Issue Type: Bug Bug
Assignee: Logback dev list
Created: 14/Oct/12 11:55 AM
Description:    use DailyRollingFileAppender , propertys set as underside :
log4j.appender.R=org.apache.log4j.RollingFileAppender
log4j.appender.dailyFile.bufferSize=2048
log4j.appender.dailyFile.immediateFlush=false
log4j.appender.dailyFile.bufferedIO=true

when JVM Process finish, there is some data in io buffer not flush to disk.
FileAppender RollingFileAppender maybe have same problem.

 public DailyRollingFileAppender() {
// set when JVM Process finish , flush buffer to disk
          // in my project to extend DailyRollingFileAppender,use this method. maybe your can reference
Runtime.getRuntime().addShutdownHook( ...... );
  }
Environment: sun jdk1.6
Project: logback
Priority: Major Major
Reporter: zhang.haidi
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