Liferay diaries: Log4j

Setting up log4j for a Liferay and Spring application is easy:
in /WEB-INF/log4j.properties

log4j.category.org.springframework=DEBUG,console

And some entries in web.xml

<context-param>
 <param-name>log4jConfigLocation</param-name>
 <param-value>/WEB-INF/log4j.properties</param-value>
</context-param>
<listener>
 <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>