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https://issues.apache.org/jira/browse/IO-557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16285741#comment-16285741
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Sebb commented on IO-557:
-------------------------
I agree that code should never use toUpperCase() or toLowerCase().
It should always pass the Locale, which should generally be Locale.ROOT.
If the code needs to use the default Locale then it should provide it as a
parameter.
[The same applies to String.getBytes() etc.]
> UnsupportedEncodingException when opening an ISO-8859-1 XML stream with
> Turkish as the default locale
> -----------------------------------------------------------------------------------------------------
>
> Key: IO-557
> URL: https://issues.apache.org/jira/browse/IO-557
> Project: Commons IO
> Issue Type: Bug
> Components: Streams/Writers
> Affects Versions: 2.6
> Environment: JVM running with argument -Duser.language=tr, or on an
> Operating System with Turkish as its preferred language.
> Reporter: luccioman
> Priority: Minor
> Labels: easyfix
>
> When the default locale is set to the Turkish language, using the
> XmlStreamReader constructor on an XML stream with a prolog including the
> ISO-8859-1 charset name in lowercase as its encoding throws a
> UnsupportedEncodingException (java.io.UnsupportedEncodingException:
> İSO-8859-1).
> Example XML prolog : <?xml version="1.0" encoding="iso-8859-1"?>
> This is apparently because the XmlStreamReader class uses
> String.toUpperCase() in its getXmlProlog() function. It should rather use
> toUpperCase(Locale.ROOT) or toUpperCase(Locale.US) as already done in the
> getContentTypeEncoding() function. Otherwise the behaviour can be different
> depending on the default locale, as the dotted lower case i becomes a dotted
> upper case i in the Turkish language, which not the case with other languages.
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