David Johle created LOG4J2-116:
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Summary: RollingFileAppender archives have wrong date values
Key: LOG4J2-116
URL: https://issues.apache.org/jira/browse/LOG4J2-116
Project: Log4j 2
Issue Type: Bug
Components: Core
Affects Versions: 2.0-beta2
Reporter: David Johle
Suppose I have an appender configured like so:
<RollingFile name="test"
fileName="logs/test"
filePattern="logs/test.%d{yyyy-MM-dd}">
<PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} %-5level %message%n"/>
<TimeBasedTriggeringPolicy interval="1" modulate="true"/>
</RollingFile>
Supposed today is 2012-11-13, and thus tomorrow is 2012-11-14.
I create several logging events today, and as expected they end up in a file
named "logs/test"
Midnight goes by, and it is now the 14th. Some more logging events occur
around 12:01 am.
What I expect to see after this is:
logs/test
logs/test.2012-11-13
What I actually end up seeing is:
logs/test
logs/test.2012-11-14
So the archived entries of the 13th are in a file name maching the 14th. That
is quite confusing!
I tested this with some other formats, and it seems that no matter what is the
most specific (day, hour, minute, etc.) field, it is always "1 higher" than
expected.
I traced through the code, and the culprit seems to be in PatternProcessor:
protected final void formatFileName(final Object obj, final StringBuilder
buf) {
Object[] objects = new Object[] {new Date(System.currentTimeMillis()),
obj};
formatFileName(objects, buf);
}
So the Date being used for the filename is the current time when the name is
computed, which is guaranteed to be within an interval that is after the one of
the file contents. If I went a copule of intervals (in this case days) without
log events, then it could be stamped with a name that is several days after the
contents.
In the latter case, I'm not sure if I'd expect to see a filename with the 13th
still, or maybe the 15th (assuming rollover happened during the 16th). But in
either case, I definitely don't expect to see a filename with the 16th.
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