MissingResourceException - Can't find bundle for base name

Question

I know that there are a lot of questions and answers exactly about this error on stackoverflow and other forums. But I still can not find the solution...

For speed reasons I have one utility class which loads all static data maps (for example months) depending on locale provided.

So this utility class looks something like this:

public static final String GLOBAL_MESSAGES = "globalMessages";

private static Map<Integer,Month> monthsMap;

private ResourceBundle getResourceBundle(Locale locale) {
    ResourceBundle rb = ResourceBundle.getBundle(GLOBAL_MESSAGES, locale);
    return rb;
}

private Map<Integer,Month> getMonths() {
    if(monthsMap == null) {
        setMonths();
    }
    return monthsMap;
}

private void setMonths() {
    try {
        monthsMap = getFactory().getDAO().getAllMonths();
    } catch (SQLException e) {
        logger.error(e);
    } catch (EmptyResultException e) {
        logger.error(e);
    }
}

public Map<Integer,Month> getMonths(Locale locale) {
    if(locale == null) {
        return monthsMap;
    } else {
        if(this.locale != locale) {
            this.locale = locale;
            setMonths();
        }
    }
    ResourceBundle rb = getResourceBundle(locale);
    Map<Integer,Month> map = new HashMap<Integer, Month>();
    for(Month akVO : getMonths().values()) {
        try {
            akVO.setName(rb.getString(akVO.getName()));
        } catch (MissingResourceException e) {
            //already done
        }
        map.put(akVO.getId(), akVO);
    }       
    return map;
}

Files globalMessages.properties (globalMessages_en_US.properties,...) are directly in source package resources. When deployed on Tomcat there are in folder WEB-INF/classes.

Now the problem. It all works when working in this application. But I have another application which connects throught REST API (JAX-RS) to this one. When making a request App/rest/months.xml I get the following error:

java.util.MissingResourceException: Can't find bundle for base name globalMessages, locale en_us

I am really lost. And desperate...

Answer 1

Ok... Found the error. After one f* day... The problem is in case sensitive letters. Even though, when setting the locale from rest with "en_US" somehow ResourceBundle (when going through REST) is looking for "en_us".

EDIT: Ok, found also the error why it was all in small letters. Problem was, because I was creating locale with:

Locale locale = new Locale("en_US");

instead of:

Locale locale = new Locale("en","US");