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From "Georg Friedrich (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LOG4J2-1653) CronTriggeringPolicy uses wrong naming and produces NPE
Date Thu, 05 Jan 2017 15:58:58 GMT

    [ https://issues.apache.org/jira/browse/LOG4J2-1653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15801716#comment-15801716
] 

Georg Friedrich commented on LOG4J2-1653:
-----------------------------------------

I see.

I will give you an update on Monday whether the new code is working for me or not.

> CronTriggeringPolicy uses wrong naming and produces NPE
> -------------------------------------------------------
>
>                 Key: LOG4J2-1653
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-1653
>             Project: Log4j 2
>          Issue Type: Bug
>    Affects Versions: 2.7
>            Reporter: Georg Friedrich
>            Assignee: Ralph Goers
>            Priority: Critical
>             Fix For: 2.8
>
>         Attachments: ConfigurationScheduler.patch, CronTriggeringPolicy.patch
>
>
> After having worked on LOG4J2-1649 I found another serious issue in combination with
the CronTriggeringPolicy.
> The policy has some very weird behaviour when it comes to naming rolled over files and
also creates a NPE on specific configurations.
> The following is broken:
> * when using "evaluateOnStartup" a NPE is the result of an immediate rollover
> * when no rollover is happing at startup the first rollover produces a file that uses
the time of the rollover (e.g. rollover is happening at midnight 2010-05-05 producing a rolled
over file named log-2010-05-05)
> * but it becomes worse: all files after the first rollover are named using a date of
the "previous rollover date minus a second" - when using the previous example this results
in:
> ** first rollover happening at midnight 2010-05-05, resulting in file log-2010-05-05
> ** next rollover happening at 2010-05-06, resulting in file log-2010-05-04
> ** next rollover happening at 2010-05-07, resulting in file log-2010-05-05 again (!)
so the previously saved file gets removed!
> I would expect the file to be named after the content it contains. E.g. a file rolled
over at 2010-05-05 should be named log-2010-05-04 as it contains all the data of the 2010-05-04.
> So I decided to write a patch for those problems too (again the sources of Log4J2 2.7
were used). Unfortunately I needed a method to calculate the last cron date. The CronExpression
class has such a method ("getTimeBefore") but nobody implemented this one since years.
> The only quick solution I found: I used another 3rd party library to fix this called
cronutils. The solution I wrote uses the latest version of this library which now only supports
Java 8.
> My guess is that you don't want Log4J2 to only support Java 8 - if this is the case you
will have to use a different library/version or whatever to be able to calculate the last
cron date.
> This patch should also fix the following bugs: LOG4J2-1640, LOG4J2-1621, LOG4J2-1487,
LOG4J2-1474 (and maybe even more - I didn't feel like searching the whole Jira ;-) )



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