RFR: 8298045: Fix hidden but significant trailing whitespace in properties files for core-libs code

[Justin Lu]

On Fri, 2 Dec 2022 16:40:51 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> According to [the specification](https://docs.oracle.com/en/java/javase/19/docs/api/java.base/java/util/Properties.html#load(java.io.Reader)) trailing whitespaces in the values of properties files are (somewhat surprisingly) actually significant.
> 
> We have multiple files in the JDK with trailing whitespaces in the values. For most of this files, this is likely incorrect and due to oversight, but in a few cases it might actually be intended (like "The value is: ").
> 
> After a discussion in the PR for [JDK-8295729](https://bugs.openjdk.org/browse/JDK-8295729), the consensus was to replace valid trailing spaces with the corresponding unicode sequence, `\u0020`. (And of course remove non-wanted trailing spaces.)
> 
> Doing so has a dual benefit:
> 
> 1) It makes it clear to everyone reading the code that there is a trailing space and it is intended
> 
> 2) It will allow us to remove all actual trailing space characters, and turn on the corresponding check in jcheck to keep the properties files, just like all other source code files, free of trailing spaces.
> 
> Ultimately, the call of whether a trailing space is supposed to be there, or is a bug, lies with the respective component teams owning these files. Thus I have split up the set of properties files with trailing spaces in several groups, to match the JDK teams, and open a JBS issue for each of them. This issue is for code I believe belong with the core-libs team.

src/java.sql.rowset/share/classes/com/sun/rowset/RowSetResourceBundle_zh_TW.properties line 160:

> 158: xmlrch.errupdate = \u5EFA\u69CB\u66F4\u65B0\u5217\u6642\u767C\u751F\u932F\u8AA4: {0}
> 159: xmlrch.errupdrow = \u66F4\u65B0\u5217\u6642\u767C\u751F\u932F\u8AA4: {0}
> 160: xmlrch.chars = \u5B57\u5143:\u0020

Likely not needed, since the original and all other l10n versions of RowSetResourceBundle.properties do not have a trailing space for `xmlrch.chars`

src/java.xml/share/classes/com/sun/org/apache/xerces/internal/impl/msg/XMLMessages.properties line 24:

> 22: 
> 23:         BadMessageKey = The error message corresponding to the message key can not be found.
> 24:         FormatFailed = An internal error occurred while formatting the following message:\n\u0020\u0020

Likely a mistake, since as you stated, it is not in the format “foo:\u0020” as there is a newline before the trailing spaces.

However if intentional it should probably be `FormatFailed = An internal error occurred while formatting the following message:\n\u0020`

src/java.xml/share/classes/com/sun/org/apache/xerces/internal/impl/msg/XMLMessages.properties line 139:

> 137:         EncodingByteOrderUnsupported = Given byte order for encoding \"{0}\" is not supported.
> 138:         InvalidByte = Invalid byte {0} of {1}-byte UTF-8 sequence.
> 139:         ExpectedByte = Expected byte {0} of {1}-byte UTF-8 sequence.\u0020\u0020

Same here as well, either a mistake or should be ` ExpectedByte = Expected byte {0} of {1}-byte UTF-8 sequence.\u0020`

src/java.xml/share/classes/com/sun/org/apache/xerces/internal/impl/msg/XMLMessages.properties line 219:

> 217:         MSG_NOTATION_NAME_REQUIRED_FOR_UNPARSED_ENTITYDECL = The notation name is required after \"NDATA\" in the declaration for the entity \"{0}\".
> 218:         EntityDeclUnterminated = The declaration for the entity \"{0}\" must end with ''>''.
> 219: 	MSG_DUPLICATE_ENTITY_DEFINITION = Entity \"{0}\" is declared more than once.\u0020\u0020\u0020\u0020\u0020\u0020\u0020\u0020

Likely not intentional, but if it is then perhaps `MSG_DUPLICATE_ENTITY_DEFINITION = Entity "{0}" is declared more than once.\u0009` instead.

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PR: https://git.openjdk.org/jdk/pull/11489