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https://issues.apache.org/jira/browse/LANG-1148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15295074#comment-15295074
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Pascal Schumacher commented on LANG-1148:
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I agree that non-breakable whitespace should be treated as whitespace. For
example guava
https://github.com/google/guava/blob/8fbeb9038cbe8b382b1ee188ae8459203cd04fb5/guava/src/com/google/common/base/CharMatcher.java#L1217
classifies non-breaking space as whitespace.
Of course there is the compatibility issue, so I guess a change like this
should only be done in commons-lang 4.0.
> StringUtils.isBlank does not work correctly with strings containing
> non-breakable whitespace characters
> -------------------------------------------------------------------------------------------------------
>
> Key: LANG-1148
> URL: https://issues.apache.org/jira/browse/LANG-1148
> Project: Commons Lang
> Issue Type: Bug
> Components: lang.*
> Affects Versions: 2.6
> Environment: Windows 8.1 x64 , Java 1.8, but can be reproduced in any
> environment with an official Oracle JDK or JRE
> Reporter: Aleksandr Bogush
> Priority: Minor
> Labels: test
> Original Estimate: 3h
> Remaining Estimate: 3h
>
> isBlank uses java.lang.Character.isWhitespace(char ch) method, which has not
> been changed for a long time for backward compatibility. Over the years
> non-breakable whitespaces were introduced and are now used in some cases. So
> if we execute the code
> {noformat}org.apache.commons.lang.StringUtils.isBlank("\u00A0"); //returns
> false
> org.apache.commons.lang.StringUtils.isBlank("\u202F"); //returns false
> org.apache.commons.lang.StringUtils.isBlank("\u2007"); //returns
> false{noformat}
> we will get 3 falses, which is not right, according to StringUtils.isBlank
> documentation: {noformat}Checks if a String is whitespace, empty ("") or
> null.{noformat}
> I suggest fixing it by using regex pattern {noformat}"^[\\p{Z}]*$"{noformat}
> instead of looping over the string characters. I know that it is a bit less
> fast than it works now, but it will work much more correctly. I would be glad
> to do it myself and write unit tests for it, so if you want, please contact
> me via email [email protected]
> Additionally, I would modify the documentation itself too, because it does
> not tell that it returns true when meeting multiple whitespaces.
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