Reload log4j2 configuration on demand

问题:

I have my log4j2.xml config file set to be checked every 30 seconds:

<Configuration status="WARN" monitorInterval="30">
    ...
</Configuration>

Is it possible to programmatically tell log4j2 to check for changes in the configuration instead of having a timeout?

N.B. I don't want to programmatically load the configuration specifying the config file, I just want to tell log4j2 to check the config file that has been loaded before as if the monitorInterval expired.

Thanks!

回答1:

It looks like I've found the solution:

((org.apache.logging.log4j.core.LoggerContext) LogManager.getContext(false)).reconfigure();

Does anyone see anything wrong/side-effects with this?

回答2:

There is currently no clean way to do this. It can be done with reflection. (Of course this may break if the implementation changes.)

UPDATE: this is wrong. There is a clean way, see jamp's answer below.

org.apache.logging.log4j.core.LoggerContext ctx = (org.apache.logging.log4j.core.LoggerContext) LogManager.getContext(false);

org.apache.logging.log4j.core.config.FileConfigurationMonitor mon = (org.apache.logging.log4j.core.config.FileConfigurationMonitor) ctx.getConfiguration().getConfigurationMonitor();

// use reflection to get monitor's "nextCheck" field.
// set field accessible
// set field value to zero

mon.checkConfiguration();