[ http://jira.qos.ch/browse/LBCORE-61?page=com.atlassian.jira.plugin.system.is... ] Ceki Gulcu commented on LBCORE-61: ---------------------------------- Thank you for the precise analysis of the modularity problem in TimeBasedRollingPolicy due to the fact that it is both a TriggeringPolicy and a RollingPolicy. While I agree that there is a modularity issue, in particular respect to the elapsedPeriodFileName field, I don't see why anyone would reasonably want to combine a date based rolling policy with a size based triggering policy. You would get similar sized files each named by date. What is the use for that? While I would like to favorably respond to your request, the use-case (i.e. time based rolling policy with a size based triggering policy) just does not make sense to me.
TimeBasedRollingPolicy can not be used with any other triggering policies -------------------------------------------------------------------------
Key: LBCORE-61 URL: http://jira.qos.ch/browse/LBCORE-61 Project: logback-core Issue Type: Bug Reporter: Szel Zoltan Assignee: Ceki Gulcu Priority: Critical
If someone would like to have a time based rolling policy with a size based triggering policy, than the user will get a NullPointerException,: at ch.qos.logback.core.rolling.helper.Compress.GZCompress(Compress.java:130) at ch.qos.logback.core.rolling.TimeBasedRollingPolicy.rollover(TimeBasedRollingPolicy.java:142) at ch.qos.logback.core.rolling.RollingFileAppender.rollover(RollingFileAppender.java:91) at ch.qos.logback.core.rolling.RollingFileAppender.subAppend(RollingFileAppender.java:116) at ch.qos.logback.core.WriterAppender.append(WriterAppender.java:124) at ch.qos.logback.core.AppenderBase.doAppend(AppenderBase.java:81) at ch.qos.logback.core.spi.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:51) at ch.qos.logback.classic.Logger.appendLoopOnAppenders(Logger.java:282) at ch.qos.logback.classic.Logger.callAppenders(Logger.java:266) at ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:487) at ch.qos.logback.classic.Logger.filterAndLog(Logger.java:479) The cause of this issue is the isTriggeringEvent method in the TimeBasedRollingPolicy which has a side effect, namely it prepares the file name of the file which is about to rotate. If someone uses a triggering policy other than the same TimeBasedRollingPolicy, than the isTriggeringEvent method will not be called, hence the elapsedPeriodFileName will be null, hence a null pointer exception will be thrown in the start of the compression or while renaming. Please modify the isTriggeringEvent to not have this side effect + the rollover logic to capture the time information from the current event. Thanks, Zoltan
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