CorayThan CorayThan - 1 year ago 148
Java Question

Programmatically change log level in Log4j2

I'm interested in programmatically changing the log level in Log4j2. I tried looking at their configuration documentation but that didn't seem to have anything. I also tried looking in the package:

, but nothing in there looked helpful either.

Answer Source

EDITED to reflect changes in the API introduced in Log4j2 version 2.0.2

If you wish to change the root logger level, do something like this :

LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
Configuration config = ctx.getConfiguration();
LoggerConfig loggerConfig = config.getLoggerConfig(LogManager.ROOT_LOGGER_NAME); 
ctx.updateLoggers();  // This causes all Loggers to refetch information from their LoggerConfig.

Here is the javadoc for LoggerConfig.

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