Copernik.eu Log4j2 plugins is a loose set of plugins for the Log4j2 Core logging system.
The log4j-tomcat artifact contains an alternative WebappClassloader that allows a web application to use a common
version of the Log4j2 API if it is available on the Tomcat server. To use it:
- add
log4j-tomcatto your application, - add a
META-INF/context.xmlfile (cf. defining a context with content:
<Context>
<Loader loaderClass="eu.copernik.log4j.tomcat.Log4jWebappClassLoader"/>
</Context>
The artifact contains also a "${tomcat:...}" lookup that resolves all the classloader.* properties available in
Tomcat JULI.
| Placeholder | Value |
|---|---|
| ${tomcat:catalina.engine.name} ${tomcat:classloader.serviceName} |
The name of the Tomcat's Engine container (e.g. "Catalina") |
| ${tomcat:catalina.engine.logger} | The logger name used by Tomcat's engine |
| ${tomcat:catalina.host.name} ${tomcat:classloader.hostName} |
The name of the Tomcat's Host container (e.g. "localhost") |
| ${tomcat:catalina.host.logger} | The logger name used by Tomcat's host |
| ${tomcat:catalina.context.name} ${tomcat:classloader.webappName} |
The name of the Tomcat's Context container |
| ${tomcat:catalina.context.logger} | The logger name used by Tomcat's context (e.g. by ServletContext#log) |
This allows to write a single Log4j2 configuration for all deployed application, e.g.:
<Configuration name="Default">
<Appenders>
<File name="FILE"
fileName="${sys:catalina.base}/logs/${tomcat:catalina.engine.name}/${tomcat:catalina.host.name}/${tomcat:catalina.context.name}.log"/>
</Appenders>
<Loggers>
<Root level="INFO">
<AppenderRef ref="FILE"/>
</Root>
</Loggers>
</Configuration>
Copernik.eu Log4j2 plugins is distributed under the Apache License, version 2.0.