environment specific log4j configuration by spring

[adeelmahmood]

I am loading log4j.xml using the traditional way

<context-param>
        <param-name>log4jConfigLocation</param-name>
        <param-value>classpath:conf/log4j.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
    </listener>

This works fine but now I need to load a different log4j.xml file based on which environment I am in which is defined by a environment variable/jndi entry .. so I was hoping that with new spring 3.1 property management I could just change this to

<context-param>
        <param-name>log4jConfigLocation</param-name>
        <param-value>classpath:conf/log4j-${WASENV}.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
    </listener>

and spring will load the correct log4j file in each environment but this doesnt works probably because web.xml is loaded before spring. I came across this method

<!-- log4j setting -->
    <bean id="log4jInitialization"
 class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
  <property name="targetClass"
   value="org.springframework.util.Log4jConfigurer" />
  <property name="targetMethod" value="initLogging" />
  <property name="arguments">
   <list>
    <value>log4j-${WASENV}.xml</value>
   </list>
  </property>
 </bean>

so essentially moving configuration of log4j into spring context file instead of web.xml. Is there a cleaner way to do this.

Any help would be appreciated.
Thanks
Adeel

[adeelmahmood]

may be I can ask the question in a different way. What is the preferred method of log4j configuration using spring with environment specific log4j properties in mind.