Volker,

It looks like Configurator.setLevel(String loggerName, Level level) will do the 
same thing as the code below.

Ralph

> On Feb 9, 2018, at 1:21 AM, Volker Weber <v.we...@inexso.de> wrote:
> 
> Hi Mike,
> 
> in our app we implemented a REST-Service to reconfigure log4j2 at runtime. 
> 
> It's mainly to apply changes to the configuration and call updateLoggers()
> 
>     LoggerContext loggerContext = (LoggerContext) 
> LogManager.getContext(false);
>     Configuration configuration = loggerContext.getConfiguration();
>     LoggerConfig loggerConfig = configuration.getLoggerConfig(loggerName);
>     LoggerConfig specificConfig = loggerConfig;
> 
>     if (!loggerConfig.getName().equals(loggerName)) {
>       specificConfig = new LoggerConfig(loggerName, level, true);
>       specificConfig.setParent(loggerConfig);
>       configuration.addLogger(loggerName, specificConfig);
>     }
>     specificConfig.setLevel(level);
>     loggerContext.updateLoggers();
> 
> see attachment for our full Log4j2Util code.
> 
> Regards,
>   Volker
> 
> 
> 
> 2018-02-08 21:28 GMT+01:00 Mike Kienenberger <mkien...@gmail.com 
> <mailto:mkien...@gmail.com>>:
> As others have reported in years past, the examples in the docs for
> 
> Programmatically Modifying the Current Configuration after Initialization
> 
> are out of date.  They don't compile.  They don't work (affect the
> existing logging) even if you do fix the errors.
> 
> Here's my situation:
> 
> I am working in an environment with EVIL.JAR which includes a log4j2.xml file.
> I can't change the jar.  I can't specific a System Property to override it.
> 
> My code gets called as a loaded module long after the logging system
> is initialized.
> 
> I want logging in my own code to go to a different location, and
> preferably I'd like to read the configuration in from a log4j2.xml
> file so that anyone who uses my module isn't victim to the same evil
> hardcoded-logging practices of EVIL.JAR.
> 
> Creating an XMLConfiguration and initializing it lets me read the xml
> file easily enough.   Looping through the data gets me the Appenders,
> Filters and Loggers.   But I still can't use them to modify the
> existing configuration.
> 
> Another person took the approach of using JUL instead.  I hate JUL and
> I'd really rather not have to go down that route.
> 
> Thanks in advance.
> -Mike
> 
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