删除旧的log4j文件而不使用onstartupriggeringpolicy

Question

我真的想知道为什么log4j2无法在不使用onstartuptriggeringpolicy的情况下删除旧的日志文件。

这一个log4j配置有效：

<RollingFile name="CONFIGLOG" append="true" fileName="../log/config.log"
        filePattern="../log/config-%d{yyyy-MM-dd}.log">
        <PatternLayout pattern="%d %-5p %c{3} [%t]: %m%n" />
        <Policies>
            <OnStartupTriggeringPolicy/>
            <TimeBasedTriggeringPolicy />
            <SizeBasedTriggeringPolicy size="100 MB" />
        </Policies>
        <DefaultRolloverStrategy>
            <Delete basePath="../log" maxDepth="1">
                <IfFileName glob="config-*.log">
                    <IfLastModified age="30d"/>
                </IfFileName>
            </Delete>
        </DefaultRolloverStrategy> 
    </RollingFile>

但是，当我尝试没有onstartuptriggeringpolicy，它不起作用。这是一个无效的。

<RollingFile name="CONFIGLOG" append="true" fileName="../log/config.log"
        filePattern="../log/config-%d{yyyy-MM-dd}.log">
        <PatternLayout pattern="%d %-5p %c{3} [%t]: %m%n" />
        <Policies>
            <TimeBasedTriggeringPolicy />
            <SizeBasedTriggeringPolicy size="100 MB" />
        </Policies>
        <DefaultRolloverStrategy>
            <Delete basePath="../log" maxDepth="1">
                <IfFileName glob="config-*.log">
                    <IfLastModified age="30d"/>
                </IfFileName>
            </Delete>
        </DefaultRolloverStrategy> 
    </RollingFile>