How do I adjust log4j levels at runtime?

Question

I have a simple web app running on Tomcat 5.5 with log4j for logging. Occasionally I need to push the logging down to DEBUG but most of the time I'm happy with INFO.

I can change my config xml and restart the app but I would prefer to switch the log levels on the fly. Is there a standard technique for this?

consider exposing the logger via JMX?

Paul McKenzie
– Paul McKenzie

2009-07-29 16:00:44 +00:00
Commented Jul 29, 2009 at 16:00 — Paul McKenzie
– Paul McKenzie, Commented Jul 29, 2009 at 16:00

Vinay Sajip · Accepted Answer · 2009-07-29 14:01:07Z

6

Just use the programmatic API:

logger.setLevel(Level.DEBUG)

in your program when you need more verbose logging output, and

logger.setLevel(Level.INFO)

to make it less verbose again.

answered Jul 29, 2009 at 14:01

Vinay Sajip

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1 Comment

Dave Patterson Over a year ago

If you're using weblogic they have a drop-in JSP that allows you to adjust all running loggers using this API.

Mariano Ruiz · Accepted Answer · 2011-11-07 17:07:12Z

I created a new java application module (jar) to do this in a web interface at runtime, and also have a page to view the log result. Configure the jar is very simple: must be placed in the /WEB-INF/lib folder, and add a mapping to the servlet in the /WEB-INF/web.xml file.

Project site: http://www.log4jwebtracker.com

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