are you?
Goodbye.
ACTUAL -
[The system is using the root MessagesBundle.properties, not the default MessagesBundle_en_US.properties.]
currentLocale = English (United Kingdom)
messagesLocale =
Hiya.
How you doing?
Seeya.

currentLocale = Korean (South Korea)
messagesLocale = English (United States)
Hello.
How are you?
Goodbye.

REPRODUCIBILITY :
This bug can be reproduced always.
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