Initialization of available locales in LocaleUtils can be deferred
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Key: LANG-511
URL: https://issues.apache.org/jira/browse/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:
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4908648
{{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 required.
(LANG-488 is also related to this topic.)
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