Time based triggering policy in log4j2

Question

I am trying to create new log files on an hourly basis. I am using TimeBasedTriggerringPolicy of lo4j2 in RollingFileAppender. Below is the sample xml configuration code i have taken from log4j2 official site.

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="warn" name="MyApp" packages="">
    <Appenders>
        <RollingFile name        ="RollingFile"
                     fileName    ="logs/app.log"
                     filePattern ="logs/$${date:yyyy-MM}/app-%d{yyyy-MM-dd-HH}-%i.log.gz">
            <PatternLayout>
                <Pattern>%d %p %c{1.} [%t] %m%n</Pattern>
            </PatternLayout>
            <Policies>

            <!-- *** -->
            <TimeBasedTriggeringPolicy interval="1"
                                       modulate="true"/>
            <!-- *** -->
            
            <SizeBasedTriggeringPolicy size="250 MB"/>
            </Policies>
        </RollingFile>
    </Appenders>
    <Loggers>
        <Root level="error">
            <AppenderRef ref="RollingFile"/>
        </Root>
    </Loggers>
</Configuration>

In the interval attribute I have set 1 which signifies 1 hour. But still my file does not roll every 1 hour.

Please help me find any mistake.

Note : I have included beta9 of log4j2 (which is the latest)

Answer 1

1 here indicates 1 day and not 1 hour. I have manually tested with below configuration.

<RollingFile name="T" fileName="/data_test/log/abc.log"
        filePattern="/data_test/log/abc-%d{MM-dd-yyyy}-%i.log">
        <PatternLayout>
            <Pattern>%d{ISO8601} %-5p [%t] (%F:%L) - %m%n</Pattern>
        </PatternLayout>
        <Policies>              
            <TimeBasedTriggeringPolicy interval="1" modulate="true"/>
            <SizeBasedTriggeringPolicy size="100 KB" />
        </Policies>
    </RollingFile>

For manual testing, I change the system date and time. First, try with increasing 1 hour. The log files will be generated but not as per the expectation. Then change the system date, increase by 1 day and then see the results.

Suppose the last log file (abc.log) on day 29-Oct is of 50 KB. Configuration size is 100 KB. If we change the day (increase by 1 day) and then run. Then, last file will be renamed 29-Oct-(some sequence number).log (50 KB file as it is copied) and new file will be created with abc.log

I have tried this with simple servlet with below configuration in web.xml

<context-param>
    <param-name>log4jConfiguration</param-name>
    <param-value>log4j2.xml</param-value>
</context-param>

keep log4j2.xml in src folder. log4j2.xml is not loaded if we keep it in classpath.