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From "Jim Gomes (JIRA)" <jira+amq...@apache.org>
Subject [jira] Created: (AMQNET-230) Xml Message Encoding should not add Byte Order Mark (BOM) into TextMessage field
Date Tue, 09 Feb 2010 01:09:32 GMT
Xml Message Encoding should not add Byte Order Mark (BOM) into TextMessage field
--------------------------------------------------------------------------------

                 Key: AMQNET-230
                 URL: https://issues.apache.org/activemq/browse/AMQNET-230
             Project: ActiveMQ .Net
          Issue Type: Bug
          Components: NMS
    Affects Versions: 1.2.0
            Reporter: Jim Gomes
            Assignee: Jim Gomes
             Fix For: 1.3.0


The XmlSerializer in XmlUtl is adding a Byte Order Mark (BOM) as it is marshaling XML messages.
 The BOM is being added because it is using a MemoryStream as the underlying buffer mechanism.
 Technically, adding a BOM mark to a typed field is incorrect.  The message body of a TextMessage
is typed as a Unicode string, therefore no BOM should be added.  Adding a BOM breaks inter-platform
compatibility with other clients.  The following is taken from the Unicode FAQ (http://unicode.org/faq/utf_bom.html):

{quote}
Q: Why wouldn't I always use a protocol that requires a BOM?

A: Where the data is typed, such as a field in a database, a BOM is unnecessary. In particular,
if a text data stream is marked as UTF-16BE, UTF-16LE, UTF-32BE or UTF-32LE, a BOM is neither
necessary nor permitted. Any FEFF would be interpreted as a ZWNBSP.

Do not tag every string in a database or set of fields with a BOM, since it wastes space and
complicates string concatenation. Moreover, it also means two data fields may have precisely
the same content, but not be binary-equal (where one is prefaced by a BOM).
{quote}



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