Nikolai created LOG4J2-1232:
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             Summary: Incorrect log rotation in last week of year
                 Key: LOG4J2-1232
                 URL: https://issues.apache.org/jira/browse/LOG4J2-1232
             Project: Log4j 2
          Issue Type: Bug
    Affects Versions: 2.5, 2.3
            Reporter: Nikolai
            Priority: Critical


I have log4j2.xml configuration with several log-files definitions like:

    <RollingRandomAccessFile name="FIX_MESSAGES_FILE_MARKET_DATA" 
fileName="logs/market_data_msg.log"
                             
filePattern="logs/market_data_msg.log-%d{yyyy-MM-'W'W}" immediateFlush="false">
      <PatternLayout pattern="%m%n"/>
      <Policies>
        <TimeBasedTriggeringPolicy/>
      </Policies>
    </RollingRandomAccessFile>

Today (2015-12-28) all log files suddenly become almost empty. Reason in 
permanent rotation current log file in file "market_data_msg.log-2014-12-W5" 
(wrong year). As result of permanent rotation both files contains only 0 or 1 
line and information is lost!

Obviously, the problem related with the fact that today started last week of 
the month.



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