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From "Oliver Heger (JIRA)" <>
Subject [jira] Created: (LANG-511) Initialization of available locales in LocaleUtils can be deferred
Date Fri, 03 Jul 2009 09:45:47 GMT
Initialization of available locales in LocaleUtils can be deferred

                 Key: LANG-511
             Project: Commons Lang
          Issue Type: Improvement
    Affects Versions: 2.4
            Reporter: Oliver Heger
            Priority: Minor

{{LocaleUtils}} has a static initializer block that initializes the list of locales available
in the system. This is done by calling {{Locale.getAvailableLocales()}}.

As I had to learn, {{getAvailableLocales()}} can be very expensive, depending on the environment
in which it is called. Obviously, all jars in the class path are scanned to determine the
supported locales. In our project we have a large number of jars on the class path, and the
invocation of the method takes between 10 and 20 seconds. There is an entry in the Java Bug
Database related to this issue:

{{LocaleUtils}} contains some methods that do not need the list of available locales (and
in fact it is one of those methods we would like to use). So I wonder whether the initialization
of the list of available locales could be done on demand. It would then have to be synchronized,
but the advantage is that the expensive initialization is only performed if it is actually

(LANG-488 is also related to this topic.)

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