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https://issues.apache.org/jira/browse/LOG4J2-865?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14156679#comment-14156679
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Ralph Goers commented on LOG4J2-865:
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Log Level filtering on Appenders is independent of filtering on LoggerConfigs
as you might have multiple Appenders configured that you want to filter at
different levels.
Rather than calling ctx.getConfiguration() and modifying the existing
configuration you would be much better off creating a new configuration and
replacing the existing one with the new one once it is constructed.
The AppenderControl actually contains the level to filter on that is specified
in the AppenderRef, not on the Appender itself. If you want to change the level
on the Appender you need to go through the list of appenders held in
AbstractConfiguration, find the one you want, remove the existing filter and
then add a new one. However, this cannot be done atomically so you will be in
a state momentarily where the Appender has no filter.
The Level in the AppenderControl is final, so the only way to change the level
is to remove the Appender from the LoggerConfig and re-add it back using the
new level. Again, this can't be done atomically.
Although what you are asking for may seem simple, it is really quite
complicated and is why we would recommend that you create a new Configuration
with the new levels you want and then replace the old configuration with the
new one. Doing it that way means your configuration will never be in a state
where it is missing items.
> Changing level in LoggerConfig does not change AppenderControl and does not
> allow messages at new log level to be logged
> -------------------------------------------------------------------------------------------------------------------------
>
> Key: LOG4J2-865
> URL: https://issues.apache.org/jira/browse/LOG4J2-865
> Project: Log4j 2
> Issue Type: Bug
> Components: Appenders, Configurators
> Affects Versions: 2.0.2
> Environment: Windows7 64bit, Eclipse, Maven
> Reporter: Andrew Herr
> Fix For: 2.0.2
>
>
> I am wrapping log4j2 in order to replace the logging backend used in house,
> so I am configuring the logger and appenders at runtime with calls to the
> Context, Configuration, and LoggerConfig. I'd like to change the log level on
> the fly, so I get the LoggerConfig for my named logger and call
> setLevel(Level) on it, and then updateLoggers in the context. New messages at
> the new (less severe) level are not logged. Through a debug session, I can
> see that the level in LoggerConfig is correctly updated, but the
> AppenderControl still has the old level, so callAppenders denies my event
> from being logged.
> Code:
> Set up the logger + RollingFileAppender
> name = logName;
> level = logLevel;
> LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
> Configuration config = ctx.getConfiguration();
>
> LoggerConfig loggerConfig = new LoggerConfig(name, level, false);
> PatternLayout layout =
> PatternLayout.createLayout(PatternLayout.SIMPLE_CONVERSION_PATTERN, config,
> null, null, true, false, null, null);
>
> OnStartupTriggeringPolicy startupTrigger =
> OnStartupTriggeringPolicy.createPolicy();
> SizeBasedTriggeringPolicy sizeTrigger =
> SizeBasedTriggeringPolicy.createPolicy("25MB");
> TriggeringPolicy triggerPolicy =
> CompositeTriggeringPolicy.createPolicy(startupTrigger, sizeTrigger);
> DefaultRolloverStrategy rolloverStrategy =
> DefaultRolloverStrategy.createStrategy("5", "1", "min", null, config);
> RollingFileAppender rollingFileAppender =
> RollingFileAppender.createAppender(name + ".log", name + ".log.%i", "true",
> "RollingFile",
> "true", "8192", "true", triggerPolicy, rolloverStrategy,
> layout, null, "true", "false", null, config);
> rollingFileAppender.start();
> loggerConfig.addAppender(rollingFileAppender, level, null);
> config.addLogger(name, loggerConfig);
> ctx.updateLoggers();
> update the level:
> LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
> Configuration config = ctx.getConfiguration();
> LoggerConfig loggerConfig = config.getLoggerConfig(name);
> loggerConfig.setLevel(logLevel);
> ctx.updateLoggers();
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