[LOG4J2-3349] RollingFileAppenderBuilder in log4j1 bridge does not create the appender as in log4j1

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.17.1
• Fix Version/s: 2.17.2
• Component/s: Configuration

Language

Java

• Assignee: Unassigned
• Reporter: Achim
• Created: 19/Jan/22 09:30
• Updated: 26/Jan/22 10:05
• Resolved: 26/Jan/22 10:05

Description

https://github.com/apache/logging-log4j2/blob/release-2.x/log4j-1.2-api/src/main/java/org/apache/log4j/builders/appender/RollingFileAppenderBuilder.java

creates the appender with a date filePattern.

We are using a configuration like this

log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{DEFAULT} [%t] %-5p %-33c{1} %x %m%n
log4j.appender.file.File=foobar.log
log4j.appender.file.MaxFileSize=200000KB
log4j.appender.file.MaxBackupIndex=100

With log4j 1.2.17 this created rolled files
foobar.log.1
foobar.log.2
etc

With log4j2 and the bridge we get
foobar.log2021-12-19

We could live with the date pattern but it should produce
foobar.log.2021-12-19

But since the rollover policy is still size-based what happens if the file is rolled twice a day?