Mercurial > hg > Blog

annotate content/Java/log4j-based-logging-in-tomcat-part2.md @ 0:4cd9b65e10e4

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
initial import of the pelican based blog
author Dirk Olmes <dirk@xanthippe.ping.de>
date Fri, 28 Jun 2013 08:48:58 +0200
parents
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
4cd9b65e10e4 initial import of the pelican based blog
Dirk Olmes <dirk@xanthippe.ping.de>
parents:
diff changeset
1 Title: Log4j based logging in Tomcat 6 - Part 2
4cd9b65e10e4 initial import of the pelican based blog
Dirk Olmes <dirk@xanthippe.ping.de>
parents:
diff changeset
2 Date: 2008-06-15
4cd9b65e10e4 initial import of the pelican based blog
Dirk Olmes <dirk@xanthippe.ping.de>
parents:
diff changeset
3 Tags: logging, log4j, Tomcat
4cd9b65e10e4 initial import of the pelican based blog
Dirk Olmes <dirk@xanthippe.ping.de>
parents:
diff changeset
4 Lang: en
4cd9b65e10e4 initial import of the pelican based blog
Dirk Olmes <dirk@xanthippe.ping.de>
parents:
diff changeset
5
4cd9b65e10e4 initial import of the pelican based blog
Dirk Olmes <dirk@xanthippe.ping.de>
parents:
diff changeset
6 In my [previous experiment](|filename|./log4j-based-logging-in-tomcat-part1.md) I got Tomcat to log through commons-logging by following the Tomcat instructions.
4cd9b65e10e4 initial import of the pelican based blog
Dirk Olmes <dirk@xanthippe.ping.de>
parents:
diff changeset
7
4cd9b65e10e4 initial import of the pelican based blog
Dirk Olmes <dirk@xanthippe.ping.de>
parents:
diff changeset
8 While this works well for webapps that use commons-logging or log4j directly, webapps using JDK logging (e.g. [Hudson](http://hudson.dev.java.net/)) still clutter catalina.out. I remembered an approach that Holger was researching earlier: replace the standard JDK logging that comes preconfigured with Tomcat with a logger that pipes everything through [slf4j](http://www.slf4j.org/).
4cd9b65e10e4 initial import of the pelican based blog
Dirk Olmes <dirk@xanthippe.ping.de>
parents:
diff changeset
9
4cd9b65e10e4 initial import of the pelican based blog
Dirk Olmes <dirk@xanthippe.ping.de>
parents:
diff changeset
10 Holger's comment on the earlier blog post got me curious and I sat down and re-did his solution, this time using slf4j's JCL bridge. The net effect is that all logging in Tomcat is done through slf4j (and thus through log4j). The only log messages that show up in catalina.out are those printed to System.out by the webapps but I think that's negligible.
4cd9b65e10e4 initial import of the pelican based blog
Dirk Olmes <dirk@xanthippe.ping.de>
parents:
diff changeset
11
4cd9b65e10e4 initial import of the pelican based blog
Dirk Olmes <dirk@xanthippe.ping.de>
parents:
diff changeset
12 Just do the following easy steps to apply the logging Judo to Tomcat:
4cd9b65e10e4 initial import of the pelican based blog
Dirk Olmes <dirk@xanthippe.ping.de>
parents:
diff changeset
13
4cd9b65e10e4 initial import of the pelican based blog
Dirk Olmes <dirk@xanthippe.ping.de>
parents:
diff changeset
14 1. In your Tomcat install dir, create a new folder named ext to hold additional jars.
4cd9b65e10e4 initial import of the pelican based blog
Dirk Olmes <dirk@xanthippe.ping.de>
parents:
diff changeset
15 1. copy `jul-to-slf4j.jar`, `slf4j-api.jar`, `slf4j-log4j12.jar` and `log4j.jar` to the new ext folder
4cd9b65e10e4 initial import of the pelican based blog
Dirk Olmes <dirk@xanthippe.ping.de>
parents:
diff changeset
16 1. also put a `log4j.properties` into the ext folder
4cd9b65e10e4 initial import of the pelican based blog
Dirk Olmes <dirk@xanthippe.ping.de>
parents:
diff changeset
17 1. replace Tomcat's `logging.properties` with a file that contains the following:<br>
4cd9b65e10e4 initial import of the pelican based blog
Dirk Olmes <dirk@xanthippe.ping.de>
parents:
diff changeset
18 handlers= org.slf4j.bridge.SLF4JBridgeHandler<br>
4cd9b65e10e4 initial import of the pelican based blog
Dirk Olmes <dirk@xanthippe.ping.de>
parents:
diff changeset
19 .level= INFO
4cd9b65e10e4 initial import of the pelican based blog
Dirk Olmes <dirk@xanthippe.ping.de>
parents:
diff changeset
20 1. patch `catalina.sh` to have the `ext` folder and all its jars on the CLASSPATH.
4cd9b65e10e4 initial import of the pelican based blog
Dirk Olmes <dirk@xanthippe.ping.de>
parents:
diff changeset
21 1. restart tomcat et voilà ... no more logging to catalina.out