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https://issues.apache.org/jira/browse/LANG-720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13067496#comment-13067496
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Henri Yandell commented on LANG-720:
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Note that we'll release this in 3.0.1. 3.0 will go out with this as a known
issue and 3.0.1 will follow (August).
> StringEscapeUtils.escapeXml(input) outputs wrong results when an input
> contains characters in Supplementary Planes.
> -------------------------------------------------------------------------------------------------------------------
>
> Key: LANG-720
> URL: https://issues.apache.org/jira/browse/LANG-720
> Project: Commons Lang
> Issue Type: Bug
> Components: lang.*, lang.text.translate.*
> Affects Versions: 3.0
> Reporter: Taro Yabuki
> Labels: patch
> Fix For: 3.0.1
>
> Attachments: CharSequenceTranslator.java.20110714.diff
>
>
> Hello.
> I use StringEscapeUtils.escapeXml(input) to escape special characters for XML.
> This method outputs wrong results when input contains characters in
> Supplementary Planes.
> String str1 = "\uD842\uDFB7" + "A";
> String str2 = StringEscapeUtils.escapeXml(str1);
> // The value of str2 must be equal to the one of str1,
> // because str1 does not contain characters to be escaped.
> // However, str2 is diffrent from str1.
> System.out.println(URLEncoder.encode(str1, "UTF-16BE")); //%D8%42%DF%B7A
> System.out.println(URLEncoder.encode(str2, "UTF-16BE")); //%D8%42%DF%B7%FF%FD
> The cause of this problem is that the loop to translate input character by
> character is wrong.
> In CharSequenceTranslator.translate(CharSequence input, Writer out),
> loop counter "i" moves from 0 to Character.codePointCount(input, 0,
> input.length()),
> but it should move from 0 to input.length().
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