How to get log4j to roll files based on date and size

log4j

So log4j comes with two existing log rollers: RollingFileAppender, and DailyRollingFileAppender. Has anyone heard of an appender that does both of what the former do?

I need an appender that will roll log files based on filesize, but also append the current date to it.

I've been thinking about creating my own appender, but if there is already one that has been created, why not save the time and use that one?

Best Answer

Looks like you want a mix of the http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/DailyRollingFileAppender.html and the http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/RollingFileAppender.html.

You'll have to code by yourself. The good news is: you'll just have "merge" those classes functionality, no "low level" new code required.

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Java – Filename with date in Log4j

I think you could just set a system property in code to contain the current date:

static{
    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
    System.setProperty("current.date", dateFormat.format(new Date()));
}

Then in your log4j.xml file you can use the system property when specifying the log file name in the appender:

<appender name="MYAPPENDER" class="org.apache.log4j.FileAppender">
    <param name="File" value="${user.home}/myApp-${current.date}.log" />

ETA: Now that I think about it you may have to setup the system property using a static initializer to make sure the property is set before log4j is configured.

Log4j: Rolling logs into .gz file with DailyRollingFileAppender using TimeBasedRollingPolicy

Pardon my surprise, but at the exact link you gave above it says in the accepted answer:

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

Have you tried rewriting your configuration to XML format?

Best Answer

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Java – Filename with date in Log4j

Log4j: Rolling logs into .gz file with DailyRollingFileAppender using TimeBasedRollingPolicy

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