DO NOT REPLY [Bug 34874] New: - XMLLayout and HTMLLayout do not detect use of incompatible encoding

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http://issues.apache.org/bugzilla/show_bug.cgi?id=34874

           Summary: XMLLayout and HTMLLayout do not detect use of
                    incompatible encoding
           Product: Log4j
           Version: 1.3alpha
          Platform: Other
        OS/Version: other
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Layout
        AssignedTo: log4j-dev@logging.apache.org
        ReportedBy: carnold@apache.org


XMLLayout and HTMLLayout assume that the encoding of any associated writer is either UTF-8 or 
UTF-16.  If an encoding is not explicitly specified in the appender, the default platform encoding will be 
used which is highly unlikely to be UTF-8 or UTF-16 on Windows.  A mismatch in encoding will result in 
non-wellformed XML documents if a non-US-ASCII character is emitted in the log.

The proposed resolution is to add a new interface

interface EncodingSensitiveLayout {
    /*  @return encoding selected by layout  */ 
    String setEncoding(final String proposedEncoding);
}

to be implemented by XMLLayout and HTMLLayout.  In  the WriterAppender.activateOptions, if the 
layout supported EncodingSensitiveLayout, it would be passed the proposed encoding and would have a 
chance to either modify its behavior to be consistent with that encoding or to override the choice of 
encoding.

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