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https://issues.apache.org/jira/browse/LOG4J2-1794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17677167#comment-17677167
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Ralph Goers commented on LOG4J2-1794:
-------------------------------------
Configurator.initialize() will essentially be a noop in this case. Simply
replace it with.
{code:java}
Configurator.reconfigure(builder.build())
{code}
I will be updating the Javadoc to indicate that the initialize calls that
accept a Configuration will be ignored if the LoggerContext has already been
configured.
> Programmatic reconfiguration doesn't affect existing loggers
> ------------------------------------------------------------
>
> Key: LOG4J2-1794
> URL: https://issues.apache.org/jira/browse/LOG4J2-1794
> Project: Log4j 2
> Issue Type: Bug
> Components: Configurators
> Affects Versions: 2.7
> Reporter: Simon Cooper
> Assignee: Ralph Goers
> Priority: Major
>
> Sample code:
> {code} private static final Logger Log = LogManager.getLogger();
> public static void main(String[] args) throws Throwable {
> ConfigurationBuilder<BuiltConfiguration> builder =
> ConfigurationBuilderFactory.newConfigurationBuilder();
> builder.setConfigurationName("Test");
> AppenderComponentBuilder console = builder.newAppender("Stdout",
> "Console")
>
> .add(builder.newLayout("PatternLayout").addAttribute("pattern", "Format:
> %m%n"));
> builder.add(console);
>
> builder.add(builder.newRootLogger(Level.INFO).add(builder.newAppenderRef("Stdout")));
> Configurator.initialize(builder.build());
> Configurator.setRootLevel(Level.INFO);
> LogManager.getLogger().info("Log!");
> }{code}
> The log statement at the bottom doesn't use the specified format, it uses the
> existing format. If the {{private static final Log = ...}} statement at the
> top is commented out, the log *does* use the reconfigured format.
> Reconfiguring the log settings should affect any loggers already created.
> Waiting until the logging is configured before creating any loggers is not
> always feasible - for example, if your entrypoint class has a static
> {{Logger}} and the reconfiguration is being done by a library you're calling
> into.
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