jlink and jdk.localedata
Alan.Bateman at oracle.com
Wed Aug 24 06:13:49 UTC 2016
On 23/08/2016 20:49, Sander Mak wrote:
> I can see how this happens: jdk.localedata is not automatically resolved because it is based on services, and there's a silent fallback to en_US if the nl_NL locale is not found. All perfectly explainable from a module-system technical point of view, but I think this will lead to lots of confused looks in applications relying on locales other than English locales. Not sure what to propose here, other than that this should be very well documented IMO. Maybe jlink could at least warn if the user's system locale is not among the default ones from java.base and suggest to add jdk.localedata to preserve local behavior. Granted, the image is probably targeted to other environments, but at least it's something.
A few things to mention on this:
1. It's an open issue in JEP 282  as to whether jlink should support
2. The only required installed Locale is en_US, specified in
java.util.Locale. I think at one point that the JRE download on Windows
used to have a variant that didn't include all the locales in order to
reduce the download size. You'll see similar issues with the extended
charsets where java.base has the all the specified standard charsets,
other extended charsets are in the jdk.charsets service provider module.
3. I don't know if you've found it yet but there is a jlink plugin for
customizing the locales that are included in the run time image. In this
case, you could use `--add-modules jdk.localedata --include-locales nl`
(the value to --include-locales is the BCP 47 language tag). The main
motive for this plugin is embedded builds where footprint is important
and where you have some idea as to the countries or regions where the
device will be used.
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