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Overview

With the Log4jConfigurationLoaderListener you can define a Key for your web-application where the log4j.xml can be configured.

Example

Example Application exists in: https://sourceforge.net/p/settings4j/code/HEAD/tree/example/example-log4jConfigurationWebXml/trunk.

Example Usage

The example Configuration looks like the following:

web.xml

 <context-param>
     <param-name>settings4jLog4jConfigurationKey</param-name>
     <param-value>com/myCompany/myApp/log4j.configuration</param-value>
 </context-param>
 
 <listener>
     <display-name></display-name>
     <listener-class>org.settings4j.helper.web.Log4jConfigurationLoaderListener</listener-class>
 </listener>

Example With Default Configuration

You can combine this with Default configuration: web.xml

 <context-param>
     <param-name>settings4jDefaultProperties</param-name>
     <param-value>
         com/myCompany/myApp/log4j.configuration=com/myCompany/myApp/log4j.xml
     </param-value>
 </context-param>

 <context-param>
     <param-name>settings4jLog4jConfigurationKey</param-name>
     <param-value>com/myCompany/myApp/log4j.configuration</param-value>
 </context-param>
 
 <listener>
     <display-name></display-name>
     <listener-class>org.settings4j.helper.web.Log4jConfigurationLoaderListener</listener-class>
 </listener>

Example Server Configuration

Assuming that you have three Applications in your Servlet container deployed.
With Keys for Log4j e.g.:
"com/myCompany/myApp1/log4j.configuration"
"com/myCompany/myApp2/log4j.configuration"
"com/myCompany/myApp3/log4j.configuration"

you can now start you servlet container with System parameters:

        -Dcom/myCompany/myApp1/log4j.configuration=file:/config/log4j-app1.xml 
        -Dcom/myCompany/myApp2/log4j.configuration=file:/config/log4j-app2.xml 
        -Dcom/myCompany/myApp3/log4j.configuration=file:/config/log4j-app3.xml

And each Application can have its own log4j configuration.

Also configuration per Preferences and JNDI-Context works out of the box.