[logback-dev] [Bug 92] New: TimeBasedRollingPolicy will not rollover a log file, append logs to a old log file.

bugzilla-daemon at pixie.qos.ch bugzilla-daemon at pixie.qos.ch
Wed Aug 22 23:30:40 CEST 2007


           Summary: TimeBasedRollingPolicy will not rollover a log file,
                    append logs to a old log file.
           Product: logback-core
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: critical
          Priority: P1
         Component: Rolling
        AssignedTo: logback-dev at qos.ch
        ReportedBy: benbrand at mac.com

If you use TimeBasedRollingPolicy to rollover a log file and no log wasn't
wrote into the log beyond the timing of rollover,  and if you restart your
application, the log file doesn't roll, then new log will be appended into old
log file.

1. in logback.xml, set your FileNamePattern like
2. Simply do a kind of thing, which will make some logs into your log file.
3. Wait for some minutes.
4. restart your application.
5. do a kind of thing, which will make some logs into your log file.

the FileNamePattern is 'log.%d{yyyy-MM-dd_HH-mm}.log', so the log file will be
roll every minutes. On case 5 of above example, the log file should be roll
over, because some minutes already have passed after last logs wrote into the
log file. But the file didn't be roll overed.


In start() method of TimeBasedRollingPolicy, you initialize a variable
'lastCheck' to System.currentTimeStamp().  So if you restart your application,
the last check time will be set to just NOW.

you should initialize the variable to a last modified time of a current log

See below source code. from '//modified by Tsutomu YANO' to '//until here'.


public void start() {
        // set the LR for our utility object

        // find out period from the filename pattern
        if (fileNamePatternStr != null) {
                fileNamePattern = new FileNamePattern(fileNamePatternStr,
        } else {
                throw new IllegalStateException(FNP_NOT_SET + SEE_FNP_NOT_SET);

        DateTokenConverter dtc = fileNamePattern.getDateTokenConverter();

        if (dtc == null) {
                throw new IllegalStateException("FileNamePattern [" +
fileNamePattern.getPattern() + "] does not contain a valid DateToken");

        int len = fileNamePatternStr.length();
        switch (compressionMode) {
        case Compress.GZ:
                activeFileNamePattern = new
FileNamePattern(fileNamePatternStr.substring(0, len - 3), this.context);

        case Compress.ZIP:
                activeFileNamePattern = new
FileNamePattern(fileNamePatternStr.substring(0, len - 4), this.context);
        case Compress.NONE:
                activeFileNamePattern = fileNamePattern;
        addInfo("Will use the pattern " + activeFileNamePattern + " for the
active file");

        rc = new RollingCalendar();
        addInfo("The date pattern is '" + dtc.getDatePattern() + "' from file
name pattern '" + fileNamePattern.getPattern() + "'.");

        //modified by Tsutomu YANO
        //if a current log file exists, initialize a 'lastCheck' variable to
        //last modified date of the file.
        File currentFile = new File(getParentFileName());
        if(currentFile.exists() && currentFile.canRead()) {
        } else {
                // currentTime = System.currentTimeMillis();
        //until here

        nextCheck = rc.getNextCheckMillis(lastCheck);

        // Date nc = new Date();
        // nc.setTime(nextCheck);

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