outputting header twice for RollingFileAppender

["bong@ucdavis.edu" <bo...@ucdavis.edu>]

Hi.  I have a RollingFileAppender where I’ve created a custom layout.  And,
in the custom layout, all I’m doing is adding a header row to my log file
(see below).

public class NoMatchingTranscriptPatternLayout extends PatternLayout {

      public NoMatchingTranscriptPatternLayout() {
            super();
      }
      
      public String getHeader() {
            return (new String("Date of Download\tPdf\n"));
      }
}

Now, I have a job that’s scheduled to run on a daily basis so the log files
get updated daily.  However, when the log file gets updated, the header gets
outputted to the log file each time the job is run.  I have log4j version
1.2.15.  Is this a bug?  Shouldn’t the header only get generated if the file
is new?  Please advise.  

Thanks

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