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diff content/Java/log4j-logger-additivity.md @ 98:1d9382b0329b
Specify the syntax on markdown blocks to avoid broken output that has class=err
| author | Dirk Olmes <dirk@xanthippe.ping.de> |
|---|---|
| date | Thu, 19 Dec 2019 10:04:33 +0100 |
| parents | 4cd9b65e10e4 |
| children |
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--- a/content/Java/log4j-logger-additivity.md Thu Dec 19 09:31:57 2019 +0100 +++ b/content/Java/log4j-logger-additivity.md Thu Dec 19 10:04:33 2019 +0100 @@ -5,6 +5,7 @@ Sometimes you want to write more than one logfile using logj4. This is possible by defining multiple appenders and specifying an appender for a certain logger like this: + :::shell log4j.appender.A1=org.apache.log4j.ConsoleAppender .... log4j.appender.A2=org.apache.log4j.FileAppender @@ -15,4 +16,5 @@ Unfortunately, all output that goes through the logger foo comes out in both appenders, which may not be what you want. The log4j docs talk about *logger additivity* but don't show concrete examples how to configure it. The trick is to configure the additivity **on the logger** and **not on the appender**. (I always fall into that trap). Simply add the following to the example above to stop messages to logger foo come out on A1: + :::shell log4j.additivity.foo = false