Configure log4j log level using an external configuration file

Question

Is it possible to configure the log4j log level using an external configuration file? Rather than have a user configure the log level in the log4j.properties file, I would like them to configure the log level using a project configuration file.

WulfgarPro

Do you plan to re-deploy your app after the log4j settings have been updated by the user? Otherwise log4j will not pick up those changes. — CoolBeans
– CoolBeans, Commented Mar 28, 2011 at 4:56

somid3 · Accepted Answer · 2011-03-28 05:03:34Z

2

That depends on your build/make tool. For example: in Maven I do just that. In Maven there is "filtering" feature that you can enable. Maven filtering will replace ${some_property} in all your resource files with whatever the value of "some_property" is in Maven.

That is how I change my Log4J properties if I am in dev or prod mode. Other than that, I dont know if Log4J itself has such a feature. I am sure the same is possible via Ant.

answered Mar 28, 2011 at 5:03

somid3

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6 Comments

wulfgarpro Over a year ago

@somid3, I can extract the property with Ant .. but how do I insert it into my log4j.properties file?

somid3 Over a year ago

I just goggled this and haven't used it ant filtering. It seems the ant notation is to surround the value with @s. Your Log4J props file would like: property_name = @some_value@ where "some_value" is defined in your build.xml

wulfgarpro Over a year ago

@somid3 - i'm not sure how the Filter task has anything to do with my problem. My current thought process is to remove the log4j.properties file and setup the logging level programmatically via the key-value project configuration file.

somid3 Over a year ago

Filter is good for when you want to pass a global value to a properties file. For example your log4j.properties will have a line "log4j.rootCategory=@level@" and you can define "level" in Ant. Your project configuration will define the value for "level" and Ant will replace @level@ in your log4j.properties file -- I think that is your question, otherwise can you clarify your situation?

wulfgarpro Over a year ago

@somid3 - filter works. Thanks! I added something like so: <filter token="LOG-LEVEL" value=${LOGGING}. The LOGGING variable comes from my properties file and LOG-LEVEL is defined within log4j.properties like so: @LOG-LEVEL@.

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