Using FileNamePattern, RollingFileAppender in log4j

Question

I have a log file named app.log. When it rolls over (I'm setting it to every minute just for testing purposes), I would like it to be renamed to app-YYYY-MM-dd_HH-mm.log but it's not working. Below is my log4j settings:

log4j.appender.myLog=org.apache.log4j.RollingFileAppender
log4j.appender.myLog.rollingPolicy=TimeBasedRollingPolicy
log4j.appender.myLog.File=logs/app.log
log4j.appender.myLog.rollingPolicy.FileNamePattern=logs/app-%d{yyyy-MM-dd_HH-mm}.log
log4j.appender.myLog.Append=true
log4j.appender.myLog.layout=org.apache.log4j.PatternLayout
log4j.appender.myLog.layout.ConversionPattern=%d %-5p [%t] %-17c{2} (%13F:%L) %3x - %m%n

Does anyone know what's the problem? During the rollover, it just renames the file into app.log.1.

Answer 1

According to the log4j wiki:

Note that TimeBasedRollingPolicy can only be configured with xml, not log4j.properties

The API doesn't mention that, but perhaps that's the problem?