[LOG4J2-1818] Fix rollover to work when filePattern contains no directory components

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.8
• Fix Version/s: 2.8.1
• Component/s: Appenders
• Assignee: Gary D. Gregory
• Reporter: Gary D. Gregory
• Created: 16/Feb/17 21:24
• Updated: 18/Feb/17 17:59
• Resolved: 16/Feb/17 21:29

Description

See https://github.com/apache/logging-log4j2/pull/59

Prior to this patch, the following config threw NPE at parent.mkdirs() because parent was null when using e.g.:

        <RollingRandomAccessFile name="FILE"
                                 fileName="foo.log"
                                 filePattern="foo-%d{yyyy-MM-dd}-%i.log.gz"
                                 immediateFlush="false">

while this config did not:

        <RollingRandomAccessFile name="FILE"
                                 fileName="foo.log"
                                 filePattern="./foo-%d{yyyy-MM-dd}-%i.log.gz"
                                 immediateFlush="false">

e.g. by adding ./ in front of the filePattern value.

Issue Links

• is duplicated by: LOG4J2-1815 An exception occurred processing Appender RollingFileMain java.lang.NullPointerException