How to reconfigure log4j2 at runtime with new xml file

Question

I'm using log4j2 in a Web Application (servlet 3.0 API)

Log4j2 is configuring itself automatically when the application is started using a log4j2.xml file inside the WEB-INF directory.

When the context is started I execute some logic that produce some logs, and all the log produced are working accordingly to the rules defined in the log4j2.xml file.

At the end of my initialization logic I call a service that gives to me one or more log4j2 xml configuration files (for example, config1.xml, config2.xml and config3.xml).

Now I want to 'reconfigure' log4j using my initial log4j2.xml file together with all the new configuration files.

I cannot find a way to do this; I can find only a way to add programmatically new Appenders, new Loggers and so on;

I'd like to tell log4j2 "hey, here are some new configuration files; please, parse them and update your configuration accordingly"

There is a way to do this?

thanks

Please check if "Composite Configuration" as described in the manual link works. — vionixt
– vionixt, Commented Nov 21, 2019 at 12:11
Unfortunately, that dosn't work. This is because the Composite Configuration can be used to specify more than one configuration file - and that's ok, but I need something more: I need to configure Log4j2 a second time, after the initial configuration happened... and I cannot find any API to do this — user1561017
– user1561017, Commented Nov 21, 2019 at 13:08
Chcek if the following helps. code ((org.apache.logging.log4j.core.LoggerContext) LogManager.getContext(false)).reconfigure(); — vionixt
– vionixt, Commented Nov 22, 2019 at 8:34
Great!! It works. I've changed a bit the code to avoid the cast, using directly the org.apache.logging.log4j.core.LoggingContext API. I will responde to my question, pointing to your comments! ty — user1561017
– user1561017, Commented Nov 22, 2019 at 11:24

user1561017 · Accepted Answer · 2019-11-22 11:28:45Z

3

Thanks to Vionixt comment to my question, I solved the problem.

The code I used was:

System.setProperty("log4j.configurationFile", "<configFile1>,<configFile2>,<configFile3>");
LoggerContext.getContext(false).reconfigure();

where LoggerContext is

org.apache.logging.log4j.core.LoggingContext

After reconfiguration, all the new Logging rules were available and also used!

thank you so much, cheers

answered Nov 22, 2019 at 11:28

user1561017

4036 silver badges16 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Jaraws Over a year ago

How did you reload your new configurations?

Collectives™ on Stack Overflow

How to reconfigure log4j2 at runtime with new xml file

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related